title: Cognitive strategies and hypothesis testing during discrimination learning in Parkinson's disease.
abstract: This study investigated the nature and extent of impairments in the use of hypotheses and cognitive strategies in medicated subjects with idiopathic Parkinson's disease (PD) and matched control subjects. PD subjects did not differ from controls in solving one- or two-dimensional discrimination learning problems, but showed impairment on four-dimensional problems which did not appear to be attributable to memory deficits. They achieved fewer correct solutions, used fewer hypotheses, and were less likely to use appropriate lose-shift strategies following negative feedback. The pattern of findings was similar to those previously reported for subjects with frontal lobe lesions.
authors.affiliation: Department of Psychiatry, University College and Middlesex School of Medicine, London, U.K.
authors.forename: S
authors.initials: S
authors.lastname: Channon
authors.forename: M C
authors.initials: MC
authors.lastname: Jones
authors.forename: S
authors.initials: S
authors.lastname: Stephenson
mesh_terms: D000368:Aged; D003071:Cognition / Q000502:physiology*; D004193:Discrimination Learning / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010300:Parkinson Disease / Q000503:physiopathology / Q000523:psychology*; D011581:Psychological Tests; D013647:Task Performance and Analysis