title: Motivational engagement in Parkinson's disease: Preparation for motivated action.
abstract: The current study investigated whether motivational dysfunction in Parkinson's patients is related to a deficit in preparing for motivated behavior. Based on previous studies, it was hypothesized that PD patients would show reduced preparation for action specifically when faced with threat (of loss) and that reduced action preparation would relate to self-report of apathy symptoms. The study measured an electrocortical correlate of preparation for action (CNV amplitude) in PD patients and healthy controls, as well as defensive and appetitive activation during emotional perception (LPP amplitude). The sample included 18 non-demented PD patients (tested on dopaminergic medications) and 15 healthy controls who responded as quickly as possible to cues signaling threat of loss or reward, in which the speed of the response determined the outcome. Results indicated that, whereas PD patients showed similar enhanced action preparation with the addition of incentives to controls, PD patients showed generally reduced action preparation, evidenced by reduced CNV amplitude overall. Results suggest that PD patients may have behavioral issues due to globally impaired action preparation but that this deficit is not emotion-specific, and movement preparation may be aided by incentive in PD patients.
authors.affiliation: Department of Clinical and Health Psychology, University of Florida, PO Box 100165, Gainesville, FL 32610, United States; NIMH Center for the Study of Emotion and Attention, University of Florida, Gainesville, FL 32611, United States. Electronic address: jenna.renfroe.phd@gmail.com.
authors.forename: J B
authors.initials: JB
authors.lastname: Renfroe
authors.affiliation: NIMH Center for the Study of Emotion and Attention, University of Florida, Gainesville, FL 32611, United States.
authors.forename: M M
authors.initials: MM
authors.lastname: Bradley
authors.affiliation: Center for Movement Disorders and Neurorestoration, University of Florida, United States.
authors.forename: M S
authors.initials: MS
authors.lastname: Okun
authors.affiliation: Department of Clinical and Health Psychology, University of Florida, PO Box 100165, Gainesville, FL 32610, United States.
authors.forename: D
authors.initials: D
authors.lastname: Bowers
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D059031:Anticipation, Psychological / Q000502:physiology*; D004569:Electroencephalography / Q000379:methods; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009042:Motivation / Q000502:physiology*; D010300:Parkinson Disease / Q000175:diagnosis / Q000503:physiopathology* / Q000523:psychology*; D010775:Photic Stimulation / Q000379:methods; D011930:Reaction Time / Q000502:physiology
keywords: CNV; Incentive; LPP; Motivation; Motor preparation; Parkinson's