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Related Experiment Videos

Occupancy model of perceived numerosity.

J Allik1, T Tuulmets

  • 1Department of Psychology, University of Tartu, Estonia, U.S.S.R.

Perception & Psychophysics
|April 1, 1991
PubMed
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The occupancy model explains how people perceive the number of dots in a pattern. It suggests that perceived numerosity is based on the total area occupied by dots, not just their count.

Area of Science:

  • Visual Perception
  • Cognitive Psychology
  • Psychophysics

Background:

  • Human perception of numerosity is complex and can be prone to illusions.
  • Previous models have struggled to quantitatively explain all observed numerosity phenomena.

Purpose of the Study:

  • To propose and test a novel quantitative model for visual numerosity perception.
  • To explain how observers judge the relative number of elements in dot patterns.

Main Methods:

  • Participants viewed 234 pairs of stochastically organized dot patterns.
  • Observers indicated which pattern appeared more numerous.
  • Data were analyzed using the proposed occupancy model.

Main Results:

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  • The occupancy model accurately accounted for all observed data.
  • Perceived numerosity was determined by the total area occupied by dots within a constant radius.
  • The pattern with the larger calculated occupancy index was consistently chosen as more numerous.

    • Conclusions:

    • The occupancy model provides a robust quantitative explanation for numerosity perception.
    • This model successfully explains known numerosity illusions and puzzling perceptual phenomena.