Warning: The NCBI web site requires JavaScript to function. more...
Generate a file for use with external citation management software.
Department of Neurology, University of Hamburg, Federal Republic of Germany.
Motor excitability ipsilateral to pinch grips was investigated during the pre-movement period. Subjects performed right-handed phasic pinch grips with 2% or 20% maximum voluntary contraction (MVC) in response to a visual go-signal. Transcranial magnetic stimulation (TMS) was applied over the right motor cortex at various intervals before the go-signal and 100 msec after movement onset. Motor evoked potentials were recorded from the relaxed left first dorsal interosseous muscle. Immediately prior to and during 2% MVC pinch grips, MEP amplitudes were reduced. In contrast, MEPs obtained by transcranial electrical stimulation tended to be increased, indicating that MEP decreases are mediated at a cortical level. Before and during 20% MVC pinch grips MEP amplitudes were enhanced. TMS delayed reaction time if applied close to the go-signal. We conclude that the motor cortex ipsilateral to low force movements is inhibited prior to and during movement.
Your browsing activity is empty.
Activity recording is turned off.
Turn recording back on