title: Reward speeds up and increases consistency of visual selective attention: a lifespan comparison.
abstract: Children and older adults often show less favorable reward-based learning and decision making, relative to younger adults. It is unknown, however, whether reward-based processes that influence relatively early perceptual and attentional processes show similar lifespan differences. In this study, we investigated whether stimulus-reward associations affect selective visual attention differently across the human lifespan. Children, adolescents, younger adults, and older adults performed a visual search task in which the target colors were associated with either high or low monetary rewards. We discovered that high reward value speeded up response times across all four age groups, indicating that reward modulates attentional selection across the lifespan. This speed-up in response time was largest in younger adults, relative to the other three age groups. Furthermore, only younger adults benefited from high reward value in increasing response consistency (i.e., reduction of trial-by-trial reaction time variability). Our findings suggest that reward-based modulations of relatively early and implicit perceptual and attentional processes are operative across the lifespan, and the effects appear to be greater in adulthood. The age-specific effect of reward on reducing intraindividual response variability in younger adults likely reflects mechanisms underlying the development and aging of reward processing, such as lifespan age differences in the efficacy of dopaminergic modulation. Overall, the present results indicate that reward shapes visual perception across different age groups by biasing attention to motivationally salient events.
authors.affiliation: Department of Psychology, Vision Sciences Laboratory, Harvard University, Cambridge, USA, vstormer@fas.harvard.edu.
authors.forename: Viola
authors.initials: V
authors.lastname: Störmer
authors.forename: Ben
authors.initials: B
authors.lastname: Eppinger
authors.forename: Shu-Chen
authors.initials: SC
authors.lastname: Li
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000375:Aging; D001288:Attention / Q000502:physiology*; D002648:Child; D003118:Color Perception; D003657:Decision Making / Q000502:physiology*; D005260:Female; D064368:Healthy Volunteers; D006801:Humans; D008297:Male; D008570:Memory, Short-Term / Q000502:physiology; D008875:Middle Aged; D010775:Photic Stimulation; D011930:Reaction Time / Q000502:physiology*; D012201:Reward; D055815:Young Adult
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