title: Interhemispheric control of unilateral movement.
abstract: To perform strictly unilateral movements, the brain relies on a large cortical and subcortical network. This network enables healthy adults to perform complex unimanual motor tasks without the activation of contralateral muscles. However, mirror movements (involuntary movements in ipsilateral muscles that can accompany intended movement) can be seen in healthy individuals if a task is complex or fatiguing, in childhood, and with increasing age. Lateralization of movement depends on complex interhemispheric communication between cortical (i.e., dorsal premotor cortex, supplementary motor area) and subcortical (i.e., basal ganglia) areas, probably coursing through the corpus callosum (CC). Here, we will focus on transcallosal interhemispheric inhibition (IHI), which facilitates complex unilateral movements and appears to play an important role in handedness, pathological conditions such as Parkinson's disease, and stroke recovery.
authors.affiliation: Department of Psychology, University of Montreal, Montreal, QC, Canada H3C 3J7.
authors.forename: Vincent
authors.initials: V
authors.lastname: Beaulé
authors.forename: Sara
authors.initials: S
authors.lastname: Tremblay
authors.forename: Hugo
authors.initials: H
authors.lastname: Théoret
mesh_terms: D000367:Age Factors; D003337:Corpus Callosum / Q000502:physiology; D006801:Humans; D009044:Motor Cortex / Q000502:physiology*; D009068:Movement / Q000502:physiology*; D009415:Nerve Net / Q000473:pathology / Q000502:physiology*; D011597:Psychomotor Performance / Q000502:physiology