Perceptual learning alters post-sensory processing in human decision making

Diaz, J. A., Queirazza, F. and Philiastides, M. G. (2017) Perceptual learning alters post-sensory processing in human decision making. Nature Human Behaviour, 1, 0035. (doi:10.1038/s41562-016-0035)

[img]
Preview
Text
132551.pdf - Accepted Version

4MB

Abstract

An emerging view in perceptual learning is that improvements in perceptual sensitivity are not only due to enhancements in early sensory representations but also due to changes in post-sensory decision-processing. In humans, however, direct neurobiological evidence of the latter remains scarce. Here, we trained participants on a visual categorization task over three days and used multivariate pattern analysis of the electroencephalogram to identify two temporally specific components encoding sensory (‘Early’) and decision (‘Late’) evidence, respectively. Importantly, the single-trial amplitudes of the Late, but not the Early component, were amplified in the course of training, and these enhancements predicted the behavioural improvements on the task. Correspondingly, we modelled these improvements with a reinforcement learning mechanism, using a reward prediction error signal to strengthen the readout of sensory evidence used for the decision. We validated this mechanism through a robust association between the model’s decision variables and the amplitudes of our Late component that encode decision evidence.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Queirazza, Dr Filippo and Philiastides, Dr Marios and Diaz, Jessica
Authors: Diaz, J. A., Queirazza, F., and Philiastides, M. G.
College/School:College of Medical Veterinary and Life Sciences > Institute of Neuroscience and Psychology
Journal Name:Nature Human Behaviour
Publisher:Nature Publishing Group
ISSN:2397-3374
ISSN (Online):2397-3374
Published Online:30 January 2017
Copyright Holders:Copyright © 2017 Macmillan Publishers Limited, part of Springer Nature
First Published:First published in Nature Human Behaviour 1: 0035
Publisher Policy:Reproduced in accordance with the publisher copyright policy

University Staff: Request a correction | Enlighten Editors: Update this record

Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
654411Neural correlates of learning and confidence during decision making and their utility in developing "intelligent technologies".Marios PhiliastidesEconomic & Social Research Council (ESRC)ES/L012995/1INP - CENTRE FOR COGNITIVE NEUROIMAGING