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Individual differences in response precision correlate with adaptation bias.

Marcelo G Mattar1,2, Marie V Carter3, Marc S Zebrowitz3

  • 1Department of Psychology, University of Pennsylvania, Philadelphia, PA, USA.

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Perceptual bias, the tendency to estimate stimuli away from recent experiences (adaptation), was studied. Poorer representational precision correlated with greater bias, supporting Bayesian models of perception.

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Area of Science:

  • Cognitive Psychology
  • Computational Neuroscience
  • Perception and Representation

Background:

  • Internal stimulus representation is imprecise and prone to bias.
  • Noise during encoding and maintenance degrades representational precision.
  • Adaptation causes stimulus estimation bias away from recent stimuli.

Purpose of the Study:

  • To test the Bayesian prediction that poorer representational precision leads to greater perceptual bias.
  • To investigate individual differences in the relationship between bias and precision.

Main Methods:

  • Online experiment with 202 subjects performing face and color matching tasks.
  • Tasks included immediate match, delayed match-to-sample, and delayed match after adaptation.
  • Bias and precision were quantified, controlling for random guesses.

Main Results:

  • Adaptation successfully induced response bias, with significant individual differences in magnitude.
  • A negative correlation was found between mean precision and bias across subjects.
  • This finding was replicated in a second experiment with 192 subjects.

Conclusions:

  • Results support Bayesian observer models where perceptual representation precision modulates bias magnitude.
  • Individual differences in representational precision are linked to susceptibility to perceptual biases like adaptation.