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The contribution of color to motion in normal and color-deficient observers.

Used opposing drifting luminance and color gratings to measure the equivalent luminance contrast of color in 4 experiments with normal and color-deficient observers. The equivalent contrast was highest for low spatial and temporal frequencies and was higher for red/green than for blue/yellow stimuli. Contrast thesholds for the discrimination of the direction of motion show that the contribution of color to motion was about the same as that for luminance in terms of multiples of threshold contrast. The perception of the motion of equiluminous stimuli to an opponent-color input is attributed to directionally selective cortical units. Chromatic stimuli had little or no equivalent contrast for color-deficient observers whether the stimulus was red/green, which they discriminated less well than normals, or blue/yellow, which they discriminated almost as well as normals. (PsycINFO Database Record (c) 2007 APA, all rights reserved)



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