Format

Send to

Choose Destination
NPJ Parkinsons Dis. 2015 Dec 17;1:15026. doi: 10.1038/npjparkd.2015.26.

Reduced pupillary reward sensitivity in Parkinson's disease.

Author information

1
Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, UK.

Abstract

Abnormalities in reward processing may be a critical part of understanding nonmotor manifestations of Parkinson's disease (PD). Dysfunction in dopaminergic pathways, which signal upcoming rewards, might result in altered motivation by incentives. To examine this proposal, we studied 16 patients with PD, both ON and OFF their normal dopaminergic medication, comparing them with healthy controls. Participants performed a speeded saccade task to obtain monetary rewards. Crucially, we manipulated the reward available from trial to trial, by presenting an auditory incentive precue before each saccade. The effects of incentives on pupil dilatation (an index of autonomic response) were measured. Individuals with PD showed diminished autonomic reward effects, compared with age-matched controls. When tested ON medication, pupil responses to reward increased, demonstrating that dopaminergic drugs can restore reward sensitivity. These findings reveal blunted autonomic responses to incentives in PD, which can be modulated by dopaminergic drugs.

Conflict of interest statement

Competing Interests The authors declare no conflict of interest.

Supplemental Content

Full text links

Icon for PubMed Central
Loading ...
Support Center