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Related Experiment Videos

Is memory for stimulus magnitude Bayesian?

Kevin M Sailor1, Miriam Antoine

  • 1Psychology Department, Lehman College, 250 Bedford Park Blvd. West, Bronx, NY 10468, USA. kevin.sailor@lehman.cuny.edu

Memory & Cognition
|December 31, 2005
PubMed
Summary

Memory recall is not a simple Bayesian weighting of stimulus and category. Instead, reproductions were biased toward the overall average, suggesting memory construction is more complex than previously thought.

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Area of Science:

  • Cognitive Psychology
  • Memory Research
  • Perceptual Learning

Background:

  • Theories of memory suggest recall may involve Bayesian weighting of stimulus magnitude and category central tendency.
  • Previous models proposed memory is constructed from long-run probabilities of category membership.

Purpose of the Study:

  • To investigate if memory for stimulus values follows a Bayesian weighting model.
  • To examine how category information and stimulus magnitude influence memory recall.

Main Methods:

  • Five experiments were conducted using geometric figures from two distinct size categories.
  • Participants reproduced the remembered size of presented stimuli.
  • Data analysis focused on biases in reproduction toward category means and stimulus distributions.

Main Results:

  • Memory reproductions were biased toward the mean of the combined stimulus distribution, not individual category means.
  • The size of the stimulus from the preceding trial significantly influenced current reproductions.
  • These findings challenge the notion of memory as a simple construction from category probabilities.

Conclusions:

  • Memory recall for stimulus values is not solely a Bayesian weighting of stimulus magnitude and category central tendency.
  • Memory construction appears to be influenced by broader distributional information and sequential trial effects.
  • Existing models may need revision to account for these observed biases in memory recall.

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