Abstract
Cats were trained to discriminate between two sinusoidal grating patterns differing only in contrast. The smallest discriminable contrast difference was determined for a number of different baseline contrast levels, and the resulting contrast increment thresholds plotted in the form of a contrast discrimination function. The resulting function was linear when plotted on log/log coordinates and the slope of this function varied with spatial frequency. These behavioural results are compared to the contrast/response properties of retinal and cortical neurones.
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