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The functional role of serial dependence.

Guido Marco Cicchini1, Kyriaki Mikellidou2,3, David C Burr4,5,6

  • 1Institute of Neuroscience, National Research Council (CNR), Pisa, Italy.

Proceedings. Biological Sciences
|November 2, 2018
PubMed
Summary

The brain uses serial dependence to improve visual perception by integrating past information with current stimuli. This strategy optimizes responses, especially for less reliable visual input, leading to faster reaction times.

Keywords:
BayesianKalman filteroptimal behaviourorientationserial dependence

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Area of Science:

  • Cognitive Neuroscience
  • Computational Vision
  • Psychophysics

Background:

  • Natural scenes exhibit strong serial correlations, suggesting the brain may leverage these regularities.
  • Previous research indicates the brain is sensitive to serial correlations, causing response drifts towards prior stimuli.
  • The functional advantage of this serial dependence remains unclear.

Purpose of the Study:

  • To test a formal model of optimal serial dependence in visual perception.
  • To investigate how stimulus reliability and similarity influence serial dependence.
  • To determine if serial dependence confers a functional advantage beyond reproduction accuracy.

Main Methods:

  • Developed and tested a formal model of optimal serial dependence.
  • Conducted an orientation reproduction task with varying stimulus reliability (e.g., low spatial frequency Gabors).
  • Analyzed the relationship between serial dependence, stimulus reliability, stimulus similarity, and response times.

Main Results:

  • Serial dependence was strongest for less reliable stimuli, such as low spatial frequency oblique Gabors.
  • Serial dependence increased with the similarity between successive stimuli, aligning with ideal observer predictions.
  • Serial dependence was associated with faster response times, suggesting benefits beyond error reduction.

Conclusions:

  • Serial dependence plays a beneficial role in visual perception by exploiting temporal redundancy.
  • The brain's sensitivity to serial correlations is an optimization strategy for processing visual scenes.
  • Serial dependence enhances perceptual efficiency and accuracy, particularly under challenging viewing conditions.