Cited by 494Neural and Behavioral Psychology StudiesDecision-Making and Behavioral EconomicsVisual perception and processing mechanisms

Choice Certainty Is Informed by Both Evidence and Decision Time

Open access
Kiani, Roozbeh, Corthell, Leah, Shadlen, Michael N.·2014·Neuron

Abstract

"Degree of certainty" refers to the subjective belief, prior to feedback, that a decision is correct. A reliable estimate of certainty is essential for prediction, learning from mistakes, and planning subsequent actions when outcomes are not immediate. It is generally thought that certainty is informed by a neural representation of evidence at the time of a decision. Here we show that certainty is also informed by the time taken to form the decision. Human subjects reported simultaneously their choice and confidence about the direction of a noisy display of moving dots. Certainty was inversely correlated with reaction times and directly correlated with motion strength. Moreover, these correlations were preserved even for error responses, a finding that contradicts existing explanations of certainty based on signal detection theory. We also contrived a stimulus manipulation that led to longer decision times without affecting choice accuracy, thus demonstrating that deliberation time itself informs the estimate of certainty. We suggest that elapsed decision time informs certainty because it serves as a proxy for task difficulty.

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Crossref · 10.1016/j.neuron.2014.12.015

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  • People may hold a belief that faster decisions are more likely to be accurate and use feelings of fluency to inform their confidence estimates.

    “For instance, we may hold a belief that faster decisions are more likely to be accurate and use these feelings of fluency to inform our confidence estimates (Kiani et al. 2014).”

    From Metacognition and Confidence: A Review and Synthesis (2024) · cites this paper as Kiani et al. 2014

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Authors
Kiani, R., Corthell, L., & Shadlen, M. N.
Affiliations
  • New York University (US)
  • University of Alabama at Birmingham (US)
  • Howard Hughes Medical Institute (US)
Corresponding author
Kiani, Roozbeh
Venue
Neuron
Publisher
Elsevier BV
Published
2014-12
Volume
84
Issue
6
Pages
1329-1342
ISSN
0896-6273 (ISSN-L)
OpenAlex
W2101518352
Cited by
470
References
79
Citations by year
2026: 38 · 2025: 42 · 2024: 42 · 2023: 45 · 2022: 45 · 2021: 47 · 2020: 45 · 2019: 37 · 2018: 39 · 2017: 37 · 2016: 38 · 2015: 13 · 2014: 1
FWCI
15.19
Type
journal article
Language
en
Open access
Locations
  • Neuron (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Howard Hughes Medical Institute
  • University of Washington
  • National Eye Institute (EY11378, R01EY011378, P30EY013079)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
  • Social Sciences › Decision Sciences › General Decision Sciences › Decision-Making and Behavioral Economics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
Keywords
decision confidence, decision time, evidence accumulation, reaction time, motion direction discrimination, signal detection theory, error response, task difficulty, deliberation
MeSH terms
Choice Behavior, Eye Movements, Female, Humans, Motion Perception, Photic Stimulation, Reaction Time, Uncertainty, Young Adult

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