Foveal and extra-foveal influences on rod hue biases

Green, blue and short-wavelength-red rod hue biases are strongest and most reliable with large, dimly-mesopic, extra-foveal stimuli but tend to diminish when stimuli are confined to a small area of the central fovea. This study explores how the stimulation of foveal and extra-foveal areas interact i...

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Bibliographic Details
Published in:Visual neuroscience 2006-05, Vol.23 (3-4), p.539-542
Main Authors: THOMAS, LAURA P., BUCK, STEVEN L.
Format: Article
Language:English
Subjects:
Bias
Color
Color Perception - physiology
Female
Fovea Centralis - physiology
Fovea/extra-fovea interaction
Human color vision
Humans
Influence
Male
Photic Stimulation - methods
Retinal Rod Photoreceptor Cells - physiology
ROD-CONE INTERACTION
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Summary:Green, blue and short-wavelength-red rod hue biases are strongest and most reliable with large, dimly-mesopic, extra-foveal stimuli but tend to diminish when stimuli are confined to a small area of the central fovea. This study explores how the stimulation of foveal and extra-foveal areas interact in determining rod hue biases, and whether large stimuli are as effective for revealing rod hue biases when foveally centered as when eccentrically centered. We assessed rod influence by measuring wavelengths of unique green and unique yellow (with 1-s duration, 1 log scot td stimuli and a staircase procedure) under bleached and dark-adapted conditions. We measured unique hues with foveally centered 2°- and 7.4°-diameter disks, a 7.4° (outer) × 2° (inner) diameter annulus, and a 7°-eccentric, 7.4°-diameter disk. The rod green bias (shift of unique yellow locus) was typically
ISSN:0952-5238
1469-8714
DOI:10.1017/S0952523806233509