Depression in Parkinson's disease: An investigation of learned helplessness and illusion of control
AuthorBortz, Jennifer Jean, 1956-
AdvisorKaszniak, A. W.
MetadataShow full item record
PublisherThe University of Arizona.
RightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract23 patients with idiopathic Parkinson's disease (PD) and 22 healthy control subjects participated in an experimental investigation of learned helplessness and illusion-of-control phenomena. Subjects were divided into depressed and non-depressed groups according to scores on the Beck Depression Inventory. Each completed four problems associated with an instrumental learning task in which they judged the degree of control their responses exerted over repeated green-light onset. Degree of contingency varied from 0% to 75% and subjects utilized both verbal and motor response modes. Subjects also estimated frequency of green light onsets for each problem. Contrary to expectation, PD subjects did not differ from relevant comparison groups in their contingency or frequency estimates. Tests of the prediction that depressed subjects' contingency ratings would be more accurate than non-depressives' approached significance (p < .064), although the pattern of mean differences was not consistent with an illusion-of-control interpretation.
Degree ProgramGraduate College