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Related Experiment Videos

Discrete stochastic process underlying perceptual rivalry.

Tsutomu Murata1, Nobuyuki Matsui, Satoru Miyauchi

  • 1Kansai Advanced Research Center, Communications Research Laboratory, Iwaoka, Kobe-shi, Hyogo 651-2492, Japan. benmura@po.crl.go.jp

Neuroreport
|July 24, 2003
PubMed
Summary
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Perceptual rivalry, like binocular rivalry, involves alternating conscious perceptions. This study reveals that the timing of these alternations follows a specific mathematical pattern, suggesting a discrete stochastic process underlies this phenomenon.

Area of Science:

  • Cognitive Neuroscience
  • Computational Neuroscience
  • Psychophysics

Background:

  • Perceptual rivalry involves spontaneous alternations between two interpretations of unchanging stimuli.
  • Previous research established that alternation intervals follow a gamma distribution (GD).
  • The underlying mechanism driving these alternations remained unclear.

Purpose of the Study:

  • To investigate the mathematical properties of the gamma distribution (GD) fitted to perceptual rivalry alternation intervals.
  • To elucidate the stochastic mechanisms responsible for perceptual rivalry.

Main Methods:

  • Quantitative analysis of GDs fitted to measured alternation intervals.
  • Examination of the shape-determining parameter (alpha) of the fitted GDs.

Related Experiment Videos

Main Results:

  • The shape-determining parameter (alpha) of the gamma distributions consistently yielded natural numbers.
  • Gamma distributions with natural number alpha are mathematically derivable from discrete stochastic processes, specifically the Poisson process.

Conclusions:

  • The findings suggest a discrete stochastic process underlies perceptual rivalry.
  • The alpha-time accumulation of discrete events is proposed as the mechanism driving perceptual alternations.