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Lateral sensitivity modulation explains the flanker effect in contrast discrimination.

C C Chen1, C W Tyler

  • 1Smith-Kettlewell Eye Research Institute, San Francisco, CA 94115, USA.

Proceedings. Biological Sciences
|April 12, 2001
PubMed
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Adjacent stimuli, or flankers, significantly alter contrast discrimination. Flankers reduce target detection thresholds and shift the contrast threshold versus contrast (TvC) function, suggesting a multiplicative effect not explained by prior models.

Area of Science:

  • Visual perception
  • Computational neuroscience

Background:

  • Contrast discrimination is fundamental to visual processing.
  • Understanding how surrounding stimuli influence perception is crucial for developing accurate models.

Purpose of the Study:

  • To investigate the impact of adjacent stimuli (flankers) on contrast discrimination using a dual-masking paradigm.
  • To determine the nature of the flanker effect on the target threshold versus pedestal contrast (TvC) function.

Main Methods:

  • Employed a dual-masking paradigm with a target, pedestal, and flankers.
  • Analyzed the effect of flankers on target detection thresholds across varying pedestal contrasts.
  • Extended the divisive inhibition model to incorporate flanker effects as lateral multiplicative sensitivity modulation.

Related Experiment Videos

Main Results:

  • Flankers reduced target thresholds at zero pedestal contrast.
  • Flankers caused a horizontal leftward shift in the TvC function at high pedestal contrasts.
  • Flankers reduced pedestal facilitation at low pedestal contrasts, indicating a multiplicative influence.

Conclusions:

  • The flanker effect on contrast discrimination is best described as a multiplicative factor.
  • The extended divisive inhibition model accurately accounts for the observed data, incorporating lateral multiplicative sensitivity modulation.