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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 the absence of external cues. The results complement similar findings for monkeys with supplementary motor cortex (SMA) lesions; the putamen is interconnected with the SMA in a cortico-striatal-thalamocortical loop.

Type

Journal article

Journal

Behav Neurosci

Publication Date

06/1998

Volume

112

Pages

719 - 724

Keywords

Animals, Arm, Conditioning, Operant, Cues, Disease Models, Animal, Efferent Pathways, Macaca fascicularis, Male, Mental Recall, Motor Cortex, Motor Skills, Parkinson Disease, Putamen, Time and Motion Studies, Videotape Recording, Volition