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1
Dane, Şenol, and Mehmet Bayirli. "Correlations between Hand Preference and Durations of Hearing for Right and Left Ears in Young Healthy Subjects." Perceptual and Motor Skills 86, no. 2 (1998): 667–72. http://dx.doi.org/10.2466/pms.1998.86.2.667.
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In this study, to test an inference from the 1991 Previc hypothesis that right-handers have a right-ear advantage, the durations of hearing for the right and left ears were compared for 81 right- and 45 left-handed high school students. In the present study, right-handedness was associated with a right-ear advantage and left-handedness was associated with a left-ear advantage. In addition, there was a significant positive correlation between the durations of hearing for the right and left ears and the scores for right-handedness for right-handed subjects. The durations of hearing for the right and left ears were negatively correlated with the left-handedness for left-handed subjects. These results suggest hand preference may be related to asymmetry of aural sensitivity.
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Rahman, Md Shamsur, Zubaida Gulshan Ara, Anjuman Ara, et al. "Correlation of Handedness with Hand Shape Index in Right Hander and Left Hander Medical Students of Bangladesh." Community Based Medical Journal 11, no. 1 (2022): 14–20. http://dx.doi.org/10.3329/cbmj.v11i1.60263.
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This cross-sectional, analytical type of study was performed in Department of Anatomy, Dhaka Medical College, Bangladesh, from July 2016 to June 2017 on 52 right hander male and 52 right hander female, 40 left hander male and 34 left hander female Bangladeshi medical students. Convenient purposive sampling technique was adopted. History of any injury of upper limb was excluded to construct standard measurement. Handedness of each medical student was determined by the Edinburgh handedness inventory. Hand breadth and hand length was measured with the help of vernier caliper. Paired and unpaired student‟s „t‟ test and Pearson‟s correlation coefficient test were done for statistical analyses. Handedness score showed nonsignificant positive correlation with right hand shape index (r = +0.087, P>0.05) and left-hand shape index (r = +0.008, P>0.05) in right hander males. Handedness score showed non-significant negative correlation with right hand shape index (r = -0.017, P>0.05) and left-hand shape index (r = -0.003, P>0.05) in right hander females. Handedness score showed non-significant negative correlation with right hand shape index (r= - 0.210, P>0.05) and left-hand shape index (r = -0.247, P>0.05) in left hander males. Handedness score showed non-significant positive correlation with right hand shape index (r= +0.051, P>0.05) and left-hand shape index (r = +0.213, P>0.05) in left hander females. To summarize, handedness score showed nonsignificant positive correlation with right hand shape index and left-hand shape index in right hander males and left hander females. However, handedness score showed non-significant negative correlation with right hand shape index and left-hand shape index in right hander females and left hander males.
CBMJ 2022 January: vol. 11 no. 01 P: 14-20
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Hashimoto, Takashi. "Molecular genetic analysis of left–right handedness in plants." Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences 357, no. 1422 (2002): 799–808. http://dx.doi.org/10.1098/rstb.2002.1088.
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Handedness in plant growth may be most familiar to us when we think of tendrils or twining plants, which generally form consistent right– or left–handed helices as they climb. The petals of several species are sometimes arranged like fan blades that twist in the same direction. Another less conspicuous example is ‘circumnutation’, the oscillating growth of axial organs, which alternates between a clockwise and an anti–clockwise direction. To unravel molecular components and cellular determinants of handedness, we screened Arabidopsis thaliana seedlings for helical growth mutants with fixed handedness. Recessive spiral1 and spiral2 mutants show right–handed helical growth in roots, hypocotyls, petioles and petals; semi–dominant lefty1 and lefty2 mutants show opposite left–handed growth in these organs. lefty mutations are epistatic to spiral mutations. Arabidopsis helical growth mutants with fixed handedness may be impaired in certain aspects of cortical microtubule functions, and characterization of the mutated genes should lead us to a better understanding of how microtubules function in left–right handedness in plants.
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Fritsche, Sarah A., and Annukka K. Lindell. "ON THE OTHER HAND: THE COSTS AND BENEFITS OF LEFT-HANDEDNESS." Acta Neuropsychologica 17, no. 1 (2019): 69–86. http://dx.doi.org/10.5604/01.3001.0013.1689.
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Left-handers have been persecuted by right-handers for millennia. This right bias is evident cross-culturally, linguistically (right is literally and figuratively ‘right’, with lefties being described as ‘gauche’, ‘sinister’ and ‘cack-handed’), and environmentally (e.g., equipment design, including power tools, ticket machines, and lecture-room desks). Despite this, the proportion of left-handers has remained constant at approximately 10% of the hominid population, implying that though there are costs associated with left-handedness (if there were not, the proportions of left- and right-handers would be 50:50), left handers must also enjoy fitness advantages that maintain the genes for left-handedness in the population. This paper reviews the costs and benefits of being left-handed, exploring research examining the effects of handedness on brain structure, cognitive function, and human behaviour. The research confirms a variety of left-hander advantages, including some cognitive superiorities, higher wages, and greater sporting and fighting prowess. On the other hand, left-handedness is also associated with significant fitness costs, including an increased risk of accidents, higher substance abuse susceptibility, and earlier death, in comparison with right-handers. In sum, left-handedness confers both costs and benefits, with the latter outweighing the former, maintaining the genes for left-handedness in the population.
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Rodway, Paul, Curtis Rodway, and Astrid Schepman. "Exploring Footedness, Throwing Arm, and Handedness as Predictors of Eyedness Using Cluster Analysis and Machine Learning: Implications for the Origins of Behavioural Asymmetries." Symmetry 16, no. 2 (2024): 177. http://dx.doi.org/10.3390/sym16020177.
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Behavioural asymmetries displayed by individuals, such as hand preference and foot preference, tend to be lateralized in the same direction (left or right). This may be because their co-ordination conveys functional benefits for a variety of motor behaviours. To explore the potential functional relationship between key motor asymmetries, we examined whether footedness, handedness, or throwing arm was the strongest predictor of eyedness. Behavioural asymmetries were measured by self-report in 578 left-handed and 612 right-handed individuals. Cluster analysis of the asymmetries revealed four handedness groups: consistent right-handers, left-eyed right-handers, consistent left-handers, and inconsistent left-handers (who were left-handed but right-lateralized for footedness, throwing and eyedness). Supervised machine learning models showed the importance of footedness, in addition to handedness, in determining eyedness. In right-handers, handedness was the best predictor of eyedness, followed closely by footedness, and for left-handers it was footedness. Overall, predictors were more informative in predicting eyedness for individuals with consistent lateral preferences. Implications of the findings in relation to the origins and genetics of handedness and sports training are discussed. Findings are related to fighting theories of handedness and to bipedalism, which evolved after manual dexterity, and which may have led to some humans being right-lateralized for ballistic movements and left-lateralized for hand dexterity.
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Milenkovic, Sanja, Goran Belojevic, Katarina Paunovic, and Dragana Davidovic. "Historical aspects of left-handedness." Srpski arhiv za celokupno lekarstvo 147, no. 11-12 (2019): 782–85. http://dx.doi.org/10.2298/sarh190522095m.
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Lateralization is one of the central questions in neurology, neuropsychology, and other related scientific disciplines. There has been very little change in the proportion of left-handers since the Upper Paleolithic Age about 10,000 years ago and it is estimated to be around 10%. As the history of human thinking has developed from superstition to science, the explanation of left-handedness transformed from ?devil?s work? to neurological specificity. This paper presents this very interesting historical change by analyzing the data on left-handedness and the attitudes towards it in human societies from prehistory to today. Even in a relatively open-minded society, parents and teachers may encourage a left-handed child to switch to right-handedness to make their lives easier in a largely right-handed world. On the other hand, left-handedness is increasingly seen as a special gift, and left-handed people have started to favor themselves as more competent in relation to the right-handed people.
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Gut, Malgorzata, Andrzej Urbanik, Lars Forsberg, et al. "Brain correlates of right-handedness." Acta Neurobiologiae Experimentalis 67, no. 1 (2007): 43–51. http://dx.doi.org/10.55782/ane-2007-1631.
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Recent development of neuroimaging techniques has opened new possibilities for the study of the relation between handedness and the brain functional architecture. Here we report fMRI measurements of dominant and non-dominant hand movement representation in 12 right-handed subjects using block design. We measured possible asymmetry in the total volume of activated neural tissue in the two hemispheres during simple and complex finger movements performed either with the right hand or with the left hand. Simple movements consisted in contraction/extension of the index finger and complex movements in successive finger-thumb opposition from little finger to index finger. A general predominance of left-hemisphere activation relative to right hemisphere activation was found. Increasing the complexity of the motor activity resulted in an enlargement of the volume of consistently activated areas and greater involvement of ipsilateral areas, especially in the left hemisphere. Movements of the dominant hand elicited large contralateral activation (larger than movements of the non-dominant hand) and relatively smaller ipsilateral activation. Movements of the non-dominant hand resulted in a more balanced pattern of activation in the two hemispheres, due to relatively greater ipsilateral activation. This suggests that the dominant (right) hand is controlled mainly by the contralateral (left) hemisphere, whereas the nondominant hand is controlled by both left and right hemispheres. This effect is especially apparent during execution of complex movements. The expansion of brain areas involved in motor control in the hemisphere contralateral to the dominant hand may provide neural substrate for higher efficiency and a greater motor skill repertoire of the preferred hand. Correspondence should be addressed to M.Gut, Email: m.gut@nencki.gov.pl
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Nakada, Tsutomu, Yukihiko Fujii, and Ingrid L. Kwee. "Coerced training of the nondominant hand resulting in cortical reorganization: a high-field functional magnetic resonance imaging study." Journal of Neurosurgery 101, no. 2 (2004): 310–13. http://dx.doi.org/10.3171/jns.2004.101.2.0310.
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Object. The authors investigated brain strategies associated with hand use in an attempt to clarify genetic and nongenetic factors influencing handedness by using high-field functional magnetic resonance imaging. Methods. Three groups of patients were studied. The first two groups comprised individuals in whom handedness developed spontaneously (right-handed and left-handed groups). The third group comprised individuals who were coercively trained to use the right hand and developed mixed handedness, referred to here as trained ambidexterity. All trained ambidextrous volunteers were certain that they were innately left-handed, but due to social pressure had modified their preferred hand use for certain tasks common to the right hand. Although right-handed and left-handed volunteers displayed virtually identical cortical activation, involving homologous cortex primarily located contralateral to the hand motion, trained ambidextrous volunteers exhibited a clearly unique activation pattern. During right-handed motion, motor areas in both hemispheres were activated in these volunteers. During left-handed motion, the right supplemental motor area and the right intermediate zone of the anterior cerebellar lobe were activated significantly more frequently than observed in naturally right-handed or left-handed volunteers. Conclusions. The results provide strong evidence that cortical organization of spontaneously developed right- and left-handedness involves homologous cortex primarily located contralateral to the hand motion, and this organization is likely to be prenatally determined. By contrast, coerced training of the nondominant hand during the early stages of an individual's development results in mixed handedness (trained ambidexterity), indicating cortical reorganization.
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Milenkovic, Sanja, Goran Belojevic, and Radojka Kocijancic. "Aetiological factors in left-handedness." Srpski arhiv za celokupno lekarstvo 133, no. 11-12 (2005): 532–34. http://dx.doi.org/10.2298/sarh0512532m.
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Lateralisation associates the extremities and senses of one side of the body, which are connected by afferent and efferent pathways, with the primary motor and sensory areas of the hemisphere on the opposite side. Dominant laterality denotes the appearance of a dominant extremity or sense in the performance of complex psychomotor activities. Laterality is manifested both as right-handedness or left-handedness, which are functionally equivalent and symmetrical in the performance of activities. Right-handedness is significantly more common than left-handedness. Genetic theory is most widely accepted in explaining the onset of lateralisation. According to this theory, the models of brain organisation asymmetry (anatomical, functional, and biochemical) are strongly, genetically determined. However, the inability to clearly demonstrate the association between genetic factors and left-handedness has led researchers to investigate the effects of the environment on left-handedness. Of particular interest are the intrauterine environment and the factors influencing foetal development, of which hormones and ultrasound exposure are the most significant. It has been estimated that an extra five cases of nonright-handed lateralisation can be expected in every 100 males who were exposed to ultrasound in utero compared to those who were not. Socio-cultural pressure on left-handed individuals was much more severe in the past, which is confirmed by scientific findings that left-handedness is present in 13% of individuals in their twenties, while in less than 1% of individuals in their eighties.
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Marrion, Leslie V., and Lorne K. Rosenblood. "Handedness in the Kwakiutl Totem Poles: An Exception to 50 Centuries of Right-Handedness." Perceptual and Motor Skills 62, no. 3 (1986): 755–59. http://dx.doi.org/10.2466/pms.1986.62.3.755.
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A survey of handedness in Kwakiutl Indian totem and house poles found 56% bihandedness, 24% left-handedness, and 20% right-handedness. These findings are in marked contrast to other research findings on artforms, which show about 90% right-handedness. In the previous studies no systematic variation in the incidence of right-handedness was found across time eras, cultures, or geographic location. This apparent consistency was interpreted as supporting an hypothesis that right-handedness is universal and physiological. However, the present authors' findings with regard to Kwakiutl handedness clearly refutes the notion of universal right-handedness in artforms. In the current Kwakiutl population, there is a strong indication that sociocultural and environmental factors may also strongly influence the expression of handedness.
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Brown, N. A., and L. Wolpert. "The development of handedness in left/right asymmetry." Development 109, no. 1 (1990): 1–9. http://dx.doi.org/10.1242/dev.109.1.1.
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The development of handed asymmetry requires a special mechanism for consistently specifying a difference between left and right sides. This is to be distinguished from both random asymmetry, and from those left/right differences that are mirror symmetrical. We propose a model for the development of handedness in bilateral animals, comprising three components. (i) A process termed conversion, in which a molecular handedness is converted into handedness at the cellular level. A specific model for this process is put forward, based on cell polarity and transport of cellular constituents by a handed molecule. (ii) A mechanism for random generation of asymmetry, which could involve a reaction-diffusion process, so that the concentration of a molecule is higher on one side than the other. The handedness generated by conversion could consistently bias this mechanism to one side. (iii) A tissue-specific interpretation process which responds to the difference between the two sides, and results in the development of different structures on the left and right. There could be direct genetic control of the direction of handedness in this model, most probably through the conversion process. Experimental evidence for the model is considered, particularly the iv mutation in the mouse, which appears to result in loss-of-function in biasing, and so asymmetry is random. The model can explain the abnormal development of handedness observed in bisected embryos of some mammalian, amphibian and sub-vertebrate species. Spiral asymmetry, as seen in spiral cleavage and in ciliates, involves only conversion of molecular asymmetry to the cellular and multicellular level, with no separate interpretation step.
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Takahashi, H., N. Yahata, M. Matsuura, et al. "Neural Responses to Human Voice and Hemisphere Dominance for Lexical-semantic Processing." Methods of Information in Medicine 46, no. 02 (2007): 247–50. http://dx.doi.org/10.1055/s-0038-1625416.
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Summary Objectives : In our previous functional magnetic resonance imaging (fMRI) study, we determined that there was distinct left hemispheric dominance for lexical- semantic processing without the influence of human voice perception in right-handed healthy subjects. However, the degree of right-handedness in the right-handed subjects ranged from 52 to 100 according to the Edinburgh Handedness Inventory (EHI) score. In the present study, we aimed to clarify the correlation between the degree of right-handedness and language dominance in the fronto-temporo-parietal cortices by examining cerebral activation for lexical-semantic processing. Methods : Twenty-seven normal right-handed healthy subjects were scanned by fMRI while listening to sentences (SEN), reverse sentences (rSEN), and identifiable non-vocal sounds (SND). Fronto-temporo-parietal activation was observed in the left hemisphere under the SEN - rSEN contrast, which included lexical- semantic processing without the influence of human voice perception. Laterality Indexwas calculated as LI = (L - R)/(L + R) X 100, L: left, R: right. Results : Laterality Index in the fronto-temporo-parietal cortices did not correlate with the degree of right-handedness in EHI score. Conclusions : The present study indicated that the degree of right-handedness from 52 to 100 in EHI score had no effect on the degree of left hemispheric dominance for lexical-semantic processing in right-handed healthy subjects.
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Heikkilä, Kauko, Catharina E. M. Van Beijsterveldt, Jari Haukka, et al. "Triplets, birthweight, and handedness." Proceedings of the National Academy of Sciences 115, no. 23 (2018): 6076–81. http://dx.doi.org/10.1073/pnas.1719567115.
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The mechanisms behind handedness formation in humans are still poorly understood. Very low birthweight is associated with higher odds of left-handedness, but whether this is due to low birthweight itself or premature birth is unknown. Handedness has also been linked to development, but the role of birthweight behind this association is unclear. Knowing that birthweight is lower in multiple births, triplets being about 1.5 kg lighter in comparison with singletons, and that multiples have a higher prevalence of left-handedness than singletons, we studied the association between birthweight and handedness in two large samples consisting exclusively of triplets from Japan (n = 1,305) and the Netherlands (n = 947). In both samples, left-handers had significantly lower birthweight (Japanese mean = 1,599 g [95% confidence interval (CI): 1,526–1,672 g]; Dutch mean = 1,794 g [95% CI: 1,709–1,879 g]) compared with right-handers (Japanese mean = 1,727 g [95% CI: 1,699–1,755 g]; Dutch mean = 1,903 g [95% CI: 1,867–1,938 g]). Within-family and between-family analyses both suggested that left-handedness is associated with lower birthweight, also when fully controlling for gestational age. Left-handers also had significantly delayed motor development and smaller infant head circumference compared with right-handers, but these associations diluted and became nonsignificant when controlling for birthweight. Our study in triplets provides evidence for the link between low birthweight and left-handedness. Our results also suggest that developmental differences between left- and right-handers are due to a shared etiology associated with low birthweight.
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Cathenis, K., J. Fleerakkers, W. Willaert, P. Ballaux, D. Goossens, and R. Hamerlijnck. "Left-handedness in cardiac surgery: who’s right?" Acta Chirurgica Belgica 120, no. 3 (2019): 212–16. http://dx.doi.org/10.1080/00015458.2019.1642599.
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Nagels, G., P. Marien, L. Timmermans, B. A. Pickut, and P. P. De Deyn. "Actigraphic measurement of left and right handedness." Electroencephalography and Clinical Neurophysiology 95, no. 5 (1995): P111—P112. http://dx.doi.org/10.1016/0013-4694(95)92422-v.
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Mouloua, Salim A., Mustapha Mouloua, Daniel S. McConnell, and P. A. Hancock. "The Effects of Handedness and Dominance on Motor Task Performance." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 62, no. 1 (2018): 1237–41. http://dx.doi.org/10.1177/1541931218621284.
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Two studies were carried out to examine the effects of user handedness and hand dominance on a motor task using Fitts’ law. Study one was designed to validate our previous findings showing differences between left- and right-handed participants who completed a mouse-pointing task using Fitts’ law. Results showed that right-handed participants were significantly faster than their left-handed peers, thereby validating our previous findings. Study two examined the effect of handedness and hand dominance on motor task performance by requiring two groups of left- and right-handed participants perform the motor task using both their dominant and non-dominant hands. Results showed a significant interaction between handedness and hand dominance on task performance. Right-handed participants were again significantly faster than their left-handed peers when both groups were using their dominant hand. However, left-handed participants were significantly faster than their right-handed peers when both groups were using their non-dominant hand. These findings might be attributed to prior training with computer mice designs that do not account for user handedness. Both theoretical and practical implications, as well as directions for future studies are also discussed.
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Dane, Şenol, Murat Karaşen, Önder Şahin, and Emre Öztop. "Lateralization of Squamous Cell Carcinomas in the Head-Neck Region." Perceptual and Motor Skills 100, no. 1 (2005): 258–62. http://dx.doi.org/10.2466/pms.100.1.258-262.
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Earlier studies have shown the lateralization of several immune disorders, including herpes zoster infection and breast cancer. We investigated whether there is lateralization of squamous cell carcinomas in the head-neck region and a relation of handedness with this cancer. Analysis showed right-sided lateralization of head-heck cancers in right-handed patients and vice versa in left-handed ones and a higher rate of left-handedness in patients with squamous cell cancer. Associations among left-handedness, squamous cell carcinoma, and its lateralization may result from a genetic togetherness.
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Nosten, M., P. Roubertoux, H. Degrelle, and M. Leboyer. "EFFECT OF THE TFM MUTATION ON HANDEDNESS IN MICE." Journal of Endocrinology 121, no. 1 (1989): R5—R7. http://dx.doi.org/10.1677/joe.0.121r005.
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ABSTRACT The hyposthesis has been proposed that testosterone is involved in the determination of handedness in man: a high sensitivity to testosterone being associated with left handedness. Handedness in mice is tested according to Collins' paradigm: most mice present either a right or a left paw preference but others are ambilateral. The hypothesis that there is an association between a low neonatal imprinting by testosterone and a strong handedness (right or left) is tested here using Tfm male mice which are testosterone insensitive. Our results confirmed the hypothesis, since Tfm males were as well lateralized as their female siblings and significantly more strongly lateralized than their male siblings not carrying the mutation.
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Dragovic, Milan, Sanja Milenkovic, Dusica Kocijancic, and Zlatko Sram. "Etiological aspect of left-handedness in adolescents." Srpski arhiv za celokupno lekarstvo 141, no. 5-6 (2013): 354–58. http://dx.doi.org/10.2298/sarh1306354d.
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Introduction. Lateralization of brain functions such as language and manual dominance (hand preferences and fine motor control) are most likely under genetic control. However, this does not preclude the effect of various environmental factors on functional brain lateralization. A strong association of non-right-handedness (left- and mixed-handedness) with various neurodevelopmental conditions (e.g. schizophrenia, autism, Rett syndrome) implies that in some cases, non-right-handedness may be acquired rather than inherited (i.e., pathologically determined). Objective. The aim of the study was: (a) re-investigation of several known risk factors for left-handedness (age of mother and/or father, twin pregnancies, and birth order), and (b) examination of hitherto uninvestigated factors (type of birth, Apgar score, maternal smoking during pregnancy). Methods. Putative, causative environmental agents for this shift in manual distributions are explored in a sample of 1031 high school students (404 males and 627 females) from Belgrade. Both pre-existing (age of parents, twin pregnancy, and birth order) and new (Apgar score, maternal smoking, type of birth) putative agents are examined. Results. We found that maternal smoking and low Apgar score (2-6) can significantly increase risk for left-handedness (p=0.046 and p=0.042, respectively). The remaining factors showed no significant association with left-handedness in adolescents. Conclusion. Our study clearly demonstrates that left-handedness may be related to maternal smoking during pregnancy and a low Apgar score on birth.
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Safer, Abraham N., Peter Homel, and David D. Chung. "Lateral comparisons using Fishman's skeletal maturation assessment." Angle Orthodontist 85, no. 3 (2014): 408–12. http://dx.doi.org/10.2319/043014-312.1.
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ABSTRACT Objective: To assess lateral differences between ossification events and stages of bone development in the hands and wrists utilizing Fishman's skeletal maturation indicators (SMIs). Materials and Methods: The skeletal ages of 125 subjects, aged 8 to 20 years, were determined with left and right hand-wrist radiographs using Fishman's SMI assessment. Each subject was also given the Edinburgh Handedness Questionnaire to assess handedness. The skeletal ages of both hand-wrist radiographs were analyzed against each other, handedness, chronologic age, and gender. Results: There were no significant differences overall in right and left SMI scores (P = .70); 79% of all patients showed no difference in right and left SMI scores, regardless of handedness, gender, or age. However, when patients were categorized based on clinical levels of SMI score for the right hand-wrist, there was a significant difference (P = .01) between the SMI 1-3 group and the SMI 11 group. Subjects in the SMI 1-3 group were more likely to show a left > right SMI score, while subjects in the SMI 11 group were likely to show a right > left SMI score. Conclusion: Although no significant overall lateral differences in SMI scores were noted, it may be advisable to obtain a left hand-wrist radiograph and/or additional diagnostic information to estimate completion of growth in young surgical patients.
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Fagard, Jacqueline, Maria De Agostini, Viviane Huet, Lionel Granjon, and Barbara Heude. "Is Handedness at Five Associated with Prenatal Factors?" International Journal of Environmental Research and Public Health 18, no. 7 (2021): 3529. http://dx.doi.org/10.3390/ijerph18073529.
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The goal of the study was to investigate some of the factors suspected to be related to children’s handedness: presentation during the last weeks of gestation and at birth (cephalic or breech), side of presentation (right or left), number of weeks of gestation, season of birth, parents’ handedness and sex. We analyzed the relationships between these factors and the child’s handedness at five years. Children (n = 1897) from the EDEN cohort participated in the study, among which 1129 were tested for handedness at five. The father’s handedness, but not the mother’s, was significantly related to the child’s hand preference. The percentage of left-handed children was significantly larger when the father was non-right-handed compared to right-handed, and tended to be larger among children in non-left-cephalic presentation compared to left-cephalic presentation. Girls, but not boys, were significantly less lateralized when they were born before 37 weeks of pregnancy than after. Finally, children born in winter or spring were slightly but significantly less lateralized than children born in summer or autumn. All six children who were not lateralized at 5 presented one or several of these factors. These results are discussed in light of the mixed model of handedness.
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Rueda, I., I. Banegas, I. Prieto, et al. "Handedness and gender influence blood pressure in young healthy men and women: A pilot study." Endocrine Regulations 50, no. 1 (2016): 10–15. http://dx.doi.org/10.1515/enr-2016-0003.
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AbstractObjective. The type and level of sex steroids influence blood pressure (BP). It has been suggested that functional brain asymmetries may be influenced by sex hormones. In addition, there are inter-arm differences in BP not yet related with handedness. In this study, we hypothesize a possible association between sex hormones, handedness, and inter-arm differences in blood pressure.Methods. To analyze this hypothesis, we measured BP in the left and right arm of the left and right handed adult young men and women in menstrual and ovulatory phase and calculated their mean arterial pressure (MAP).Results. Significant differences depending on sex, arm, handedness or phase of the cycle were observed. MAP was mostly higher in men than in women. Remarkably, in women, the highest levels were observed in the left handed in menstrual phase. Interestingly, the level of handedness correlated negatively with MAP measured in the left arm of right-handed women in the ovulatory phase but positively with the MAP measured in the right arm of right-handed women in the menstrual phase.Conclusions. These results may reflect an asymmetrical modulatory influence of sex hormones in BP control.
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Malesu, R. R., M. Cannon, P. B. Jones, et al. "Mixed-Handedness in Patients with Functional Psychosis." British Journal of Psychiatry 168, no. 2 (1996): 234–36. http://dx.doi.org/10.1192/bjp.168.2.234.
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BackgroundAn excess of non-right-handedness has been shown among patients with schizophrenia. However it is not clear whether this finding can be accounted for by an increase in left-handedness, mixed-handedness or both. It is not known whether atypical patterns of hand preferences occur in other functional psychotic illnesses.MethodThe Annett hand preference questionnaire was administered to patients with schizophrenia (n=120); affective psychosis (n=55); schizoaffective psychosis (n=41), and control subjects (n=86). Handedness was classified into three categories: right, mixed and left-handedness.ResultsThe hand preference patterns of patients with functional psychotic illnesses were not significantly different from controls. Patients with schizophrenia showed a non-significant excess of mixed-handedness compared with controls. Patients with schizophrenia and affective psychosis showed a non-significant decrease in left-handedness compared with controls.ConclusionsAlthough our results showed a trend in the hypothesised direction, we failed to demonstrate that patients with psychotic illness differed from controls on self-reported hand preference patterns.
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Nurhayu, Winati, Bobby Permana Putra, Gres Maretta, Jeane Siswitasari Mulyana, and Andy Darmawan. "Influence of Handedness Preference on Visuospatial Ability in Lampung Province." Jurnal Penelitian Pendidikan IPA 9, no. 5 (2023): 2478–82. http://dx.doi.org/10.29303/jppipa.v9i5.2394.
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The preference for using the right or left hand for different uni-manual tasks is known as handedness. Handedness as functional asymmetry has a correlation with the asymmetric brain. Most types of tools have been developed for right-handed use, leading to different adaptations between left-handed and right-handed individuals. Visuospatial, as one of the cognitive processes, is the ability to visualize two- and or three-dimensional objects. This function allows individuals to remember, plan for the future, navigate, and make decisions, thus visuospatial is one of the primary mental aspects in humans. The aim of this study was to assess whether being left-handed was associated with visuospatial ability. Respondents in this study were 148 adult individuals who lived in Lampung Province. Handedness was assessed based on a questionnaire of self-confessed and hand preference of 10 daily activities. Hand grip performance was measured by using a hand dynamometer. The ability of visuospatial was assessed by using the Right-Left Discrimination method. The results of the visuospatial ability test showed that left-handed individuals had a better average score of visuospatial than right-handed ones (44.00 > 40.86). Males had better visuospatial ability than females (estimate = -0.0768; p-value: 0.0481). The influence of handedness on visuospatial ability was discussed
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Martin, Benjamin E. "Differences in proportional claw size among left- and right-handed Atlantic sand fiddler crabs Leptuca pugilator (Bosc, 1801) (Decapoda: Brachyura: Ocypodidae)." Journal of Crustacean Biology 39, no. 6 (2019): 720–23. http://dx.doi.org/10.1093/jcbiol/ruz067.
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Abstract The sexually dimorphic, enlarged major claw is a prominent feature among fiddler crabs and acts as both a sexual signal and weapon. Most often the enlarged claw occurs on the left and right sides of fiddler crabs in relatively even proportions (40–60%), but populations exhibit an extreme right handedness bias (> 90%) in a few cases. The mechanisms maintaining relatively even handedness proportions among fiddler crabs remains debatable, but from an evolutionary perspective it should be maintained through an evenness in fitness (reproduction and survival) between left- and right-handed crabs. I investigated handedness ratios and claw to body size in a Leptuca pugilator (Bosc, 1801) population on Sapelo Island, Georgia, USA. In collecting 417 adult male crabs, there was a slight right-hand bias (54%, χ 2= 2.9376, P = 0.087), which was similar to the previous study of this population 17 years prior. I nevertheless found right-handed crabs had significantly smaller claw size relative to their carapace size (P = 0.018). Overall, this study documents inequality in the body proportions between left- and right-handed L. pugilator within a population operating at a slight right hand-bias. I discuss how my study contributes to previous discussions on handedness bias in fiddler crabs as well as potential mechanisms that control its widespread handedness evenness.
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Oh, Albert K., John B. Mulliken, Richard A. LaBrie, and Gary F. Rogers. "Increased Frequency of Left-Handedness in Patients with Unilateral Coronal Synostosis." Cleft Palate-Craniofacial Journal 46, no. 3 (2009): 237–44. http://dx.doi.org/10.1597/07-232.1.
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Objective: Left-handedness reportedly has been more common in persons with neurological afflictions (e.g., stroke) and malformations (e.g., cleft lip with or without cleft palate) that demonstrate marked unilateral involvement. Coronal synostosis is also more frequently unilateral, affecting the right side more commonly than the left. We sought to compare left-handedness in patients with unilateral coronal synostosis versus healthy controls. Subjects: All patients aged 3 years or older with nonsyndromic unilateral coronal synostosis and healthy controls recruited by pediatricians blinded to the study. Main Outcome Measures: Prospective data obtained for all participants included age, gender, and handedness. In patients with unilateral coronal synostosis, the side of synostosis and age at surgery were documented. Left-handedness in the study and control groups was compared using chi-square analysis. Left-handedness also was analyzed in the study group according to side of fusion. Results: Eighty-six patients with nonsyndromic unilateral coronal synostosis comprised the study group; there were 96 controls. The mean ages of the study (8.8 years) and control groups (9.8 years) were not statistically different (p > .05). There were more girls in the study group (67%) than in the control group (56%), but this difference was not statistically significant (p > .05). Left-handedness was documented in 30.2% of the study group and 11.4% of the control group (p < .005). Left-handedness was twice as common in patients with left versus right unilateral coronal synostosis (44.4% versus 20.4%; p < .05). Conclusions: Left-handedness is nearly three times more common in patients with unilateral coronal synostosis than in controls and four times more likely in patients with left-sided fusion.
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Hicks, Robert A., Karen Pass, Hope Freeman, Jose Bautista, and Crystal Johnson. "Handedness and Accidents with Injury." Perceptual and Motor Skills 77, no. 3_suppl (1993): 1119–22. http://dx.doi.org/10.2466/pms.1993.77.3f.1119.
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As evidence for the hypothesis on the claim of reduced longevity for left-handers, Coren in 1989 reported data which suggested that left-handers were 1.89 times more likely to report injuries which required medical attention. This left-handed group included both left- and mixed-handed individuals. To clarify the results of his study, we repeated in part Coren's study but defined handedness so that groups of right-, mixed-, and left-handed individuals were considered. In contrast to Coren's data, we found that right- and left-handers did not differ significantly in the frequency with which they reported having experienced accidents with injury and that mixed-handers reported being significantly more likely to have had an injury-accident than either right- or left-handers. These data underscore the need to consider mixed-handedness as a separate group in studies of this type.
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Price, A., and R. Eccles. "Is there any relationship between right and left hand dominance and right and left nasal airflow dominance?" Journal of Laryngology & Otology 131, no. 10 (2017): 846–52. http://dx.doi.org/10.1017/s0022215117001475.
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AbstractBackground:Left- or right-handedness is a common human trait, and it has been previously reported that human nasal airflow dominance correlates with hand dominance. Any relationship between hand dominance and nasal airflow dominance would be unusual. This study aimed to measure nasal airflow and look for any relationship to handedness.Methods:The modified Glatzel mirror was used to record the dominant nasal passage at 15-minute intervals over a 6-hour period in 29 healthy participants consisting of 15 left-handers and 14 right-handers.Results:In left-handers, the percentage of time that the left nasal passage was dominant ranged from 0 to 100 per cent. In right-handers, the percentage of time that the right nasal passage was dominant ranged from 4.2 to 95.8 per cent. No correlation between nasal airflow dominance and hand dominance was identified.Conclusion:The results do not support the hypothesis that nasal airflow and handedness are related.
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Raudeberg, Rune, Åsa Hammar, Marco Hirnstein, Charles E. Gaudet, and Grant L. Iverson. "72 Investigating Handedness and Cognitive Functions in People with Severe Mental Disorders." Journal of the International Neuropsychological Society 29, s1 (2023): 856–57. http://dx.doi.org/10.1017/s1355617723010585.
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Objective:Our objective is to investigate whether handedness is associated with performance on verbal and visual neuropsychological tests in people with severe mental disorders. A recent study, applying a continuous scale of hand preference, reports that handedness is not associated with test performance in people with schizophrenia disorders. Conversely, in a recent large meta-analysis where handedness was applied as a dichotomous variable, right-handers had better performance in spatial ability (but not verbal ability) compared to left-handers, irrespective of gender or health status. We hypothesize that a dichotomous classification of handedness will reveal an advantage of right-handedness on tests of visuospatial functions—but not verbal functions—in people with severe mental disorders. We expect that gender will not be associated with the neuropsychological test results.Participants and Methods:Data from a sample of 385 patients with severe mental disorders, mainly within the schizophrenia spectrum, were analyzed. All participants had Norwegian as their first language. Their mean age was 24.8 years (SD=6.2) and 153 (39.7%) were women. Handedness was evaluated by observation of preferred hand in writing and drawing during neuropsychological assessment. Chi-square tests were used to compare proportions of cases with reported frequencies of handedness in the general population and comparable clinical samples. Raw scores on Semantic Fluency and Line Orientation from the Repeatable Battery for the Assessment of Neuropsychological Status (RBANS) were analyzed using Mann-Whitney U tests, and possible effects of gender with two-way ANOVA. Frequencies of low scores were analyzed using frequency analyses.Results:Overall prevalence of left-handers was 10.4% compared to 10.6% in the general population (χ2=.018, p=.893). Observed prevalence for women was 9.2% compared to expected prevalence of 9.5% (χ2=.026, p=.873) and for men 10.7% and 11.6%, respectively (χ2=.039, p=.844). There was a significant difference in Line Orientation scores (Mdright-handers=18, Mdleft-handers=17; U=5268.0, p=.013) but not Semantic Fluency scores (Mdright-handers=17, Mdleft-handers=18.5; U=7568.5, p=.315). Right-handed men had higher scores on Line Orientation but there was no handedness by gender interaction (F(1)=1.69, p=.194). For Semantic Fluency, left-handed men had higher scores and a gender by handedness interaction was found (F(1)=7.21, p=.008). Using scores corresponding to <5th percentile, 15% of left-handers and 8% of right-handers had scores <5th percentile on Line Orientation, as opposed to 15% and 14% on Semantic Fluency.Conclusions:Right-handers had significantly better performance on a test measuring visuospatial function, irrespective of gender. Left-handers had about twice the number of scores in the impaired range (i.e., <5th percentile) compared to right-handers. Left-handed men had better performance on a test of verbal functions, which was unexpected. A recent study reported no right-hand associated advantage on visuospatial tests in people with schizophrenia disorders when measuring handedness on a continuous scale. This suggests that the classification of handedness as either a dichotomous or as a continuous variable is important in studies of handedness and cognitive functions.
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Llaurens, V., M. Raymond, and C. Faurie. "Why are some people left-handed? An evolutionary perspective." Philosophical Transactions of the Royal Society B: Biological Sciences 364, no. 1519 (2008): 881–94. http://dx.doi.org/10.1098/rstb.2008.0235.
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Since prehistoric times, left-handed individuals have been ubiquitous in human populations, exhibiting geographical frequency variations. Evolutionary explanations have been proposed for the persistence of the handedness polymorphism. Left-handedness could be favoured by negative frequency-dependent selection. Data have suggested that left-handedness, as the rare hand preference, could represent an important strategic advantage in fighting interactions. However, the fact that left-handedness occurs at a low frequency indicates that some evolutionary costs could be associated with left-handedness. Overall, the evolutionary dynamics of this polymorphism are not fully understood. Here, we review the abundant literature available regarding the possible mechanisms and consequences of left-handedness. We point out that hand preference is heritable, and report how hand preference is influenced by genetic, hormonal, developmental and cultural factors. We review the available information on potential fitness costs and benefits acting as selective forces on the proportion of left-handers. Thus, evolutionary perspectives on the persistence of this polymorphism in humans are gathered for the first time, highlighting the necessity for an assessment of fitness differences between right- and left-handers.
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Larsson, Matz, Astrid Schepman, and Paul Rodway. "Why Are Most Humans Right-Handed? The Modified Fighting Hypothesis." Symmetry 15, no. 4 (2023): 940. http://dx.doi.org/10.3390/sym15040940.
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Humans show a population-level preference for using the right hand. The fighting hypothesis is an influential theory that suggests that left-handedness persists because its rarity provides a surprise advantage in fighting interactions, and that left-handedness is less frequent because it has a health cost. However, evidence for the health cost of left-handedness is unsubstantiated, leaving the greater frequency of right-handers unexplained. Research indicates that homicide may have been common in early hominins. We propose that the hand used to hold a weapon by early hominins could have influenced the outcome of a fight, due to the location of the heart and aorta. A left-handed unilateral grip exposes the more vulnerable left hemithorax towards an opponent, whereas a right-hand unilateral grip exposes the less vulnerable right hemithorax. Consequently, right-handed early ancestors, with a preference for using the right forelimb in combat, may have had a lower risk of a mortal wound, and a fighting advantage. This would explain their greater frequency. In accordance with the original fighting hypothesis, we also suggest that left-handed fighters have a surprise advantage when they are rare, explaining their persistence. We discuss evidence for the modified fighting hypothesis, its predictions, and ways to test the theory.
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James, William H. "Handedness and Size." Perceptual and Motor Skills 80, no. 3_suppl (1995): 1250. http://dx.doi.org/10.2466/pms.1995.80.3c.1250.
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Since baseball pitchers are selected for height and left-handedness, nothing can validly be inferred about the general population from the fact that left-handed Major League pitchers are shorter than right-handed pitchers.
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Ivancevic, Nikola, Marija Novicic, Vera Miler-Jerkovic, et al. "Does handedness matter? Writing and tracing kinematic analysis in healthy adults." Psihologija 52, no. 4 (2019): 413–35. http://dx.doi.org/10.2298/psi181229014i.
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Writing is a complex skill and it can be affected by many factors. One of the most obvious is handedness. The actual influence of handedness (especially left-handedness, since almost 10% of the population is left-handed) onto writing performance has not been fully studied in previous research. Digitalized kinematic analyses and assessments of writing strategies (i.e., graphic rules and principles) are two approaches to investigating writing characteristics poorly addressed in previous research. The aim of this study was to analyze the effects of handedness onto writing kinematics using the aforementioned approach. The study included 34 young healthy adults (of whom 11 were left-handed) performing three writing tasks on a digital board. The tasks included semicircle and figure tracing and cursive letter writing. Regarding kinematics, left-handers performed tracing movements with higher mean horizontal acceleration and lower mean horizontal jerk compared to right-handed subjects. In addition, the left-handed wrote less accurately (i.e., undershooting more writing borders) and made more pauses during the letter writing task. The obtained results suggest that handedness slightly affects writing performance, and since left- and right-handers use the same cognitive strategies to writing and tracing, the observed differences could be mainly due to biomechanical constraints, what needs further studies in more representative samples.
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Das, Beauty, Jed Meltzer, and Blair Armstrong. "Quantitative Assessment of Handedness and Cerebral Lateralization." UTSC's Journal of Natural Sciences 2, no. 1 (2021): 6–22. http://dx.doi.org/10.33137/jns.v2i1.34660.
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Handedness is the most studied human asymmetry due to its connection to various lateralized behaviours and hence many studies have focused on developing a valid assessment. One of the most popular is the Edinburgh Handedness Inventory (EHI), however, its psychometric properties have been questioned and due to its complex response format, various modified versions of EHI are in use. One of them is a 7-item questionnaire produced by Dragovic and Milenkovic (2013), which seeks to reduce a potentially continuous variable to a categorical one by clearly classifying people as right- or left- handed. The purpose of this study was to develop a questionnaire to more accurately quantify mixed-handedness as a continuous variable, and to investigate the correlation between Dragovic’s modified 7-item EHI, new items created for this study, and three performance measures (grooved pegboard, finger-tapping and grip strength/dynamometer). A total of 113 self-reported right-, left- and mixed-handed participants were randomly recruited to complete the questionnaire and behavioural measures. The questionnaire data was submitted to exploratory factor analysis and resulting factor scores were examined for correlations with behavioural tests. Compared to the modified EHI, the questionnaire showed a more continuous grading of handedness. Moreover, the degree of handedness on the questionnaire showed a stronger correlation with all the performance measures than the performance measures had amongst themselves. These findings show that the novel questionnaire with modern-day items can provide an accurate estimate of the degree of mixed-handedness in both right- and left-handed individuals. Future studies should examine these measures on a larger sample of left-handed and ambidextrous people, who tend to be more variable than right-handers in their usage. The questionnaire can also be suitable for studying the relationship between variable handedness and other aspects of brain lateralization.
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Wood, William B. "The Left–Right Polarity Puzzle: Determining Embryonic Handedness." PLoS Biology 3, no. 8 (2005): e292. http://dx.doi.org/10.1371/journal.pbio.0030292.
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Borstnik, Norma Mankoc, and Anamarija Borstnik. "Left and right handedness of fermions and bosons." Journal of Physics G: Nuclear and Particle Physics 24, no. 5 (1998): 963–77. http://dx.doi.org/10.1088/0954-3899/24/5/005.
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Buenaventura Castillo, Carlos, Andy G. Lynch, and Silvia Paracchini. "Different laterality indexes are poorly correlated with one another but consistently show the tendency of males and females to be more left- and right-lateralized, respectively." Royal Society Open Science 7, no. 4 (2020): 191700. http://dx.doi.org/10.1098/rsos.191700.
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The most common way to assess handedness is based on the preferred hand for writing, leading to a binary (left or right) trait. Handedness can also be assessed as a continuous trait with laterality indexes, but these are not time- and cost-effective, and are not routinely collected. Rarely, different handedness measures are collected for the same individuals. Here, we assessed the relationship of preferred hand for writing with four laterality indexes, reported in previous literature, derived from measures of dexterity (pegboard task, marking squares and sorting matches) and strength (grip strength), available in a range of N = 6664–8069 children from the ALSPAC cohort. Although all indexes identified a higher proportion of individuals performing better with their right hand, they showed low correlation with each other (0.08–0.3). Left handers were less consistent compared to right handers in performing better with their dominant hand, but that varied across indexes, i.e. 13% of left handers performed better with their right hand on marking squares compared to 48% for sorting matches and grip strength. Analysis of sex effects on the laterality indexes showed that males and females tend to be, on all measures, more left- and right-lateralized, respectively. Males were also over-represented among the individuals performing equally with both hands suggesting they had a higher tendency to be weakly lateralized. This study shows that different handedness measures tap into different dimensions of laterality and cannot be used interchangeably. The trends observed across indexes for males and females suggest that sex effects should be taken into account in handedness and laterality studies.
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McFarland, Richard A., and Robert Kennison. "Handedness affects Emotional Valence Asymmetry." Perceptual and Motor Skills 68, no. 2 (1989): 435–41. http://dx.doi.org/10.2466/pms.1989.68.2.435.
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Music was played monaurally to 80 right-handed and 80 left-handed subjects. Right-handers reported more positive and less negative affect if the music was to the right ear. Left-handers reported experiencing more positive and less negative affect during music to the left ear. The hand × ear interaction was significant. The valence of emotional responses to the music seems influenced by a combination of at least two factors, (1) differences between left- and right-handers in the cerebral processing of emotional valence and (2) differences in the processing of emotional valence within each handedness group depending upon which hemisphere was initially most strongly engaged by the music. These results partially corroborate and extend the findings of previous studies in which briefer stimuli were presented tachistoscopically or dichotically. It is concluded that, while there is hemispheric asymmetry in the processing of emotional valence, the direction of the asymmetry may be associated with the handedness of the subjects.
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Reiß, Michael, Gilfe Reiß, and Hans-Albrecht Freye. "Some Aspects of Self-Reported Hand Preference." Perceptual and Motor Skills 86, no. 3 (1998): 953–54. http://dx.doi.org/10.2466/pms.1998.86.3.953.
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The aim of the present study was to compare self-reported handedness with the directly tested hand preference using a 10-item battery in sample of 1223 students. The question assessing self-reported handedness was whether you are a left- or a right-hander or you use both hands equally. Responses indicate that self-reported handedness is a crude but possible method of measurement. Female right-handers showed the best agreement.
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THOMAS, NICOLE A., DANE STUCKEL, CARL GUTWIN, and LORIN J. ELIAS. "Directional collisions during a route-following task." Journal of the International Neuropsychological Society 15, no. 2 (2009): 225–30. http://dx.doi.org/10.1017/s1355617709090328.
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AbstractNeurologically normal people tend to collide with objects on the right side more frequently than with objects located on the left side of space. This phenomenon could be attributable to pseudoneglect wherein individuals selectively attend to the left field. The current study investigated this effect using a virtual route-following task that was presented centrally, in the lower field, and in the upper field. Handedness was also examined. Fifty-two participants (four left handed) completed this task, and when presented in the lower field, more left-side collisions emerged. In the upper condition, this bias reversed direction to the expected rightward bias. In the central condition, there was no significant directional bias in collision behavior. An interaction between handedness and presentation condition indicated that left-handed participants experienced more right-side collisions in the central condition. Collectively, these results suggest that directional biases (i.e., left vs. right) in collision behavior are modulated by both location in the visual field (central, upper, or lower) and handedness. (JINS, 2009, 15, 225–230.)
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Ellis, Lee, Shyamal Das, and Anthony W. Hoskin. "Handedness and religiosity, a two-nation study: Evidence that hemispheric functioning may influence religious beliefs." Journal of Psychological Perspectives 5, no. 2 (2023): 71–78. http://dx.doi.org/10.47679/jopp.525872023.
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Prior research has reported that so-called consistent-handers are more religious than non-consistent-handers. This study analyzed data bearing on this possibility using large samples of college students from two different countries; Malaysia and the United States. When samples from both countries were separated by sex, no significant support for this prior research was found. However, when we analyzed our data with handedness dichotomized between right-handers and non-right-handers, some significant relationships were found. Among females in both countries, left- and mixed-handers expressed lower degrees of certainty about the existence of God and life-after-death. Also, right-handedness and religious service attendance were positively and significantly associated among Malaysian males. Among US males, however, belief in God was actually significantly stronger among right-handers than among left and mixed-handers. Assuming that right handedness is a rough proxy for left hemispheric dominance, our findings provide some support for the hypothesis that right hemispheric dominance is associated with orthodox religiosity at least among females.
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Mohebbi, Mehrnaz, Saeid Mahmoudian, Marzieh Sharifian Alborzi, Mojtaba Najafi-Koopaie, Ehsan Darestani Farahani, and Mohammad Farhadi. "Auditory Middle Latency Responses Differ in Right- and Left-Handed Subjects: An Evaluation Through Topographic Brain Mapping." American Journal of Audiology 23, no. 3 (2014): 273–81. http://dx.doi.org/10.1044/2014_aja-13-0059.
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Purpose To investigate the association of handedness with auditory middle latency responses (AMLRs) using topographic brain mapping by comparing amplitudes and latencies in frontocentral and hemispheric regions of interest (ROIs). Method The study included 44 healthy subjects with normal hearing (22 left handed and 22 right handed). AMLRs were recorded from 29 scalp electrodes in response to binaural 4-kHz tone bursts. Results Frontocentral ROI comparisons revealed that Pa and Pb amplitudes were significantly larger in the left-handed than the right-handed group. Topographic brain maps showed different distributions in AMLR components between the two groups. In hemispheric comparisons, Pa amplitude differed significantly across groups. A left-hemisphere emphasis of Pa was found in the right-handed group but not in the left-handed group. Conclusion This study provides evidence that handedness is associated with AMLR components in frontocentral and hemispheric ROI. Handedness should be considered an essential factor in the clinical or experimental use of AMLRs.
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Potdevin, Delphine, Parvaneh Adibpour, Clémentine Garric, et al. "Brain Lateralization for Language, Vocabulary Development and Handedness at 18 Months." Symmetry 15, no. 5 (2023): 989. http://dx.doi.org/10.3390/sym15050989.
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Is hemisphere lateralization for speech processing linked to handedness? To answer this question, we compared hemisphere lateralization for speech processing and handedness in 18-month-old infants, the age at which infants start to produce words and reach a stable pattern of handedness. To assess hemisphere lateralization for speech perception, we coupled event-related potential (ERP) recordings with a syllable-discrimination paradigm and measured response differences to a change in phoneme or voice (different speaker) in the left and right clusters of electrodes. To assess handedness, we gave a 15-item grasping test to infants. We also evaluated infants’ range of vocabulary to assess whether it was associated with direction and degree of handedness and language brain asymmetries. Brain signals in response to a change in phoneme and voice were left- and right-lateralized, respectively, indicating functional brain lateralization for speech processing in infants. Handedness and brain asymmetry for speech processing were not related. In addition, there were no interactions between the range of vocabulary and asymmetry in brain responses, even for a phoneme change. Together, a high degree of right-handedness and greater vocabulary range were associated with an increase in ERP amplitudes in voice condition, irrespective of hemisphere side, suggesting that they influence discrimination during voice processing.
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Graham, Charles J., Rhonda Dick, Vaughn I. Rickert, and Robert Glenn. "Left-handedness as a Risk Factor for Unintentional Injury in Children." Pediatrics 92, no. 6 (1993): 823–26. http://dx.doi.org/10.1542/peds.92.6.823.
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Objective. To determine whether left-handedness is a risk factor for unintentional injury among children and adolescents. Design. Case-control study. Setting. Pediatric emergency department of Arkansas Children's Hospital. Patients. 265 patients sustaining unintentional trauma aged 6 to 18 years and 494 control patients who did not have trauma were given a questionnaire to determine handedness, past unintentional injury, and parental perception of injury proneness. Results. The frequency of left-handedness in the trauma group (18.1%) was significantly greater than frequency of 10.5% in the control group (P < .003, odds ratio = 1.80, 95% confidence interval 1.20 to 2.72). Multivariate analysis revealed handedness as the only significant vanable between trauma and control (P < .04). The proportion of left-handers who had been hospitalized previously for injury treatment (20.0%) was larger than the proportion of right-handers, (12.0%) (P < .026, odds ratio = 1.84, 95% confidence interval 1.03 to 3.27). More parents of left-handens rated their child as "more clumsy than average' than parents of right-handens (26.0% vs 15.2%, P < .007). Conclusions. Left-handedness appears to be a risk factor for unintentional injury in children and adolescents in a pediatric emergency department population.
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Çatak, Esra Nur, Alper Açık, and Tilbe Göksun. "The relationship between handedness and valence: A gesture study." Quarterly Journal of Experimental Psychology 71, no. 12 (2018): 2615–26. http://dx.doi.org/10.1177/1747021817750110.
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People with different hand preferences assign positive and negative emotions to different sides of their bodies and produce co-speech gestures with their dominant hand when the content is positive. In this study, we investigated this side preference by handedness in both gesture comprehension and production. Participants watched faceless gesture videos with negative and positive content on eye tracker and were asked to retell the stories after each video. Results indicated no difference in looking preferences regarding being right- or left-handed. Yet, an effect of emotional valence was observed. Participants spent more time looking to the right (actor’s left) when the information was positive and to the left (actor’s right) when the information was negative. Participants’ retelling of stories revealed a handedness effect only for different types of gestures (representational vs beat). Individuals used their dominant hands for beat gestures. For representational gestures, while the right-handers used their right hands more, the left-handers gestured using both hands equally. Overall, the lack of significant difference between handedness and emotional content in both comprehension and production levels suggests that body-specific mental representations may not extend to the conversational level.
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Cardinal, Bradley J. "Does Physical Activity Behavior Vary by Handedness?" American Journal of Health Promotion 19, no. 6 (2005): 397–400. http://dx.doi.org/10.4278/0890-1171-19.6.397.
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Purpose. Explore whether adults' physical activity behavior or their use of physical activity behavior-change strategies, as derived from the Transtheoretical Model, differed by handedness. Methods. A cross-sectional survey of 151 adults' hand preference (i.e., handedness: right, left, ambidextrous) and their use of the behavioral and cognitive processes of change, decisional balance scores (i.e., pros minus cons), self-efficacy, and their stage of change for physical activity involvement. Results. Left-handers showed significantly less use of the behavioral and cognitive processes of change compared to right-handers (M = 46.9 vs. M = 40.5 and M = 46.9 vs. M = 40.5, respectively). Left-handers were also significantly more likely to be in the earlier (i.e., inactive or irregularly active) stages of change relative to right-handers (84.6% vs. 48.1%, respectively). Discussion. Handedness may be a previously unrecognized, heritable correlate of physical activity behavior and the use of physical activity behavior-change strategies.
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Nikolaeva, Elena Ivanovna, and Elizaveta Denisovna Golovacheva. "Comparative analysis of aggression levels in left-handed and right-handed adolescents." Science for Education Today 11, no. 1 (2021): 31–41. http://dx.doi.org/10.15293/2658-6762.2101.02.
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Introduction. The study examines the problem of aggression in education. Previous studies have discussed a number of reasons for school aggression. Left-handedness is frequently reported as an important risk factor of aggressive behaviours. The aim of this study is to compare the levels of aggressiveness between right-handed and left-handed adolescents. Materials and Methods. To date there has been little agreement on the assessment of handedness in scholarly literature. The authors of this article have divided the inventories aimed at assessing handedness into two groups: those identifying genetic predisposition, and those that assess the influence of social pressure. The study was conducted in St. Petersburg and involved 86 secondary school students aged between 11 and 15 years. Handedness was assessed using 7 tools frequently mentioned in scholarly literature. To assess the aggressiveness, the authors used Ch.D. Spielberger’s questionnaire (STAXI) adapted by A.B. Leonova. Results. It was found that the use of different inventory sets for assessing handedness significantly changes the distribution of adolescents according to this parameter. Tools which do not take into account social pressure identify significantly more left-handed people than those that depend on social pressure. The study has not identified significant differences between right-handed and left-handed adolescents in terms of the level of aggressiveness. At the same time, it was revealed that aggressiveness directed outward is higher in supposedly retrained left-handers. Conclusions. The study has not shown any significant differences in the level of aggressiveness between left-handed and right-handed adolescents. Future research should concentrate on the investigation of aggressiveness in retrained heft-handed adolescents.
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Hoyle, C., N. A. Brown, and L. Wolpert. "Development of left/right handedness in the chick heart." Development 115, no. 4 (1992): 1071–78. http://dx.doi.org/10.1242/dev.115.4.1071.
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The chick heart tube develops from the fusion of the right and left areas of precardiac mesoderm and in almost all cases loops to the embryo's right-hand side. We have investigated whether any intrinsic difference exists in the right and left areas of precardiac mesoderm, that influences the direction of looping of the heart tube. Chick embryos incubated to stages 4,5 and 6 were cultured by the New method. Areas of precardiac mesoderm were exchanged between donor and host embryos of the same stage and different stages to form control, double-right and double-left sided embryos. Overall, double-right sided embryos formed many more left-hand loops than double-left sided embryos. At stages 4 and 5 a small percentage of double-right embryos formed left-hand loops (13%) whereas at stage 6 almost 50% of hearts had left-hand loops. Control embryos formed right-hand loops in 97% of cases. The stability of right-hand heart looping by double-left sided embryos, may be related to the process of ‘conversion’, whereas the direction of looping by double-right sided embryos has become randomised. There is some indication that an intrinsic change occurred in the precardiac mesoderm between stages 5 and 6 that later influenced the direction of looping of the heart tube. The direction of body turning is suggested to be linked to the direction of heart looping.
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Rozaimi, Rusydi, Alexander Chong Shu-Chien, Youji Wang, et al. "Heterochely and handedness in the orange mud crab Scylla olivacea: implication for future culture practice optimisation." PeerJ 11 (April 3, 2023): e15143. http://dx.doi.org/10.7717/peerj.15143.
Full textAbstract:
Asymmetric body traits in bilateral organisms are common and serve a range of different functions. In crustaceans, specifically among brachyuran crabs, heterochely and handedness in some species are known to aid in behavioural responses such as food acquisition, and sexual and territorial displays. However, the heterochely of the intertidal mud crab genus Scylla is still poorly understood. This study investigated the cheliped morphometric characteristics of orange mud crab Scylla olivacea and the relation of heterochely and handedness to sex. Scylla olivacea is heterochelous, with predominant right-handed (70.2%). Three morphometric variables, i.e., propodus length (PL), propodus depth (PD), and propodus width (PW) were significantly larger in the right cheliped and the estimated handedness based on these three variables were consistent with the presence of molariform teeth. The effect of sex had no influence on the occurrence of heterochely or handedness. The frequency of left-handedness increased with size, especially in males. We postulate that handedness reversal, a phenomenon seen in other crab species when the dominant hand is lost, also occurs in S. olivacea, thereby resulting in a change in left-handedness frequency. The use of chelipeds by males in mate and territorial defenses might provide an explanation for the higher risk of losing a dominant cheliped and thus, higher left-handedness frequency compared to females. Future behavioural research could shed light on the selective forces that affect the handedness distribution in mud crabs. Knowledge on heterochely and handedness of mud crabs could be useful for future development of less aggressive crab populations by claw reversal and the optimisation of limb autotomy techniques.
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Zhao, Shun‐Cai, and Xin Lin. "Monochromatic Composite Right/Left Handedness in the Quantized Composite Right/Left Handed Transmission Line." Annalen der Physik 532, no. 3 (2019): 1900495. http://dx.doi.org/10.1002/andp.201900495.
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