Contrast discrimination in the cat.
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.
D000818:Animals; D002415:Cats; D004056:Differential Threshold; D004192:Discrimination, Psychological / Q000502:physiology*; D005260:Female; D011601:Psychophysics; D012160:Retina / Q000502:physiology; D014793:Visual Cortex / Q000502:physiology; D014796:Visual Perception / Q000502:physiology*