What pattern the eye sees best

Uri Polat, Christopher W. Tyler

Research output: Contribution to journalArticlepeer-review

72 Scopus citations

Abstract

The visibility of gratings improves with increasing stimulus area. This effect is usually interpreted as being due to physiological summation within the extent of the largest spatial filter and due to probability summation between the outputs of linear, independent filters beyond that range. It is generally assumed that this improvement is isotropic to the patch configuration. In contrast, the existence of long-range facilitation that is configuration-specific suggests that the visibility of a local contrast is dependent on the spatial configuration of the stimuli. We measured contrast thresholds for circular and elongated Gabor patches with a static carrier. The patch envelope orientation was either the same as the bar orientation (collinear) or orthogonal to it. Contrast sensitivity was highest for elongated configurations that were collinear with the grating bars, and reached maximal efficiency at a length of about four grating cycles (eight bar widths), but a width of only one cycle.

Original languageEnglish
Pages (from-to)887-895
Number of pages9
JournalVision Research
Volume39
Issue number5
DOIs
StatePublished - 14 Mar 1999
Externally publishedYes

Bibliographical note

Funding Information:
The authors are grateful to Dov Sagi and Yoram Bonneh for providing us with equipment and technical support for part of these experiments and to the two reviewers for their helpful comments on the earlier version of this manuscript. This research was supported by The National Institute for Psychobiology in Israel, Charles Smith Foundation and NEI Grant # 7890.

Funding

The authors are grateful to Dov Sagi and Yoram Bonneh for providing us with equipment and technical support for part of these experiments and to the two reviewers for their helpful comments on the earlier version of this manuscript. This research was supported by The National Institute for Psychobiology in Israel, Charles Smith Foundation and NEI Grant # 7890.

FundersFunder number
Charles Smith Foundation
National Institute for Psychobiology in Israel
National Eye Institute7890

    Keywords

    • Contrast
    • Facilitation
    • Long-range interactions
    • Probability summation
    • Spatial summation
    • Threshold

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