Neuropsychological evaluation of Parkinsonian subgroups

This study involved the neuropsychological evaluation of Parkinson subgroups, established with clinical ratings in a large sample (N=334) of Parkinson patients. The subgroups were tremor (N=11), rigidity (N=10), and a composite instability subgroup composed of postural instability, gait disturbance, and mental status decline (N=12). Clinical characteristics of the subgroups were not significantly different, except for depression. Bradykinesia had significant correlations which cut across subgroups. [...]