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Perceptual decisions and confidence judgments are linked. Setting evidence accumulation bounds for decisions predicts confidence accuracy, even when evidence exposure is limited.

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Area of Science:

  • Cognitive Neuroscience
  • Decision Science

Background:

  • Perceptual decisions are often accompanied by subjective confidence.
  • Confidence is thought to reflect the decision-maker's belief in their accuracy.

Purpose of the Study:

  • To investigate the relationship between perception and confidence.
  • To examine how confidence judgments are regulated in relation to perceptual evidence accumulation.

Main Methods:

  • Human observers performed a visual stimulus categorization task with sequential evidence.
  • Evidence accumulation bounds for decision-making were manipulated and observed.
  • Behavioral data and pupil dilation were recorded to assess decision processes.

Main Results:

  • The ability to set appropriate evidence accumulation bounds strongly predicted accurate confidence judgments.
  • When evidence exposure was not controlled, observers used covert bounds for decisions but not confidence.
  • A partial dissociation between decision and confidence bounds was observed, reflected in behavior and pupil dilation.

Conclusions:

  • Confidence is regulated by an accumulation-to-bound process that influences perceptual decision-making.
  • This process operates even without explicit speed-accuracy trade-offs.
  • Findings suggest a unified mechanism for decision and confidence regulation.