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Vision Research
Article
License: Elsevier Non-Commercial
Data sources: UnpayWall
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Vision Research
Article . 2004
License: Elsevier Non-Commercial
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Vision Research
Article . 2004 . Peer-reviewed
License: Elsevier Non-Commercial
Data sources: Crossref
Vision Research
Article . 2005
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Facilitation of contrast detection in near-peripheral vision

Authors: Robert G. Giorgi; Grace P. Soong; Eli Peli; Russell L. Woods;

Facilitation of contrast detection in near-peripheral vision

Abstract

Foveal detection of a Gabor patch (target) is facilitated by collinear, displaced high-contrast flankers. Polat and Sagi reported that the same phenomenon occurred in the periphery, but no data were presented [Proc. Natl. Acad. Sci. 91 (1994) 1206]. Others have found no facilitation in a limited number of conditions tested. To resolve this apparent conflict, we measured lateral facilitation in the near-periphery using a range of stimulus parameters. We found facilitation for a range of target-flanker distances for peripheral eccentricities up to 6 degrees , but the magnitude of the effect was less than found in central vision. Facilitation varied across subjects and with spatial frequency. Flanker contrast had no effect over the range evaluated (10-80%). Equal facilitation was found for two global arrangements of the stimulus pattern. Facilitation was found using a temporal, but not a spatial two-alternative forced-choice paradigm, accounting for the different results among previous studies. This finding supports previous indications of the role of attention in altering such facilitation. The value of facilitation from lateral interactions for persons with central vision impairment, who have to shift their attention to a peripheral locus constantly, needs to be examined.

Related Organizations
Keywords

Adult, Male, Adolescent, Sensory Systems, Contrast Sensitivity, Ophthalmology, Pattern Recognition, Visual, Orientation, Sensory Thresholds, Psychophysics, Humans, Attention, Female, Visual Fields, Photic Stimulation

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    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 10%
    influence
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
32
Top 10%
Top 10%
Top 10%
hybrid