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The effect of Parkinson's disease on the ability to maintain a mental set.
  1. K A Flowers,
  2. C Robertson


    In two experiments with an Odd-Man-Out choice discrimination task, Parkinsonian subjects had difficulty in alternating between two rules on successive trials. The pattern of errors suggested that the difficulty arises from an instability of cognitive set rather than any loss of reasoning ability, perseveration or increased distractibility.

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