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Time course of rod influences on hue perception

Published online by Cambridge University Press:  03 July 2008

STEVEN L. BUCK ,
LAURA P. THOMAS ,
CASSANDRA R. CONNOR ,
KATELYN B. GREEN  and
TZIRE QUINTANA
STEVEN L. BUCK*
Affiliation:
Department of Psychology, University of Washington, Seattle, Washington
LAURA P. THOMAS
Affiliation:
Department of Psychology, University of Washington, Seattle, Washington
CASSANDRA R. CONNOR
Affiliation:
Department of Psychology, University of Washington, Seattle, Washington
KATELYN B. GREEN
Affiliation:
Department of Psychology, University of Washington, Seattle, Washington
TZIRE QUINTANA
Affiliation:
Department of Psychology, University of Washington, Seattle, Washington
*
Address correspondence and reprint requests to: Steven L. Buck, Department of Psychology, Box 351525, University of Washington, Seattle, WA 98195-1525. E-mail: [email protected]
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Abstract

Stimulation of dark-adapted rods can shift the hues associated with specific wavelengths throughout the spectrum: Rods exert a green bias (strengthen green relative to red) at longer wavelengths and a blue bias (strengthen blue relative to yellow) at short-to-middle wavelengths. A third rod influence at shorter wavelengths is more complicated because it has been shown to reverse direction with change of stimulus duration. Thus, for 30-ms stimuli, rods exert a green bias like that observed at longer wavelengths. However, for 1-s stimuli, rods exert a red bias that is observed nowhere else in the spectrum. We examined the latency (time course) of rod hue biases by measuring the shifts of the three spectral unique hues under dark-adapted versus bleached (cone plateau) conditions. The rod green bias at unique yellow (mean 10 nm) and, in contrast to some prior studies, the rod blue bias at unique green (mean 21 nm) were not systematically affected by test stimulus duration. A quick rod green bias (mean 5 nm) was shown at unique blue for two of three observers but was dominated by a slower rod red bias (mean 11 nm) after 30–50 ms of rod stimulation. These opposing rod influences may reflect competing effects of rod signals on ML-cone and S-cone pathways.

Keywords

Human color visionRod-cone interactionRod hue biasesHue perception
Type
Brief Communication
Information
Visual Neuroscience , Volume 25 , Issue 3 , May 2008 , pp. 517 - 520
Copyright
Copyright © Cambridge University Press 2008

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References

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