Suppressive Effect of Sustained Low-Contrast Adaptation followed by Transient High-Contrast on Peripheral Target Detection.

Document Type: 
Article
Article Type: 
article
Disciplines: 
Neuroscience
Topics: 
Sensory Systems
Date of Issue: 
2004
Authors: 
Farshad Moradi, Shinsuke Shimojo
Journal/Publication Title: 
Vision Research
Volume: 
44
Issue Number: 
5
Page Range: 
449-460
Official URL: 
http://dx.doi.org/10.1016/j.visres.2003.10.005
Alternative URL: 
http://www.klab.caltech.edu/~farshadm/pub/Moradi_VR03.pdf
Abstract: 
We observed that presenting a low-contrast Gabor patch (2 cpd, 5 degrees eccentricity, contrast=4%) for 8 s and then flashing a 20-30 ms high-contrast patch over it could elicit the perceptual disappearance of a subsequent low-contrast stimulus, whereas neither low-contrast adaptation nor high-contrast flash alone had any considerable effect (p<0.00001). In other experiments we found (a) suppressive components are phase-insensitive, (b) the effect transfers between eyes, (c) suppression is selective for orientation, and (d) the induction by the transient high-contrast Gabor patch could be transferred to another previously adapted location up to a few degrees. Results indicate synergy between contrast and adaptation through a non-linear interaction between rapid gain adjustment to transient change and adaptation to sustained spatial patterns. Findings are compatible with non-local mechanisms presumably at the cortical level.
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