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Related Experiment Videos

A large rectangle delays the perception of a separate small rectangle.

D L King1

  • 1Department of Psychology, Howard University, Washington, DC 20059.

Perception & Psychophysics
|April 1, 1990
PubMed
Summary

Perceptual decision-making is slower when distinguishing between large and small rectangles compared to same-sized ones. This "large-small slowdown" suggests the dominant large rectangle inhibits the perception of the smaller one.

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Area of Science:

  • Cognitive Psychology
  • Visual Perception

Background:

  • The perception of object numerosity (whether one or two objects are present) can be influenced by object properties.
  • Previous research indicates that visual processing can be affected by the relative sizes of objects within a display.

Purpose of the Study:

  • To investigate the perceptual mechanisms underlying the slower decision-making when discriminating between large-small and small-large rectangle pairs versus same-sized pairs.
  • To determine the role of superordinate codes and inhibition in visual perception of object size and numerosity.

Main Methods:

  • Participants performed tasks requiring them to decide if one or two rectangles were present.
  • Stimuli included pairs of rectangles varying in size (large-small, small-large, large-large, small-small).
  • Experimental manipulations included modifying the large rectangle, making rectangles contiguous, and varying the identification task (identify large vs. identify small).

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Main Results:

  • A significant slowdown in decision time was observed for large-small and small-large pairs compared to same-sized pairs.
  • This slowdown was eliminated when the large rectangle was modified, rectangles were contiguous, or the task was to identify the large rectangle.
  • The slowdown persisted when the task was to identify the small rectangle.

Conclusions:

  • The findings suggest that the perception of a large rectangle can actively inhibit the perception of a simultaneously presented small rectangle.
  • This inhibition is mediated by superordinate codes, where the code for the large rectangle interferes with the code for the small rectangle.
  • Superordinate codes may play a crucial role in the formation of gestalts and influence various perceptual outcomes.