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- W2016563397 abstract "Several studies have indicated that the exponent of the function relating perceived contrast to physical contrast is influenced by spatial frequency (e.g., Franzen & Berkley, 1975). This result has been called into question by other studies that have found the exponent to be unaffected by changes in spatial frequency (e.g., Gottesman, Rubin, & Legge, 1981). Possible artifactual reasons for the spatial frequency effect include failure to take into account range and stimulus repetition effects as well as contrast threshold differences. The present study examined the influence of spatial frequency on the relationship between perceived and physical contrast and controlled for these possible artifacts. Using a modulus-free version of magnitude estimation, judgments of perceived contrast were obtained from 7 observers at each of four spatial frequencies—.75, 4, 15, and 18 cycles per degree (cpd). When the data were fit with a threshold-corrected power function, an increase in the exponent of the perceived-contrast function was still observed at both low and high spatial frequencies, relative to a middle spatial frequency." @default.
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- W2016563397 date "1985-09-01" @default.
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- W2016563397 title "Suprathreshold contrast perception as a function of spatial frequency" @default.
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- W2016563397 doi "https://doi.org/10.3758/bf03207171" @default.
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