September 2017
Volume 17, Issue 10
Open Access
Vision Sciences Society Annual Meeting Abstract  |   August 2017
The influence of evidence volatility on choice, reaction time and confidence in a perceptual decision
Author Affiliations
  • Ariel Zylberberg
    Columbia University
Journal of Vision August 2017, Vol.17, 1389. doi:10.1167/17.10.1389
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      Ariel Zylberberg; The influence of evidence volatility on choice, reaction time and confidence in a perceptual decision. Journal of Vision 2017;17(10):1389. doi: 10.1167/17.10.1389.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Many decisions are thought to arise via the accumulation of noisy evidence to a threshold or bound. In perceptual decision-making, the bounded evidence accumulation framework explains the effect of stimulus strength, characterized by signal-to-noise ratio, on decision speed, accuracy and confidence. This framework also makes intriguing predictions about the behavioral influence of the noise itself. An increase in noise should lead to faster decisions, reduced accuracy and, paradoxically, higher confidence. To test these predictions, we introduce a novel sensory manipulation that mimics the addition of unbiased noise to motion-selective regions of visual cortex. We verified the effect of this manipulation with neuronal recordings from macaque areas MT/MST. For both humans and monkeys, increasing the noise induced faster decisions and greater confidence over a range of stimuli for which accuracy was minimally impaired. The magnitude of the effects was in agreement with predictions of a bounded evidence accumulation model.

Meeting abstract presented at VSS 2017

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