Abstract
This chapter discusses slow potentials related to initiation and inhibition of proprioceptively guided movements. Accuracy of response time is defined by an interval window after a self-initiated visual trace on an oscilloscope. The trace is initiated by button press in one hand and terminated by button press in the other hand. This positive potential is independent of the amplitude of the readiness potential and absent when the response occurred without visual feedback. The briefest possible summary of the picture which has emerged from these and many other studies suggests the following: when simple self-paced movements are studied a readiness potential is observed, the distribution of which is similar to that observed during ballistic movements. The amplitude of readiness potentials is related to complexity or difficulty of the movement to be performed; these relationships being more evident over central than over parietal areas and greatest in the hemisphere contralateral to the responding hand.
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