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Twenty-four Parkinsonism patients were compared with `normal controls' and with another chronically disabled group, matched for age, sex distribution, and socioeconomic background, on measures of depression and some intellectual factors. A tendency to depression in the Parkinsonism sufferers was demonstrated together with an apparent specific intellectual deficit, for which a cause related to the motor disabilities of the disease is postulated.
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Sarah R. Horn (1974) studied this question.
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