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The frequency of dementia,the clinical characteristics and the pattern of cognitive impairment were studied in 147 unselected Parkinsonian patients. Twenty-one patients(14.28%)were judged to be demented.They had a more severe and widespread cognitive deficit although they were affected particularly in those tests that already discriminated Parkinsonian patients from controls.A direct comparison of Parkinsonian dementia with other types of dementia is needed to validate the concept of subcortical dementia. |
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