Abstract
The hypothesis was tested that involuntary rest pauses occurring during massed practice on a tapping task would be more numerous for extraverted Ss; significant correlations in the predicted direction were obtained. It was also predicted that involuntary rests would be less numerous under conditions of high drive than under conditions of low drive; support for this hypothesis was suggested by the results of an analysis of covariance, but not at a statistically significant level. As anticipated, high-drive Ss produced a greater number of taps than did low-drive Ss.

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