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Visualizing Visual Adaptation
Published on: April 24, 2017
Color perception in the intermediate periphery of the visual field
Thorsten Hansen1, Lars Pracejus, Karl R Gegenfurtner
1Department of Psychology, Justus-Liebig-University, 35394 Giessen, Germany. Thorsten.Hansen@psychol.uni-giessen.de
Journal of Vision
|September 18, 2009
Summary
Color perception declines in the peripheral retina, especially for red-green hues. This study confirms chromatic detection is possible at large eccentricities, mediated by cone-opponent mechanisms.
Area of Science:
- Vision science
- Retinal physiology
- Color perception
Background:
- Color perception is best in the fovea and declines in the periphery.
- Red-green color sensitivity decreases more rapidly than luminance or blue-yellow sensitivity toward the periphery.
- This decline is hypothesized to stem from larger receptive fields and cone cone contributions in parvocellular retinal ganglion cells.
Purpose of the Study:
- To investigate the discrepancy between psychophysical and physiological findings regarding peripheral color vision.
- To explore chromatic detection at high eccentricities (up to 50 degrees) using variable stimulus sizes.
- To determine the mechanisms underlying chromatic detection in the peripheral visual field.
Main Methods:
- Utilized psychophysical experiments with variable stimulus sizes.
- Tested chromatic detection at eccentricities up to 50 degrees.
- Compared results with existing physiological data from macaque monkeys.
Main Results:
- Chromatic detection worsens with increasing retinal eccentricity.
- Color vision is still possible at large eccentricities, contradicting some previous psychophysical findings.
- Peripheral chromatic detection is mediated by cone-opponent mechanisms.
Conclusions:
- Cone-opponent mechanisms are active in mediating color vision even at significant peripheral eccentricities.
- Reconciles conflicting psychophysical and physiological data on peripheral color vision.
- Highlights the continued role of specific cone pathways in peripheral color processing.
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