Abstract

In the region of the CFF the visual response does not obey Weber’s law but behaves linearly in the sense that it is independent of the background adapting luminance.¹ This allows measurement of the linear component of the visual response excluding nonlinear adaptation and lateral inhibitory effects. We measured this linear visual response in conditions where thresholds were determined by red-sensitive (R) or green-sensitive (G) cones alone, by using either 660- or 555-nm narrowband stimuli. The stimulus field was 5.7° in diameter at 35° eccentricity in the temporal field and had a perceptually equiluminant white surround.

© 1986 Optical Society of America