title: Reduced striatal responses to reward prediction errors in older compared with younger adults.
abstract: We examined whether older adults differ from younger adults in how they learn from rewarding and aversive outcomes. Human participants were asked to either learn to choose actions that lead to monetary reward or learn to avoid actions that lead to monetary losses. To examine age differences in the neurophysiological mechanisms of learning, we applied a combination of computational modeling and fMRI. Behavioral results showed age-related impairments in learning from reward but not in learning from monetary losses. Consistent with these results, we observed age-related reductions in BOLD activity during learning from reward in the ventromedial PFC. Furthermore, the model-based fMRI analysis revealed a reduced responsivity of the ventral striatum to reward prediction errors during learning in older than younger adults. This age-related reduction in striatal sensitivity to reward prediction errors may result from a decline in phasic dopaminergic learning signals in the elderly.
authors.affiliation: Princeton Neuroscience Institute, Green Hall, Princeton University, Princeton, New Jersey 08544, USA. eppinger@mpib-berlin.mpg.de
authors.forename: Ben
authors.initials: B
authors.lastname: Eppinger
authors.forename: Nicolas W
authors.initials: NW
authors.lastname: Schuck
authors.forename: Leigh E
authors.initials: LE
authors.lastname: Nystrom
authors.forename: Jonathan D
authors.initials: JD
authors.lastname: Cohen
mesh_terms: D000328:Adult; D000368:Aged; D000375:Aging / Q000502:physiology*; D000704:Analysis of Variance; D001931:Brain Mapping; D003342:Corpus Striatum / Q000098:blood supply / Q000502:physiology*; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007858:Learning / Q000502:physiology*; D008279:Magnetic Resonance Imaging; D008297:Male; D010100:Oxygen / Q000097:blood; D010775:Photic Stimulation; D011237:Predictive Value of Tests; D011594:Psychometrics; D011930:Reaction Time; D012201:Reward; D013223:Statistics as Topic; D011795:Surveys and Questionnaires; D013997:Time Factors
chemical_list: D010100:Oxygen