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Biol Psychol. 2001 Dec;58(3):229-62.

A psychophysiological analysis of inhibitory motor control in the stop-signal paradigm.

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Department of Psychology, University of Amsterdam, Roestersstraat 15, 1018 WB, Amsterdam, The Netherlands.


We examined two potential inhibitory mechanisms for stopping a motor response. Participants performed a standard visual two-choice task in which visual stop signals and no-go signals were presented on a small proportion of the trials. Psychophysiological measures were taken during task performance to examine the time course of response activation and inhibition. The results were consistent with a horse race model previously proposed to account for data obtained using a stop-signal paradigm. The pattern of psychophysiological responses was similar on stop-signal and no-go trials suggesting that the same mechanism may initiate inhibitory control in both situations. We found a distinct frontal brain wave suggesting that inhibitory motor control is instigated from the frontal cortex. The results are best explained in terms of a single, centrally located inhibition mechanism. Results are discussed in terms of current neurophysiological knowledge.

[Indexed for MEDLINE]

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