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Dissertations / Theses on the topic 'Left- and right-handedness'
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Ivanova, D., Оксана Робертівна Гладченко, Оксана Робертовна Гладченко, and Oksana Robertivna Hladchenko. "Left- handedness versus right-handedness." Thesis, Sumy State University, 2020. https://essuir.sumdu.edu.ua/handle/123456789/77983.
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I am left-handed. I always wonder why people who write with their right hands react so violently seeing me operating with my left hand and often ask such questions as "How do you do this?", "Do you feel comfortable?" So I want to figure out how left-handed children differ from children who write with their right hand.
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Longo-Bartel, Martha Jane. "Left-handed teaching techniques for the right handed." CSUSB ScholarWorks, 2000. https://scholarworks.lib.csusb.edu/etd-project/1681.
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Left-handedness is an invisible handicap in today's classrooms. The education systsem in the United States makes special considerations and accommodations for special needs of students, yet left-handed individuals do not receive much consideration in a mainstream classroom. Experts say that up to twenty percent of children in Canada and the United States are left-handed. This project discusses how these left-handed children have to work in a right-handed world. The focus of this study was to provide right-handed teachers with teaching techniques, positive suggestions, and common sense approaches to accomodate the left-handed pupil.
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Smythe, Pamela. "Aspects of phonological processing in sub-groups of left and right handedness." Thesis, University of Leicester, 2002. http://hdl.handle.net/2381/31348.
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This thesis was begun with two intentions. The first was to test a hypothesis of the Annett Right Shift Theory (1972, 1985) that people with poor phonology are less biased to right-handedness than the general population. The second was to establish whether to reduced bias to dextrality applies to deficits in all types of phonological processing. Evidence for an association between poor phonological processing and reduced dextrality was demonstrated in an age cohort of schoolchildren and in two large undergraduate samples. Cases of 'pathological' handedness are unlikely to have caused the association as, in children, the differences increased when those with slow hand skill and poor vocabularies were removed. Support for a genetic influence upon phonological processing was found when groups of children and undergraduates with varying phonological ability also varied for their relatives' handedness. Although, as expected, undergraduates with problems with nonword rhyme were more often left-handed and had more left handed relatives, against predictions, those with phoneme discrimination difficulties were much more dextral in handedness and had fewer left handed relatives. These interesting results were further investigated and poor ability in either phonological production/segmentation or rhyme/awareness was found to be associated with a reduced shift to dextrality. Finally an atypical pattern in dichotic listening (equal errors at each ear) was associated with phonological awareness difficulties, as was the atypical pattern of absence of shift to dextrality in handedness. The findings suggest that poor phonological awareness or phonological production/segmentation could be a risk in the rs - genotype and minor phoneme perception problems could be a disadvantage for the rs++ genotype. It is also suggested that the latter could be part of a multi-sensory problem (Stein and Walsh, 1997). These questions are discussed further and the contributions, limitations and implications of the work are reviewed.
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Butler, Michael. "The effects of depth processing and handedness on episodic memory /." Connect to Online Resource-OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1177948630.
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Thesis (M.A.)--University of Toledo, 2007.Typescript. "Submitted as partial fulfillment of the requirements for the Master of Arts in Psychology." "A thesis entitled"--at head of title. Bibliography: leaves 20-22.
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Xie, Jiawei. "Writing Chinese Characters: Right or Left? : The Chinese Discriminatory Policy of Left-Handedness Correction in Terms of Handwriting." Thesis, Linköpings universitet, Centrum för tillämpad etik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-129186.
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Chinese left-handed are found to be very few, especially in terms of handwriting. The Chinese educational policy that fully entitles teachers in primary school to change the left-handed students to write with their right-hand, by nudging and even force, is found to be mainly blamed as the main cause. The thesis is to raise the ethical discussion and define this policy as being discriminatory against the left-handed by checking the features, definition and identification of discrimination, and reasons forming and supporting such a discriminatory policy will be taken into the major consideration as the source of discrimination. Therefore, the thesis is to propose solutions to help with the abolishment of the policy and the elimination of the prejudicial attitudes toward the left-handed, especially in terms of writing. The thesis itself, due to the limit of previous research and scientific support, has its own blindness or disadvantage, however, such a work could be helpful with the later discussion.
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Shek, Wing-yi, and 石詠儀. "Research into handedness and language dominance in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B45161872.
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Dragovic, Milan. "Measurement, classification and conceptualisation of atypical handedness in schizophrenia." University of Western Australia. School of Psychiatry and Clinical Neurosciences, 2005. http://theses.library.uwa.edu.au/adt-WU2005.0071.
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[Truncated abstract] Atypical handedness is found to be more prevalent in schizophrenia patients than in psychiatric and normal controls, suggesting atypical brain lateralisation, particularly of regions associated with language. This ‘behavioural aberration’ is commonly considered as a marker of disturbed neurodevelopment, which is usually indexed by minor physical abnormalities. A prevailing view in the literature is that the atypical lateralisation of hand preference provides an additional index for the neurodevelopmental hypothesis of schizophrenia. Consistent with this hypothesis, an atypical lateralisation of hand preferences can also be considered as a consequence of environmental agents that might have interfered with early embryonic development. Notwithstanding the above, an atypical lateralisation of hand preferences can occur as a result of genetic factors as well as an interaction between genetic and environmental factors. The overall objective of this thesis was to advance existing knowledge on atypical laterality in schizophrenia by addressing its various (though related) aspects, including measurement, classification and conceptualisation. Atypical lateralisation of hand preferences in schizophrenia patients was approached by five separate studies. ... Overall, this thesis argues that the causes of atypical lateralisation of hand preferences are due to combined genetic and environmental factors and that its use as a marker of vulnerability to schizophrenia is limited. A cautious interpretation of various associations between the laterality and other measures, particularly cognitive measures, is advised until a broad agreement on the true nature of handedness is reached.
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Hladik, Amber Elizabeth. "An online community helping left-handed right brained students succeed." CSUSB ScholarWorks, 2007. https://scholarworks.lib.csusb.edu/etd-project/3214.
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The purpose of this project is to develop a website that helps left handed students, their parents, and teachers to help left-handers, whether they are left-or-right-brain dominant, succeed. This website will be a tool to get to know their children and students better. The project consists of a paper and a website to educate about left-handed people.
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Martínez, Daniel. "Sex and handedness effects on cognitive abilities." CSUSB ScholarWorks, 1987. https://scholarworks.lib.csusb.edu/etd-project/355.
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Walker, Kenneth N. (Kenneth Neal). "Differential Effects of Biofeedback Input on Lowering Frontalis Electromyographic Levels in Right and Left Handers." Thesis, University of North Texas, 1990. https://digital.library.unt.edu/ark:/67531/metadc331405/.
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This investigation was an attempt to replicate and expand previous research which suggested that laterality of electromyographic biofeedback input had a significant effect in lowering frontalis muscle activity. In 1984 Ginn and Harrell conducted a study in which they reported that subjects receiving left ear only audio biofeedback had significantly greater reductions in frontalis muscle activity than those receiving right ear only or both ear feedback. This study was limited to one biofeedback session and subjects were selected based on demonstration of right hand/ear dominance. The purpose of the present study was to determine whether the left ear effect reported by Ginn and Harrell could be replicated. Furthermore, the current investigation sought to extend the previous finding to left handed subjects and explore the stability of the effect, if found, by adding a second biofeedback session.
Subjects were 96 students recruited from undergraduate psychology classes. They were screened for handedness by the Edinburgh Handedness Inventory which resulted in identification of 48 right handers and 48 left handers. Subjects were randomly assigned to one of four groups consisting of left ear feedback, right ear feedback, both ears feedback, and controls. This resulted in eight conditions.
Analysis of variance of microvolt changes from baseline found no statistically significant differences between groups. An examination of the rank order of the data reveal a left ear group performance in the same direction as those reported by Ginn and Harrell (1984).
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Langan, Jeanne Marie. "Handedness and cortical plasticity in stroke rehabilitation /." view abstract or download file of text, 2006. http://proquest.umi.com/pqdweb?did=1188874021&sid=1&Fmt=2&clientId=11238&RQT=309&VName=PQD.
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Thesis (Ph. D.)--University of Oregon, 2006.Typescript. Includes vita and abstract. Includes bibliographical references (leaves 124-134). Also available for download via the World Wide Web; free to University of Oregon users.
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Shore, Robert. "A functional characterisation of the PCSK6 locus associated with handedness." Thesis, University of St Andrews, 2016. http://hdl.handle.net/10023/15719.
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Humans display a 90% population level bias towards right-handedness, implying the vast majority of people have a left-hemisphere dominant for motor control. Although handedness presents a weak, but very consistent heritability across the literature (estimated to be approximately 25%), to date few genetic loci associated with this complex trait have been identified and replicated in subsequent studies. One such gene which has been found to be associated with handedness and subsequently replicated is PCSK6, most recently through a quantitative GWAS (P < 0.5*10−8, Brandler et al. (2013)). Interestingly, PCSK6 is known to activate Nodal, a morphogen involved in a highly conserved bilaterian pathway known to regulate left-right body axis determination. Here I present the first molecular characterisation of a handedness-associated region by conducting a detailed functional analysis of the PCSK6 locus, combining genetic analysis, in silico prediction and molecular assays to investigate how common genetic variants influence handedness-related phenotypes. Specifically, I defined the associated locus to be 12.7 kb in size, spanning a predicted 1.8 kb bidirectional promoter which controls the expression of both an antisense long non-coding RNA (lncRNA), and a novel short PCSK6 isoform. A series of luciferase-expressing constructs were generated to characterise the promoter, identifying a minimal sequence capable of driving transcription in a sense strand direction. I have demonstrated experimentally that one of the top associated markers in previous GWA studies, rs11855145, directly creates/disrupts a suspected transcription factor bind site in the vicinity of this bidirectional promoter. Further functional studies of the genetic variation within PCSK6 may help explain the molecular regulatory mechanisms affecting gene expression. This project provides a model for assays to study other GWAS-nominated candidate genes, and in particular for establishing the role of noncoding variants. The findings from this study support the role of common variants in influencing complex phenotypes, such as handedness.
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Larkin, Janet Dawne. "Kinematic profiles of the hands in a bimanual task: a study in movement asymmetry /." Access Digital Full Text version, 1985. http://pocketknowledge.tc.columbia.edu/home.php/bybib/10992509.
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Thesis (Ed.D.)--Teachers College, Columbia University, 1985.Typescript; issued also on microfilm. Sponsor: J. R. Higgins. Dissertation Committee: A. M. Gentile. Includes bibliographical references: (leaves 48-52).
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Staley, Charon M. "Asymmetrical location of the external auditory meatuses and lateralization." Virtual Press, 1989. http://liblink.bsu.edu/uhtbin/catkey/560287.
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Since the face forms over the brain in the course of embryonic development, facial anthropometry may reflect brain structure. The motor functions of each side are controlled by the side of the brain opposite the body side. The purpose of this study was to establish whether a correlation exists between handedness and the location of the external auditory meatuses, as a possible consequence of brain asymmetry. Facial photographs were taken of 78 volunteers. Straws, placed in the external ear canals, were used to mark the external auditory meatuses. The level of the top of each meatus was measured from each volunteer's visual plane, as established by connecting the center of a point of reflected light in each pupil. Each volunteer was also given the Edinburgh Laterality Inventory (Durden-Smith and DeSimone, 1984:53) to determine "true" handedness (50 right-handers and 28 left-handers). Right-handers, as determined by either writing hand or laterality inventory, were found to exhibit a greater tendency for the left auditory meatus to be lower. Specifically, 68% of the right-handers, as opposed to 39% of the left-handers, exhibited a left external auditory meatus located at a lower position on the skull than the right meatus. This was significant at the 0.05 level. The differences in external auditory meatal distances from the visual plane were greater on the left in right-handers 68% of the time, equal 10%, and greater on the right 22% of the time. A reverse correlation for the right asymmetry for left-handers was not found. Instead, for the left-handed sample a nearly even distribution for meatal location was found: 39% left asymmetry, 29% symmetry, and 32% right asymmetry.The study strongly supported the hypothesis that right-handers have a significant tendency for left asymmetry in location of the external auditory meatuses. The study did not support the hypothesis that the meatal asymmetry correlates to the side opposite the handedness of the individual. Of-perhaps greater significance is the finding that the percentages of left asymmetry of both groups match the brain asymmetry percentages found by Galaburda (1984:15) for the planum temporale, an extension on the upper surface of the temporal lobe of the brain. The level of the external auditory meatuses, as a reflection of brain asymmetry, may serve as an external measurement of the location of Wernicke's area which is located near the planum temporale and has a major role in speaking and comprehension of the spoken word and in reading and writing. Simple techniques for locating the language centers of the brain would be an advantage in developing education plans and teaching strategies for students with each of the possible hemispheric dominance patterns.Department of Anthropology
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Medland, Sarah. "The genetic epidemiology of behavioural laterality /." [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe19204.pdf.
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Grieshaber, Kate. "Polymetric performance by musicians /." Thesis, Connect to this title online; UW restricted, 1990. http://hdl.handle.net/1773/11345.
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Choudhary, Carolyn J. "Why laterality matters in trauma : sinister aspects of memory and emotion." Thesis, University of Stirling, 2008. http://hdl.handle.net/1893/1225.
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This thesis presents an eclectic mix of studies which consider laterality in the context of previous findings of increased prevalence of Posttraumatic Stress Disorder (PTSD) in male combat veterans with non-consistent right hand preference. Two studies extend these findings not just to civilian populations and women, but to left handers and find that left, rather than mixed, handedness is associated with increased prevalence of PTSD in both general population and clinical samples, and to severity of symptoms in the former. To examine issues relevant to the fear response in healthy populations, a movie excerpt is shown to be theoretically likely to target the emotion of fear and to generate subjective and physiological (skin conductance) responses of fear. The film is used as a laboratory analogue of fear to examine possible differences in left and right handers in memory (for events of the film) and in an emotional Stroop paradigm known to produce a robust and large effect specifically in PTSD. According to predictions based on lateralisation of functions in the brain relevant to the fear response, left handers show a pattern of enhanced memory for visual items and poorer memory for verbal material compared to right handers. Immediately after viewing the film, left handers show an interference effect on the Stroop paradigm to general threat and film words and increased response latency compared to right handers, approaching performance of previously reported clinical samples with PTSD. A novel non-word Stroop task fails to show these effects, consistent both with accounts of interference as language processing effects and compromised verbal processing in PTSD. Unexpected inferior performance of females in memory for the film, contrary to previous literature, may also be amenable to explanations invoking compromised left hemisphere language functions in fear situations. In testing one theory of left handedness as due to increased levels of in utero testosterone, the 2D:4D (second to fourth digit ratio) provides mixed evidence in two samples. A possible association of more female-like digit ratios in males with PTSD is a tentative finding possibly relevant to sex differences in prevalence of PTSD. A critique of existing and inadequate theoretical accounts of handedness concludes the thesis and proposes a modification of the birth stress hypothesis to one specifically considering peri-natal trauma to account for the above findings. This hypothesis remains to be empirically tested.
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Semmler, John Gregory. "Effect of training on corticospinal control of human motor units /." Title page, table of contents and abstract only, 1996. http://web4.library.adelaide.edu.au/theses/09PH/09phs471.pdf.
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Ramsey, David Sanford. "Determining possible differing adverbial placement between the linguistic structures of left- and right-handed writers." CSUSB ScholarWorks, 1998. https://scholarworks.lib.csusb.edu/etd-project/1772.
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This thesis has attempted to determine if there are differences, concerning adverbial placement, between the sentences of left- and right-handed writers. To make this determination, I have statistically analyzed compositions of eight graduate students (four left-handed and four right-), and two left-handed published authors' (Lewis Carroll's and Mark Twains) private correspondence.
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Wilcox, Gary A. (Gary Alden). "Handedness, Perceptual and Short Term Memory Asymmetries, and Personality." Thesis, North Texas State University, 1985. https://digital.library.unt.edu/ark:/67531/metadc331119/.
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A large body of research has depicted relative arousal of the left and right cerebral hemispheres as related to utilization of particular defensive coping styles, level of anxiety, and perceptual styles. The right and left hemispheres are also presented in the literature as differing in visual-spatial and verbal-auditory short term memory abilities.
The present research studied 127 right handed undergraduates' relative performance on forward spatial and digits memory spans in relation to hemispheric lateralization and other perceptual and personality variables hypothesized in the literature to be related to hemispheric arousal.
It was hypothesized that the forward spatial and digit memory spans would display asymmetrical sensitivity to hemispheric arousal. That is, in a series of successive factor analyses, a hemispheric balance factor, a trait anxiety factor, and a short term memory factor would emerge. The three factors were hypothesized to be unrelated to each other.
During an initial group pretesting, subjects were given pencil and paper measures of handedness, trait anxiety, and several defensive coping styles. During a second individual testing, subjects were administered measures of short term memory, field independence, and a computerized presentation of geometric designs which measured the subjects ability to detect differences which occurred at either the global or analytic level (Navon task).
The factor analyses revealed only the hypothesized trait anxiety factor. The hypothesized short term memory and hemispheric balance of arousal factors did not emerge. Instead, a. defensive coping style factor and separate verbal—auditory and visual-spatial short term memory factors emerged.
Several methodological difficulties of the present study which possibly contributed to the failure of the two hypothesized factors to emerge were discussed. Several additional findings, including sex differences in hemispheric lateralization, were presented. Also, signal detection analysis revealed a pattern such that trait anxious subjects were biased toward over-reporting differences on the Navon task. Implications for further research were presented.
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Westfall, Jonathan E. "Exploring Common Antecedents of Three Related Decision Biases." Connect to full text in OhioLINK ETD Center, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1248468207.
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Kelly, Rachel Louise. "Understanding the neurophysiology of action interpretation in right and left-handed individuals." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53589.
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Investigating the neurophysiology behind our action encoding system offers a way of probing the underlying mechanisms regarding how we understand seen action. The ability to mentally simulate action (motor simulation) is a strong proposal to understand how we interpret others’ actions. The process of how we generate accurate motor simulations is proposed to be reliant on the context of the movement and sensory feedback from the limb. However, the neurophysiological mechanisms behind motor simulation are not yet understood. Known motor physiology for right-handed individuals show there is a left parietal-frontal network for the mental simulation of skilled movements; however, it remains unclear whether this is due to right limb dominance of the observer’s motor system because action simulation research has been focused primarily on right-handed individuals. The goal of this dissertation is to understand the underlying neurophysiology of the motor simulation process during action encoding. Generally, we propose different strategies of action simulation between right and left handed individuals. More specifically, we propose that right-handed individuals rely on their motor dominant left hemisphere for action encoding and motor simulation, while left-handed individuals will rely on their motor dominant right hemisphere. We will test this by evaluating neurobehavioral patterns of potential symmetry and asymmetry of motor simulation and action encoding based on patterns of limb dominance. We will also evaluate how impaired sensory feedback affects motor simulations, which can reveal how limb state affects the simulation process. The results of this series of studies will fill a void in our basic understanding of the motor simulation process and may generalize to populations with upper limb functional loss. Specifically, those with different hand dominance may require different rehabilitation programs in order to retrain an affected limb.
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VanAlstine, Lee Fredric. "Left out when playing the recorder right: Effects of bimanual performance of melodic instruments in regards to hand asymmetry in musicians." OpenSIUC, 2009. https://opensiuc.lib.siu.edu/theses/58.
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This experiment was based upon earlier research involving beginning musicians' perception of how handedness interferes with their performance of melodic instruments, (VanAlstine, 2006) and the analysis of earlier studies by Laeng and Park (1999) involving the impact of handedness in playing the piano traditionally and in a "reversed" fashion. This study was conducted involving the performance of musical examples on the recorder where the subjects played in a traditional manner, as well as with reversed hand position. Laeng and Park found left-handed beginning and experienced musician's grouped subjects performed better upon a reversed keyboard than performing upon a traditional keyboard, Laeng and Park (1999). VanAlstine hypothesized that beginning musicians would play more correct notes with their dominant hand when playing the melodic examples, whereas advanced students would show less specialization when performing the musical examples with either hand. There were 60 subjects total, 30 beginning players from Carterville Intermediate School and 30 advanced players from the southern Illinois area, including the Southern Illinois University Carbondale School of Music. Subjects were given an Edinburgh-styled handedness test to identify them as either left- or right-handed performers. The subjects were further divided into groups of 15 beginning left-handed players, 15 beginning right-handed players, 15 advanced left-handed players and 15 advanced right-handed players. Subjects played short musical examples on the recorder with traditional fingering and then with reversed hands. The performance was evaluated by two judges. Beginning right-handed musicians who performed upon the "reversed" recorder played as well as performers who were left-handed and played the soprano recorder traditionally, with their dominant hand on the top half of the instrument. The left- and right- handed advanced musicians played the musical examples equally well in both the traditional style and in the "reversed style."
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McCauley, Randall Wayne. "Sex and handedness effects on two types of cognitive ability tasks." CSUSB ScholarWorks, 1990. https://scholarworks.lib.csusb.edu/etd-project/462.
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Hättig, Heinz. "Entwicklung und Erprobung eines dichotischen Hörtests zur Erfassung der Sprachdominanz bei epilepsiechirurgischen Kandidaten." Doctoral thesis, Humboldt-Universität zu Berlin, Medizinische Fakultät - Universitätsklinikum Charité, 2004. http://dx.doi.org/10.18452/15134.
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Nach dem Prinzip synchronisierter Reimwörter wurde ein deutscher dichotischer Hörtest entwickelt und erprobt (Fused Words, FW10b). Die Reliabilitätskennwerte lagen für die innere Konsistenz bei alpha=0,89 und für die Re-Test-Reliabilität im Bereich von r-tt=0,67 bis r-tt=0,87. Der dichotische Test korrelierte hoch mit einem Paralleltest (r=.73, FW12k). In mehreren Untersuchungen fand sich keine Assoziation des dichotischen Lateralisationsergebnisses mit dem Hormonzyklus bei Frauen. Zwischen der Klassifikation im Wada-Test und der Klassifikation im dichotischen Test wurde eine hohe prozentuale Übereinstimmung beobachtet (91%). Auch in einer externen Studie wurde eine hohe Konkordanz mit einem fMRT Paradigma gefunden (97%, Hund-Georgiadis et al 2002). Unter Rechtshändern hatten 70% einen Rechts-Ohr-Vorteil, 23% einen Links-Ohr-Vorteil; bei 7% wurde kein Ohr-Vorteil beobachtet. Es bestand eine hohe Assoziation zwischen dem Lateralitätsquotient der Händigkeit und dem Lateralitätsindex Lambda aus dem dichotischen Test (R=0,76, r=0,72). Bei epilepsiechirurgischen Kandidaten mit links- oder rechtsseitigen Temporallappenläsionen, die alle durch einen Wada-Test als unilateral links-hemisphärisch sprachdominant kategorisiert worden waren, wurden Läsionseffekte analysiert (Hippocampus-Sklerose vs. extra-hippocampale Läsionen). Wie erwartet ergaben sich massive Läsionseffekte für die Patienten mit den Läsionen in der linken sprachdominanten Hemisphäre. In der linken extra-hippocampalen Untergruppe kam es zu einer signifikanten Abnahme der Rechts-Ohr-Punkte und gleichzeitig zu einem signifikanten Anstieg der Links-Ohr-Punkte. Die Einbeziehung von neokortikalen und anderen extra-hippocampalen Strukturen in die temporalen Läsionen war von entscheidender Bedeutung für die Unterdrückung der Antworten vom kontralateralen (rechtsseitigen) Ohr. Die Zunahme der Links-Ohr-Punkte in der Gruppe mit linksseitigen extra-hippocampalen Läsionen deutet eine kompensatorische Verlagerung von Sprachfunktionen auf die rechte Hemisphäre an, die durch den Wada Test nicht erfasst wurde.Following the principle of synchronized rhyming words a German dichotic listening test was developed and tested (fused words, FW10b). Reliability coefficients for the inner consistency were at alpha=0,89 and for the re-test-reliability between r-tt=0,67 and r-tt=0,87. The dichotic test FW10b was highly correlated with a parallel test (r=.73, FW12k). None of several studies did show any association between the dichotic language lateralization and the hormonal cycle in women. A high percentage of agreement was observed between the Wada classification and the classification by the dichotic test (91%). Furthermore Hund-Georgiadis et al. (2002) found a high percentage of concordance with the lateralization by a fMRI paradigm in an external study (97%). Among right-handers 70% showed a right ear advantage, 23% had a left ear advantage, and 7% had no ear advantage. There was a high association between the laterality quotient of the handedness inventory and the laterality index Lambda of the dichotic listening test FW10b (R=0.76, r=0.72). Lesion effects were analyzed in epilepsy surgical candidates with left and right temporal lobe lesions (hippocampus sclerosis vs. extra-hippocampal lesions), who were all categorized as left-hemispheric language dominant by a Wada-test. As expected, massive lesion effects were apparent in those patients who had their lesions in the left language dominant hemisphere. In the subgroup with left extra-hippocampal lesions there was a significant decrease of right-ear-points and at the same time a significant increase of left-ear-points. The involvement of neocortex and other extra-hippocampal structures in temporal lobe lesions were of crucial importance for the suppression of contralateral (right) ear responses. The elevation of left-ear-points in the left-lateral group indicated a partial compensational shift of language functions to the right hemisphere, which was not detected by the Wada procedure.
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Wheeler, James Peter. "'n Rorschachstudie van links- en regshandigheid." Thesis, 2015. http://hdl.handle.net/10210/14775.
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Smith, Stanley Andrew. "A comparative study of left and right lateralised adolescents with regard to spatial ability." Thesis, 2014. http://hdl.handle.net/10210/9904.
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M.A. (Psychology)Spatial ability as a cognitive ability has for some time been recognised as a distinct component in the intellectual make-up of the individual. Since the earliest identification of spatial ability in the 1920's, interest has been shown in the fuller understanding of this ability. Many controversies still exist since spatial ability has yet to be defined in a definitive manner. Spatial ability has received relatively little attention. Since a relationship between spatial ability and occupational success has been established, more interest has been shown in this field. Spatial ability is as important as language for survival in the business world and more so in the technical field. Spatial ability is synonymous with the socalled "minor" hemisphere. The importance of the "minor" hemisphere and in particular the link between the right hemisphere and the language centres of the left hemisphere, has recently been. recognised. This recognition is found where the right hemisphere together with the damaged left hemisphere may be included in a rehabilitation programme. Spatial ability is the product of environmental influences which include child rearing practices, education and nutrition. Other influences are of a genetic, hormonal and neurological nature. Associated the concept terms, the associated with of left with the cognitive functions of the brain, is lateralisation of functions.