Dissertations / Theses on the topic 'Interhemispheric transfer'
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McNeely, Heather (Heather Eva) Carleton University Dissertation Psychology. "The Interhemispheric transfer of emotional speech in the intact brain." Ottawa, 1996.
Find full textEacott, M. J. "The role of the anterior corpus callosum in interhemispheric transfer in monkeys." Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235024.
Full textKnight, Ann Marie. "Interhemispheric transfer of praxis information using probable Alzheimer's disease as a model for disconnection apraxia." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0010061.
Full textEllis, Monica U. "Chronic Outcomes in Interhemispheric Transfer Time Among Children with Moderate to Severe Traumatic Brain Injury." Thesis, Fuller Theological Seminary, School of Psychology, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10274421.
Full textBackground: Each year, nearly ½ million youth under 15 years old sustains a traumatic brain injury (TBI). Although racial disparities have not been found in pediatric TBI (Howard, Joseph, & Natale, 2005), the consequences of TBI still remain a serious public health concern. Moderate and severe TBI (msTBI) frequently result in diffuse axonal injury and other white matter damage. The corpus callosum (CC) is particularly vulnerable to injury, though the impact of this damage may not be apparent until several months-to-years following injury. Damage to the CC has been associated with impaired neurocognitive functioning in youth with TBI.
Method: The investigator for this dissertation study utilized event-related potentials, an electrophysiological measure of neural processing, to measure interhemispheric transfer time (IHTT) as an indicator of CC integrity in 31 youth with msTBI at the chronic phase of recovery (i.e., 13-18 months post injury), compared with 20 healthy control youth. Neurocognitive performance was also examined among these groups.
Results: At the chronic phase of recovery, TBI group youth overall demonstrated slower IHTTs and worse neurocognitive functioning than youth in the control group. Only a subset of msTBI group children had IHTTs that were outside the range of the healthy controls; however, this impairment in interhemispheric communication was not significantly associated with neurocognitive performance. A pattern of differential impairments emerged between TBI group participants. Chronic-phase outcomes in IHTT were correlated with the presence of neurosurgery at the acute phase of injury.
Conclusion: Overall, this study demonstrated that msTBI results in longstanding differences in interhemispheric and neurocognitive functioning, but injured children are differentially impacted. Functional reorganization resulting from neuroplasticity may help explain these results among children with slow IHTT but intact neurocognitive functioning. However, interpretations regarding the course of recovery could not be made due to the cross-sectional methodology used in this study. Investigators conducting future studies might explore additional outcomes associated with interhemispheric and neurocognitive functioning following msTBI at the chronic phase of recovery, including corresponding structural and metabolic changes using advanced imaging techniques.
Chaumillon, Romain. "Dominance oculaire : implications neurophysiologiques et conséquences au niveau de la visuo-motricité." Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4724/document.
Full textProcessing of visual information from the environment is preponderant for the successful performance of many motor behaviors. Despite a good knowledge of the visual system, a phenomenon corresponding to a lateralization of this system, called eye dominance (ED), remains not well understood and poorly studied. Our thesis demonstrated that ED has a widespread influence on different levels of the transformation of visual information into manual or ocular movements and interacts with other lateralizations of the central nervous system such as the manual and attentional networks. We also show the influence of ED on the process of information transfer between the two hemispheres of the brain. Finally, our work has direct clinical implications: it introduces a more accurate method of quantifying ED which is usable by clinicians for better success of some surgical techniques. In sum, we show that ED is an important aspect of the human brain lateralization which has been overlooked until now
Cherbuin, Nicolas, and n. cherbuin@anu edu au. "Hemispheric interaction: when and why is yours better than mine?" The Australian National University. Faculty of Science, 2006. http://thesis.anu.edu.au./public/adt-ANU20060317.135525.
Full textIglarsh, Judith Naomi. "Interhemispheric transfer deficits in schizophrenia." 1988. http://catalog.hathitrust.org/api/volumes/oclc/18699265.html.
Full textTypescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 32-37).
Barnett, Kylie. "Laterality and interhemispheric transfer in schizophrenia." 2004. http://hdl.handle.net/2292/365.
Full textFogle, Kelly L. "Cognitive flexibility, interhemispheric transfer and QEEG in concussed female athletes." 2013. http://liblink.bsu.edu/uhtbin/catkey/1722798.
Full textDepartment of Psychological Science
Bergert, Susanne [Verfasser]. "The interhemispheric transfer of visual stimuli and its relation to functional cerebral asymmetries / by Susanne Bergert." 2008. http://d-nb.info/992049954/34.
Full textCherbuin, Nicolas. "Hemispheric interaction: when and why is yours better than mine?" Phd thesis, 2005. http://hdl.handle.net/1885/45742.
Full textMazerolle, Erin L. "REFINEMENTS TO THE CURRENT UNDERSTANDING OF FUNCTIONAL MRI ACTIVATION IN WHITE MATTER." Thesis, 2012. http://hdl.handle.net/10222/14999.
Full textOuimet, Catherine. "Investigation des fonctions du corps calleux par l'étude du transfert interhémisphérique de l'information visuelle et motrice chez les individus normaux et callosotomisés." Thèse, 2010. http://hdl.handle.net/1866/4408.
Full textThe main role of the corpus callosum is the transfer of information across the cerebral hemispheres. Evidence for this function comes from studies investigating the interhemispheric communication of split-brain individuals. Specific experimental paradigms requiring interhemispheric integration have enabled the documentation of disconnection symptoms for split-brain individuals. Along those lines, the present thesis investigated the transfer of information underlying the redundant target effect (RTE), the crossed-uncrossed difference (CUD), and bimanual asynchrony of normal and split-brain individuals, and therefore contributed to further our knowledge of the role of the corpus callosum. The first study investigated the RTE of partial split-brain (anterior section), total split-brain, and normal individuals. The RTE occurs when reaction times (RTs) to multiple stimuli are faster than RTs to a single stimulus. Split-brain individuals typically exhibit an enhanced RTE as compared to normal individuals (Reuter-Lorenz et al., 1995). In order to investigate the conditions in which the enhanced RTE occurs, we tested the RTE in interhemispheric, intrahemispheric, and midline conditions, as well as with stimuli requiring different cortical contributions (stimuli defined by luminance, equiluminant colour, or motion). Our data supported the occurrence of an enhanced RTE for partial and total split-brain individuals as compared to normal individuals. This suggests that an anterior section of the corpus callosum, which disrupts the transfer of motor/decisional information, suffices to produce an enhanced RTE in split-brain individuals. In addition, in contrast with the RTE of normal individuals, that of total split-brain individuals was modulated as a function of a sensory manipulation. We therefore conclude that the enhanced RTE of split-brain individuals is attributable to both sensory and motor/decisional contributions. The second study investigated the CUD and the bimanual asynchrony of normal, partial split-brain, and total split-brain individuals. The CUD refers to the subtraction of mean RTs of uncrossed hand-visual hemifield combination from mean RTs of crossed hand-visual hemifield combination. In the context of our study, the asynchrony reflected the difference between the left-hand RT and the right-hand RT on each trial, irrespective of the side of presentation. The effect of sensory and attentional manipulations was assessed for both measures. Our study contributed to dissociate the CUD and bimanual asynchrony. Specifically, total split-brain individuals, but not partial split-brain individuals, showed a larger CUD than normal individuals, whereas both split-brain groups were less synchronous than normal individuals. We therefore postulate that independent processes underlie the CUD and bimanual asynchrony. Furthermore, the parallel modulation of the RTE and bimanual asynchrony across groups suggest common underlying processes for these two measures.
Brochu, Barbeau Elise. "Transfert et traitement de l’information visuomotrice dans le cerveau autiste : intégrité et hétérogénéité." Thèse, 2014. http://hdl.handle.net/1866/11785.
Full textIn addition to the triad of symptoms characterizing autism, this neurodevelopmental condition is characterized by visual and motor atypicalities and, at the cerebral level, by atypical connectivity between the different brain areas. Anatomically, one of the most replicated finding is a reduction of the corpus callosum. However, evidence of a direct effect of the corpus callosum reductions on integrity and efficiency of interhemispheric transfer is lacking. Three different studies were designed to investigate different aspect of visuo-motor processing: interhemispheric transfer between bilateral motor and visual brain areas, perceptual processing speed, visually guided motor performance. In the first study, the visuo-motor Poffenberger paradigm was used to measure interhemispheric transfer time (IHTT). Structural and functional magnetic resonance imaging (fMRI) and diffusion tensor imaging (DTI) were also used to study the brain networks involved in the Poffenberger task. Autistics were compared to typically developing individuals. The second study investigates whether perceptual processing speed (Inspection Time task) is atypical in autism. In the third study, two visually-guided motor tasks (the Purdue pegboard and Annett peg moving task) were used to verify the nature and magnitude of motor deficits. The Purdue task includes two bimanual conditions used as additional measures of interhemispheric communication integrity. Moreover, in studies 2 and 3, behavioral differences between autistic and Asperger individuals were investigated in order to see if and how the two subgroups can be distinguished in terms of perceptual processing and motor deficits. No group difference was observed in terms of IHTT. The fMRI results reveal a different pattern of cortical activations associated to the Poffenberger task. In the autism and typical groups, the efficiency of interhemispheric communication was associated with different portions of the corpus callosum (frontal/premotor in typicals, posterior/visual in autistics). These results demonstrate an atypical pattern of interhemispheric visuo-motor information transfer, possibly reflecting a more prominent role of visual mechanisms guiding sensorimotor behavior in autism, related to cerebral reorganizations. Results of the behavioral studies indicate that autistics have an excellent visual processing speed while Asperger individuals performed like typicals. Motor impairments also differed between the two subgroups; dexterity and bimanual coordination was impaired in Asperger individuals but not in autistics, who presented more difficulties in unimanual conditions. Autism and Asperger subgroups are characterized by different cognitive profiles in which visual processing and motor deficits are important factors.
Morin-Moncet, Olivier. "Investigation de l’effet du polymorphisme Val66Met du gène BDNF sur les mécanismes neurophysiologiques qui sous-tendent les apprentissages moteurs procéduraux et sensorimoteurs, de même que sur le transfert intermanuel des apprentissages." Thèse, 2017. http://hdl.handle.net/1866/20776.
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