EFFECTS OF JUDGMENT PROCESS ON MOTOR EVOKED-POTENTIALS IN GO NO-GO HAND MOVEMENT TASK

We examined the motor evoked potentials (MEP) of the forearm muscles f ollowing transcranial magnetic stimulation after the Go/No-go reaction -time hands movement in ten normal subjects. Facilitation of MEP of th e agonistic muscles and suppression of MEP of the antagonistic muscles were recognized during the 'Go' session, while the MEPs of both muscl es were markedly suppressed in the 'No-go' session. We considered that this MEP changes reflected the inhibition on the pyramidal tract duri ng the 'No-go' session.