Title: Involvement of the primary motor cortex in controlling movements executed with the ipsilateral hand differs between left and right handers
Authors: van den Berg, Femke
Swinnen, Stephan
Wenderoth, Nici # ×
Issue Date: Nov-2011
Publisher: MIT Press
Series Title: Journal of Cognitive Neuroscience vol:23 issue:11 pages:3456-3469
Abstract: Unimanual motor tasks, specifically movements that are complex or require high forces, activate not only the contralateral primary motor cortex (M1) but evoke also ipsilateral M1 activity. This involvement of ipsilateral M1 is asymmetric, such that the left M1 is more involved in motor control with the left hand, than the right M1 in movements with the right hand. This suggests that the left hemisphere is specialized for movement control of either hand, even though previous experiments tested mostly right handed participants. In contrast, research on hemispheric asymmetries of ipsilateral M1 involvement in left handed participants is relatively scarce. In the present study, left and right handed participants performed complex unimanual movements, while transcranial magnetic stimulation (TMS) was used to disrupt the activity of ipsilateral M1 in accordance with a “virtual lesion” approach. For right handed participants, more disruptions were induced when TMS was applied over the dominant (left) M1. For left handed participants two subgroups could be distinguished, such that one group showed more disruptions when TMS was applied over the non-dominant (left) M1, while the other subgroup showed more disruptions when the dominant (right) M1 was stimulated. This indicates that functional asymmetries of M1 involvement during ipsilateral movements are influenced by both hand dominance as well as left hemisphere specialization. We propose that the functional asymmetries in ipsilateral M1 involvement during unimanual movements are primarily attributable to asymmetries in the higher-order areas, even though the contribution of transcallosal pathways and ipsilateral projections can not be completely ruled out.
ISSN: 0898-929X
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Movement Control & Neuroplasticity Research Group
× corresponding author
# (joint) last author

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