Reward selectively modulates the lingering neural representation of recently attended objects in natural scenes

Research output: Contribution to journalArticle

Authors

Abstract

Theories of reinforcement learning and approach behavior suggest that reward can increase the perceptual salience of environmental stimuli, ensuring that potential predictors of outcome are noticed in the future. However, outcome commonly follows visual processing of the environment, occurring even when potential reward cues have long disappeared. How can reward feedback retroactively cause now-absent stimuli to become attention-drawing in the future? One possibility is that reward and attention interact to prime lingering visual representations of attended stimuli that sustain through the interval separating stimulus and outcome. Here, we test this idea using multivariate pattern analysis of fMRI data collected from male and female humans. While in the scanner, participants searched for examples of target categories in briefly presented pictures of cityscapes and landscapes. Correct task performance was followed by reward feedback that could randomly have either high or low magnitude. Analysis showed that high-magnitude reward feedback boosted the lingering representation of target categories while reducing the representation of nontarget categories. The magnitude of this effect in each participant predicted the behavioral impact of reward on search performance in subsequent trials. Other analyses show that sensitivity to reward—as expressed in a personality questionnaire and in reactivity to reward feedback in the dopaminergic midbrain— predicted reward-elicited variance in lingering target and nontarget representations. Credit for rewarding outcome thus appears to be assigned to the target representation, causing the visual system to become sensitized for similar objects in the future.

Details

Original languageEnglish
Pages (from-to)7297-7304
Number of pages8
JournalJournal of Neuroscience
Volume37
Issue number31
Publication statusPublished - 2 Aug 2017

Keywords

  • Attention, fMRI, Motivation, MVPA, Reward, Visual search

ASJC Scopus subject areas