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Shape contrast: a global mechanism?

Katinka van der Kooij1, Susan F te Pas

  • 1Experimental Psychology, Helmholtz Institute, Universiteit Utrecht, Utrecht, The Netherlands. katinkavanderkooij@gmail.com

Vision Research
|September 15, 2010
PubMed
Summary
This summary is machine-generated.

Shape perception relies on global visual cues, not just local contrast. A global mechanism, likely divisive normalization, explains shape contrast bias in visual processing.

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Area of Science:

  • Visual perception
  • Computational neuroscience
  • Psychophysics

Background:

  • The mechanisms underlying shape contrast bias are debated.
  • It remains unclear if bias arises from local or global visual processing.

Purpose of the Study:

  • To determine if shape contrast bias is mediated by local contrast enhancement or a global mechanism.
  • To investigate the influence of surrounding visual information on shape perception.

Main Methods:

  • Observers performed a shape discrimination task on a central hinged plane.
  • Experimental conditions involved adding surrounding dihedral surfaces with varied dihedral angle distributions.
  • The impact of adjacent and distributed shape information on perception was analyzed.

Main Results:

  • Shape perception was significantly influenced by both adjacent surfaces and the mean dihedral angle distribution in the surround.
  • Findings indicate that shape contrast is not solely determined by local features.

Conclusions:

  • Shape contrast bias is governed by a global mechanism, not local contrast enhancement.
  • Divisive normalization of shape signals is proposed as a potential underlying mechanism for this global processing.