The detection of gratings in narrow‐band visual noise*

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Abstract
1. The detectability of sinusoidal gratings comprised of either one or many cycles was measured in veiling luminances the spatial frequencies of which were either narrow‐ or broad‐band.2. In narrow‐band noise, the single‐cycle grating was detected with approximately 0·6 log units less contrast than the many‐cycle grating. On the other hand when both broad‐band and narrow‐band noise were present, there was no measurable difference in the detectability of the two types of grating.3. The results are interpreted as supporting the hypothesis of Campbell & Robson (1968) that spatially varying luminance patterns are processed by mechanisms selectively sensitive to limited ranges of spatial frequencies.

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