Monkeys (Macacca fascicularis) were tested for their ability to perform learned, self-initiated arm movements for reward, both before and after receiving bilateral putamen lesions. The rate at which they made the movements was significantly reduced postoperatively, but their performance on a visually cued control task was normal. It is argued that the impairment was not a consequence of poor motor control or motivation, but that it reflected a reduced capacity to recall learned movements in t...Expand abstract
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The striatum and self-paced movements.
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