Motor perseveration observed in patients with anterior lesions can be clustered into at least four different types, each of which reflects a breakdown at a particular (executive, motor, or semantic) level of cognitive processing. The phenomenology of motor perseveration is used to make inferences about two aspects of normal cognition: hierarchic organization of executive processes, and units for the encoding of visual information.
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Goldberg et al. (1979) studied this question.
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