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Research on psychomotor slowing in aged and brain-damaged subjects is reviewed. An attempt is made to identify brain mechanisms related to this slowing. Behavioral, neuroanatomical, and neurophysiological evidence indicate that the basal ganglia with their complex neural connections are importantly involved in the speed of initiating and executing movements. Damage or dysfunction of the basal ganglia may be a basis for the psychomotor slowness observed in human and animal subjects.

Five groups of rats were given 0, 25, 50, 75, and 100 overtraining trials in a T-maze to determine the effects on the acquisition and reversal of place and response habits. Increasing overtraining produced more response than place learners, but there was no facilitative effect in reversal learning with increased overtraining, nor was there a differential effect on the ease of reversal of place or response learning.

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