Temporal characteristics of the influence of punishment on perceptual decision making in the human brain

Blank, H., Guido, B., Heekeren, H.R. and Philiastides, M.G. (2013) Temporal characteristics of the influence of punishment on perceptual decision making in the human brain. Journal of Neuroscience, 33(9), pp. 3939-3952. (doi: 10.1523/JNEUROSCI.4151-12.2013)

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Perceptual decision making is the process by which information from sensory systems is combined and used to influence our behavior. In addition to the sensory input, this process can be affected by other factors, such as reward and punishment for correct and incorrect responses. To investigate the temporal dynamics of how monetary punishment influences perceptual decision making in humans, we collected electroencephalography (EEG) data during a perceptual categorization task whereby the punishment level for incorrect responses was parametrically manipulated across blocks of trials. Behaviorally, we observed improved accuracy for high relative to low punishment levels. Using multivariate linear discriminant analysis of the EEG, we identified multiple punishment-induced discriminating components with spatially distinct scalp topographies. Compared with components related to sensory evidence, components discriminating punishment levels appeared later in the trial, suggesting that punishment affects primarily late postsensory, decision-related processing. Crucially, the amplitude of these punishment components across participants was predictive of the size of the behavioral improvements induced by punishment. Finally, trial-by-trial changes in prestimulus oscillatory activity in the alpha and gamma bands were good predictors of the amplitude of these components. We discuss these findings in the context of increased motivation/attention, resulting from increases in punishment, which in turn yields improved decision-related processing.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Philiastides, Professor Marios
Authors: Blank, H., Guido, B., Heekeren, H.R., and Philiastides, M.G.
College/School:College of Medical Veterinary and Life Sciences > School of Psychology & Neuroscience
Journal Name:Journal of Neuroscience
Publisher:The Society for Neuroscience
ISSN (Online):1529-2401
Copyright Holders:Copyright © 2013 The Authors
First Published:First published in Journal of Neuroscience 33(9):3939-3952
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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