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    This article has been cited by the following publications. This list is generated based on data provided by CrossRef.

    Cao, Dingcai and Lu, Yolanda H. 2012. Chromatic discrimination: differential contributions from two adapting fields. Journal of the Optical Society of America A, Vol. 29, Issue. 2, p. A1.


The gap effect is exaggerated in parafovea

  • DOI:
  • Published online: 01 September 2006

In central vision, the discrimination of colors lying on a tritan line is improved if a small gap is introduced between the two stimulus fields. Boynton et al. (1977) called this a “positive gap effect.” They found that the effect was weak or absent for discriminations based on the ratio of the signals of long-wave and middle-wave cones; and even for tritan stimuli, the gap effect was weakened when forced choice or brief durations were used. We here describe measurements of the gap effect in the parafovea. The stimuli were 1 deg of visual angle in width and were centered on an imaginary circle of radius 5 deg. They were brief (100 ms), and thresholds were measured with a spatial two-alternative forced choice. Under these conditions we find a clear gap effect, which is of similar magnitude for both the cardinal chromatic axes. It may be a chromatic analog of the crowding effect observed for parafoveal perception of form.

Corresponding author
Address correspondence and reprint requests to: Marina Danilova, Pavlov Institute of Physiology, Nab. Makarova 6, St. Petersburg 199034, Russia. E-mail:
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Visual Neuroscience
  • ISSN: 0952-5238
  • EISSN: 1469-8714
  • URL: /core/journals/visual-neuroscience
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