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- W2276967894 abstract "We measured speed discrimination for isoluminant red - green and luminance-defined moving stimuli. The horizontal profile of the stimuli was a Gabor function with a carrier frequency of 2 cycles deg −1 . The standard stimulus was a luminance stimulus with a fixed speed of 2 deg s −1 and a fixed contrast of 0.1. The comparison stimuli were either luminance stimuli (cone contrasts: 0.05, 0.1, 0.2, 0.4) or chromatic stimuli (cone contrasts: 0.025, 0.05, 0.1). The speed of the comparison stimuli was varied by an adaptive procedure. After each trial the observer indicated which of the 2 intervals contained the slower moving stimulus. The stimuli always moved horizontally and the direction was chosen randomly at each trial. The main findings were: (i) For luminance stimuli, the perceived speed was independent of contrast (ranging from 0.1 to 0.4). For colour stimuli, the perceived speed increased with contrast for two out of four observers. (ii) The sensitivity for speed discrimination was independent of contrast for luminance and for colour stimuli. (iii) There was no consistent difference in speed discrimination sensitivity between colour and luminance stimuli when the stimuli were equated in cone contrast." @default.
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- W2276967894 date "1997-08-01" @default.
- W2276967894 modified "2023-09-27" @default.
- W2276967894 title "Speed Discrimination in Luminance and Colour Stimuli as a Function of Contrast" @default.
- W2276967894 doi "https://doi.org/10.1068/v970343" @default.
- W2276967894 hasPublicationYear "1997" @default.
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