Abstract

A contrast-matching technique was used to measure the apparent contrast of sinusoidal gratings, varying in contrast and spatial frequency, as a function of grating size. In the contrast range of 0.01–0.1, it was found that apparent contrast increases with increased grating width or length, showing a dependence on the number of cycles presented similar to that shown by detection threshold. On the other hand, apparent contrast is insensitive to grating size in the contrast range of 0.1–0.54. This difference between low- and high-contrast gratings suggests that two separate spatial-integration processes underlie suprathreshold-contrast processing.

© 1984 Optical Society of America

Spatial-frequency difference thresholds for central and peripheral viewing

Ellen S. Richter and Dean Yager
J. Opt. Soc. Am. A 1(11) 1136-1139 (1984)

Perceived contrast in the fovea and periphery

Mark W. Cannon
J. Opt. Soc. Am. A 2(10) 1760-1768 (1985)

Stochastic independence of color-vision mechanisms confirmed by a subthreshold summation paradigm

José Antonio Garcı́a, Juan Luis Nieves, Eva Valero, and Javier Romero
J. Opt. Soc. Am. A 17(8) 1485-1488 (2000)

Aliasing in peripheral vision for counterphase gratings

Roger S. Anderson
J. Opt. Soc. Am. A 13(11) 2288-2293 (1996)

Opponent-movement mechanisms in human vision

C. F. Stromeyer, R. E. Kronauer, J. C. Madsen, and S. A. Klein
J. Opt. Soc. Am. A 1(8) 876-884 (1984)