Lateralized readiness potentials reveal properties of a neural mechanism for implementing a decision threshold

Title:
Lateralized readiness potentials reveal properties of a neural mechanism for implementing a decision threshold
Authors:
Van Vugt, Marieke K.; Simen, Patrick; Nystrom, Leigh; Holmes, Philip; Cohen, Jonathan D.
Abstract:
Many perceptual decision making models posit that participants accumulate noisy evidence over time to improve the accuracy of their decisions, and that in free response tasks, participants respond when the accumulated evidence reaches a decision threshold. Research on the neural correlates of these models' components focuses primarily on evidence accumulation. Far less attention has been paid to the neural correlates of decision thresholds, reflecting the final commitment to a decision. Inspired by a model of bistable neural activity that implements a decision threshold, we reinterpret human lateralized readiness potentials (LRPs) as reflecting the crossing of a decision threshold. Interestingly, this threshold crossing preserves signatures of a drift-diffusion process of evidence accumulation that feeds in to the threshold mechanism. We show that, as our model predicts, LRP amplitudes and growth rates recorded while participants performed a motion discrimination task correlate with individual differences in behaviorally-estimated prior beliefs, decision thresholds and evidence accumulation rates. As such LRPs provide a useful measure to test dynamical models of both evidence accumulation and decision commitment processes non-invasively.
Citation:
Van Vugt, M., P. Simen, L. Nystrom, P. Holmes, and J.D. Cohen. 2014. "Lateralized readiness potentials reveal properties of a neural mechanism for implementing a decision threshold." PLoS One, 9(3): e90943.
Publisher:
Public Library of Science
DATE ISSUED:
2014
Department:
Neuroscience
Type:
Article
PUBLISHED VERSION:
10.1371/journal.pone.0090943
PERMANENT LINK:
http://hdl.handle.net/11282/566843

Full metadata record

DC FieldValue Language
dc.contributor.authorVan Vugt, Marieke K.en
dc.contributor.authorSimen, Patricken
dc.contributor.authorNystrom, Leighen
dc.contributor.authorHolmes, Philipen
dc.contributor.authorCohen, Jonathan D.en
dc.date.accessioned2015-08-13T10:35:21Zen
dc.date.available2015-08-13T10:35:21Zen
dc.date.issued2014en
dc.identifier.citationVan Vugt, M., P. Simen, L. Nystrom, P. Holmes, and J.D. Cohen. 2014. "Lateralized readiness potentials reveal properties of a neural mechanism for implementing a decision threshold." PLoS One, 9(3): e90943.en
dc.identifier.issn1932-6203en
dc.identifier.urihttp://hdl.handle.net/11282/566843en
dc.description.abstractMany perceptual decision making models posit that participants accumulate noisy evidence over time to improve the accuracy of their decisions, and that in free response tasks, participants respond when the accumulated evidence reaches a decision threshold. Research on the neural correlates of these models' components focuses primarily on evidence accumulation. Far less attention has been paid to the neural correlates of decision thresholds, reflecting the final commitment to a decision. Inspired by a model of bistable neural activity that implements a decision threshold, we reinterpret human lateralized readiness potentials (LRPs) as reflecting the crossing of a decision threshold. Interestingly, this threshold crossing preserves signatures of a drift-diffusion process of evidence accumulation that feeds in to the threshold mechanism. We show that, as our model predicts, LRP amplitudes and growth rates recorded while participants performed a motion discrimination task correlate with individual differences in behaviorally-estimated prior beliefs, decision thresholds and evidence accumulation rates. As such LRPs provide a useful measure to test dynamical models of both evidence accumulation and decision commitment processes non-invasively.en
dc.language.isoen_USen
dc.publisherPublic Library of Scienceen
dc.identifier.doi10.1371/journal.pone.0090943en
dc.subject.departmentNeuroscienceen
dc.titleLateralized readiness potentials reveal properties of a neural mechanism for implementing a decision thresholden
dc.typeArticleen
dc.identifier.journalPLoS Oneen
dc.subject.keywordReaction-time tasksen_US
dc.subject.keywordDorsolateral prefrontal cortexen_US
dc.subject.keywordPerceptual decisionen_US
dc.subject.keywordElectrophysiological evidenceen_US
dc.subject.keywordPrior probabilityen_US
dc.subject.keywordDiffusion-modelen_US
dc.subject.keywordChoice tasksen_US
dc.subject.keywordHuman brainen_US
dc.subject.keywordReward rateen_US
dc.identifier.volume9en
dc.identifier.issue3en
dc.identifier.startpagee90943en
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