Journal
MOTOR CONTROL
Volume 26, Issue 1, Pages 76-91Publisher
HUMAN KINETICS PUBL INC
DOI: 10.1123/mc.2021-0096
Keywords
motor control theories; bimanual coordination; object texture; grip force; motor evoked potential
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This study found that the ipsilateral corticospinal system plays a role in controlling threshold muscle length and modulating the influence of hand skin afferents on wrist muscle motoneurons.
We tested the hypothesis that the ipsilateral corticospinal system, like the contralateral corticospinal system, controls the threshold muscle length at which wrist muscles and the stretch reflex begin to act during holding tasks. Transcranial magnetic stimulation was applied over the right primary motor cortex in 21 healthy subjects holding a smooth or coarse block between the hands. Regardless of the lifting force, motor evoked potentials in right wrist flexors were larger for the smooth block. This result was explained based on experimental evidence that motor actions are controlled by shifting spatial stretch reflex thresholds. Thus, the ipsilateral corticospinal system is involved in threshold position control by modulating facilitatory influences of hand skin afferents on motoneurons of wrist muscles during bimanual object manipulation.
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