Effects of judgement process on motor evoked potentials in Go/No-go hand movement task.

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