Research article summary:

Short- and long-range effects in line contrast integration.

Abstract Extract:
Brincat and Westheimer [Journal of Neurophysiology 83 (2000) 1900] have reported facilitating interactions in the discrimination of spatially separated target orientations and co-linear inducing orientations by human observers. With smaller gaps between ... (Full abstract text below)

Published 2002Oct in Journal: Vision Res (Language : eng)

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1. Vision Res. 2002 Oct;42(22):2493-8

Short- and long-range effects in line contrast integration.

Tzvetanov T, Dresp B

CNRS UMR 7507, Ecole Nationale Supérieure de Physique, Université Louis Pasteur Strasbourg, Avenue Sébastien Brant, 67400 Illkirch, Strasbourg, France.

Brincat and Westheimer [Journal of Neurophysiology 83 (2000) 1900] have reported facilitating interactions in the discrimination of spatially separated target orientations and co-linear inducing orientations by human observers. With smaller gaps between stimuli (short-range effects), facilitating interactions were found to depend on the contrast polarity of the stimuli. With larger gaps (long-range effects), only co-linearity of the stimuli seemed necessary to produce facilitation. In our study, the dependency of facilitating interactions on the intensity (luminance) of line stimuli is investigated by measuring detection thresholds for a target line separated from the end of an inducing line by co-axial gaps ranging from 5 to 200 min of visual arc. We find facilitating interactions between target and inducing orientations, producing short-range and long-range effects similar to those reported by Brincat and Westheimer. In addition, detection thresholds as a function of the co-axial separation between target and inducing line reveal an interaction between the spatial regime of facilitating effects and the luminance of the stimuli. Short-range effects are found to be sensitive to changes in local intensity while long-range effects remain unaffected.

PMID : 12445843 [PubMed - Indexed for MEDLINE]

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Full Author Information

First Name	LastName	Initials
Tzvetomir	Tzvetanov	T
Birgitta	Dresp	B

Affiliation: CNRS UMR 7507, Ecole Nationale Supérieure de Physique, Université Louis Pasteur Strasbourg, Avenue Sébastien Brant, 67400 Illkirch, Strasbourg, France.

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Category links from this article:

Contrast Sensitivity - physiology
Discrimination (Psychology)
Humans
Lighting
Photic Stimulation
Sensory Thresholds - physiology
Space Perception - physiology

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