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Red/Green Color Discrimination and Stimulus Size
Author(s) -
Nagy Allen L.
Publication year - 1994
Publication title -
color research and application
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.393
H-Index - 62
eISSN - 1520-6378
pISSN - 0361-2317
DOI - 10.1111/j.1520-6378.1994.tb00069.x
Subject(s) - luminance , stimulus (psychology) , wavelength , optics , mathematics , color vision , psychophysics , physics , psychology , cognitive psychology , neuroscience , perception
The model of Boynton and Kambe was used to analyze wavelength discriminationfunctions measured in the fovea by McCree. The long‐wavelength portions of these functions. which were measured with several field sizes at three different luminance levels. are described well by the model. Thresholds decrease with increasing field size. but the relationship between threshold and field size is dependent on the color of the test stimulus. Two factors. summation and opponent‐mechanism adaptation. appear to affect the relationship. These two factors can be described with variations in the two coefficients of the Boynton and Kambe equation for red‐green discriminations.