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

van Vugt, M. K., Simen, P., Nystrom, L., Holmes, P. & Cohen, J. D., 13-Mar-2014, In : PLoS ONE. 9, 3, 13 p., e90943.

Research output: Contribution to journalArticleAcademicpeer-review

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. © 2014 van Vugt et al.
Original languageEnglish
Article numbere90943
Number of pages13
JournalPLoS ONE
Volume9
Issue number3
Publication statusPublished - 13-Mar-2014

    Keywords

  • REACTION-TIME TASKS, DORSOLATERAL PREFRONTAL CORTEX, PERCEPTUAL DECISION, ELECTROPHYSIOLOGICAL EVIDENCE, DIFFUSION-MODEL, CHOICE TASKS, HUMAN BRAIN, REWARD RATE, COMPUTATIONS
Related Publications
  1. Correction: Lateralized Readiness Potentials Reveal Properties of a Neural Mechanism for Implementing a Decision Threshold

    van Vugt, M. K., Simen, P., Nystrom, L., Holmes, P. & Cohen, J. D., 30-Jun-2015, In : PLoS ONE. 10, 6, p. e0132197

    Research output: Contribution to journalArticleAcademicpeer-review

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