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Surround modulation of global form perception.

Hsin-Hung Li1, Chien-Chung Chen

  • 1Department of Psychology, National Taiwan University, Taipei, Taiwan.

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Global form perception is influenced by surrounding visual elements. Specific surround patterns, like concentric and spiral, can hinder the detection of central Glass patterns, demonstrating context-dependent visual processing.

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Area of Science:

  • Visual perception
  • Computational neuroscience
  • Psychophysics

Background:

  • Global form perception relies on integrating local elements like dipoles in Glass patterns.
  • The influence of surrounding visual context on this integration process is not fully understood.

Purpose of the Study:

  • To investigate how different surround configurations modulate global form perception.
  • To determine the effect of surround Glass patterns on the coherence threshold of central Glass patterns.

Main Methods:

  • Utilized Glass patterns with varying center and surround configurations.
  • Measured coherence thresholds at 75% accuracy for central targets alone and with surrounds.
  • Varied the gap width between center and surround elements.

Main Results:

  • Concentric and spiral surrounds elevated coherence thresholds for concentric targets.
  • Radial surrounds did not affect concentric targets, while spiral surrounds elevated thresholds for radial targets.
  • The surround modulation effect persisted with a blank gap, peaking at an optimal width.

Conclusions:

  • Global form perception is significantly modulated by surround context.
  • The degree of modulation depends on the specific shapes of both the central target and the surround Glass patterns.