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Literatura académica sobre el tema "Left- and right-handedness"
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Artículos de revistas sobre el tema "Left- and right-handedness"
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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.