Masking effects of low-frequency sinusoidal gratings on the detection of contrast modulation in high-frequency carriers.
A modification and extension of Kortum and Geisler's model [Vision Res. 35, 1595 (1995)] of early visual non-linearities that incorporates an expansive nonlinearity (consistent with neurophysiological findings [Vision Res. 35, 2725 (1995)], a normalization based on a local average retinal illumination, similar to Mach's proposal [F. Ratliff, Mach Bands: Quantitative Studies on Neural Networks in the Retina (Holden-Day, San Francisco, Calif, 1965)], and a subsequent compression suggested by Henning et al. [J. Opt. Soc. Am A 17, 1147 (2000)] captures a range of hitherto unexplained interactions between a sinusoidal grating of low spatial frequency and a contrast-modulated grating 2 octaves higher in spatial frequency.
Henning
G Bruce
GB
The Sensory Research Unit, Department of Experimental Psychology, South Parks Road, Oxford, OX1 3UD, UK.
D015350:Contrast Sensitivity; D004192:Discrimination, Psychological; D006801:Humans; D008960:Models, Psychological; D010470:Perceptual Masking; D010775:Photic Stimulation / Q000379:methods*