Comparing the spatial-frequency response of first-order and second-order lateral visual interactions: Grating induction and contrast-contrast

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The magnitudes of two suprathreshold lateral spatial-interaction effects - grating induction and contrast-contrast-were compared with regard to their dependence upon inducing-grating spatial frequency. Both effects cause the contrast of target stimuli embedded in surrounding patterns to be matched nonveridically. The magnitudes of each effect were measured in a common unit that indexed the degree of nonveridical contrast matching across a large range of target-grating contrasts (±0.80). Grating induction was a low-pass effect with respect to spatial frequency, whereas contrast-contrast was bandpass, peaking at approximately 4.0 cycles deg-1. The magnitude of grating induction exceeded that of contrast-contrast, both overall and at their optimal frequencies (0.03125 and 4.0 cycles deg-1, respectively); the two effects are equipotent at an inducing-grating spatial frequency of 1.0 cycle deg-1. A significant negative correlation between the magnitudes of the two effects suggests a link whereby activation of second-order normalization mechanisms may inhibit first-order mechanisms.

Original languageEnglish (US)
Pages (from-to)501-510
Number of pages10
Issue number4
Publication statusPublished - Jun 15 2005


ASJC Scopus subject areas

  • Experimental and Cognitive Psychology
  • Ophthalmology
  • Sensory Systems
  • Artificial Intelligence

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