Journal Article10.1007/S002210050884
Direction information coordinated via the posterior third of the corpus callosum during bimanual movements.
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TL;DR: The data indicate that the posterior callosum mediates the coordination of direction information between the hands during bimanual movements, given the topographical organization of the corpusCallosum, this integration is likely carried out by parietal cortex.
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Abstract: We examined bimanual coordination in a patient before and after each stage of callosotomy surgery. We tested how well the patient coordinated movement direction between the hands. The patient drew symmetrical or asymmetrical figures simultaneously with both hands. Before surgery, symmetrical figures were drawn well and asymmetrical figures were drawn poorly. Following anterior callosotomy, the drawings improved slightly. Symmetrical figures were still drawn well, and asymmetrical ones were still drawn poorly. Thus, spatial integration remained intact despite the loss of interhemispheric communication between frontal cortical sites. After posterior callosotomy, spatial coordination deteriorated significantly. Mirror-image drawings became less symmetrical, while asymmetrical drawings improved. These data indicate that the posterior callosum mediates the coordination of direction information between the hands during bimanual movements. Given the topographical organization of the corpus callosum, this integration is likely carried out by parietal cortex.
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Citations
Cerebral specialization and interhemispheric communication: does the corpus callosum enable the human condition?
TL;DR: It is reasonable to suppose that the corpus callosum has enabled the development of the many specialized systems by allowing the reworking of existing cortical areas while preserving existing functions.
White Matter Development During Childhood and Adolescence: A Cross-sectional Diffusion Tensor Imaging Study
Naama Barnea-Goraly,Vinod Menon,Mark A. Eckert,Leanne Tamm,Roland Bammer,Asya Karchemskiy,Christopher Dant,Allan L. Reiss +7 more
TL;DR: It is demonstrated that during childhood and adolescence, white matter anisotropy changes in brain regions that are important for attention, motor skills, cognitive ability, and memory are changed.
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Intermanual coordination: from behavioural principles to neural-network interactions.
TL;DR: A distributed network that governs the processes of neural synchronization and desynchronization that underlie the rich variety of coordinated functions accounts for disruptions of interlimb coordination across various movement disorders.
793
How does the corpus callosum mediate interhemispheric transfer? A review
TL;DR: For future research it would be beneficial to investigate the functional role of the callosal sub regions to get a better understanding of function and use more appropriate experimental methods to determine functional connectivity when looking at interhemispheric transfer.
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Human Motor Corpus Callosum: Topography, Somatotopy, and Link between Microstructure and Function
Mathias Wahl,Birgit Lauterbach-Soon,Elke Hattingen,Patrick Jung,Oliver C. Singer,Steffen Volz,Johannes C. Klein,Helmuth Steinmetz,Ulf Ziemann +8 more
TL;DR: It is demonstrated that CMFs connecting defined body representations of M1 map onto a circumscribed region in the CC in a somatotopically organized manner, and the significant and topographically specific positive correlation between FA and interhemispheric inhibition strongly suggests that microstructure can be directly linked to functional connectivity.
438
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TL;DR: The hand representations of the SMA and M1 strongly differ with respect to the strength and distribution of callosal connectivity with the former having more powerful and widespread callosal connections with a number of motor fields of the opposite cortex than the latter.
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A human cerebral deconnection syndrome. A preliminary report.
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TL;DR: A patient whose clinical picture appears to be most simply explainable by a partial deconnection of the two cerebral hemispheres is presented, who appears to behave as if there were 2 nearly isolated half-brains, functioning almost independently.
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Bilateral Motor Interaction: Perceptual-Motor Performance of Partial and Complete “Split-Brain” Patients
B. Preilowski
- 01 Jan 1975
TL;DR: This review is based on tests with ten patients, eight of whom underwent a complete commissurotomy, i.e. the corpus callosum in its entirety, the anterior and hippocampal commissure, as well as the massa intermedia (when present) were sectioned in a single operation.
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Neuronal activity in the primate supplementary motor area and the primary motor cortex in relation to spatio-temporal bimanual coordination.
TL;DR: The results suggest that both the SMA and M1 may contribute to the control of sequential bimanual coordinated movements, but the contribution of other cortical and subcortical areas such as cingulate motor cortex and basal ganglia remains to be investigated.
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Channels of the corpus callosum. Evidence from simple reaction times to lateralized flashes in the normal and the split brain.
Marco Iacoboni,Eran Zaidel +1 more
TL;DR: Results are consistent with the latter hypothesis, showing that the motor task significantly changed the response hand by visual field interaction and the crossed-uncrossed difference, but only in normal subjects, perhaps producing a switch in the callosal channel subserving the interhemispheric transfer.
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