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Multiple gain control processes in contrast-contrast phenomena.

L A Olzak1, P I Laurinen

  • 1Department of Psychology, Miami University of Ohio, Oxford 45056, USA. olzakla@muohio.edu

Vision Research
|April 5, 2000
PubMed
Summary
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Visual perception involves complex gain control mechanisms. This study reveals two distinct gain control processes influencing contrast perception, one orientation-tuned and phase-dependent, the other pooling across orientations.

Area of Science:

  • Visual Neuroscience
  • Perception Psychology
  • Computational Neuroscience

Background:

  • Center-surround interactions are crucial for visual processing, particularly contrast perception.
  • Orientation-tuned gain control mechanisms are hypothesized to underlie these phenomena.

Purpose of the Study:

  • To investigate the contributions of different gain control processes to center-surround contrast phenomena.
  • To differentiate between orientation-specific and orientation-pooling gain control mechanisms.

Main Methods:

  • Measured apparent contrast of a central disk surrounded by modulated patterns.
  • Varied spatial frequency, phase, and orientation of center and surround stimuli.
  • Used psychophysical methods comparing apparent contrast with a no-surround control.

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Main Results:

  • Phase-dependent suppression occurred with in-phase vertical sinusoids, increasing with contrast.
  • No suppression was observed with 180-degree out-of-phase sinusoids.
  • Reduced suppression with a horizontal component in the surround, but strong suppression with plaid stimuli.

Conclusions:

  • Two distinct gain control mechanisms are implicated: one orientation-tuned and phase-dependent, the other pooling across orientations.
  • Plaid stimuli activate the orientation-pooling mechanism, while simple sinusoids reveal the orientation-tuned mechanism.