Narrow-band spatial mechanisms in apparent contrast matching

Abstract Suprathreshold contrast matching experiments produced narrow spatial frequency bandwidth estimates similar to estimates from analogous subthreshold additivity experiments. A simple grating contrast standard was fixed on one half of a split-screen CRT display at 0, 10 or 30 × threshold contrast. On the other half the subject adjusted either one or both components of two-frequency composite gratings to match the apparent contrast of the standard. Composites of 5 and 15 c/deg had the same apparent contrast as the larger component presented alone. With closer frequencies in the composite the effect persisted for both the blank and 10 × threshold standards to the same small frequency ratios found in earlier detection experiments.

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