Sensory and decision-making processes underlying perceptual adaptation

Journal of Vision
Nathan WitthoftRoozbeh Kiani

Abstract

Perceptual systems adapt to their inputs. As a result, prolonged exposure to particular stimuli alters judgments about subsequent stimuli. This phenomenon is commonly assumed to be sensory in origin. Changes in the decision-making process, however, may also be a component of adaptation. Here, we quantify sensory and decision-making contributions to adaptation in a facial expression paradigm. As expected, exposure to happy or sad expressions shifts the psychometric function toward the adaptor. More surprisingly, response times show both an overall decline and an asymmetry, with faster responses opposite the adapting category, implicating a substantial change in the decision-making process. Specifically, we infer that sensory changes from adaptation are accompanied by changes in how much sensory information is accumulated for the two choices. We speculate that adaptation influences implicit expectations about the stimuli one will encounter, causing modifications in the decision-making process as part of a normative response to a change in context.

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Citations

Aug 18, 2020·Journal of Vision·Andreia VerdadeMiguel Castelo-Branco
May 11, 2019·Scientific Reports·Regan M GallagherDerek H Arnold
Aug 25, 2021·Attention, Perception & Psychophysics·Regan M GallagherDerek H Arnold

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