Burton M, McKeefry D, 2006, "Grating speed perception can be biased when associated with chromatic modifiers separated in time or space" Perception 35 ECVP Abstract Supplement
Grating speed perception can be biased when associated with chromatic modifiers separated in time or space
M Burton, D McKeefry
Moving luminance 'modifier' grating stimuli presented in close proximity to a test stimulus, can bias its perceived speed (Smith and Derrington, 1996 Vision Research 36 3759 - 3766). We wished to examine the influence of modifier chromaticity on this effect, and measured the perceived speed of a test grating in the presence of chromatic and luminance modifier stimuli which moved at different speeds. In initial experiments, the modifier stimuli were temporally coincident with and directly abutted the test stimulus. Under these conditions the modifiers could bias perceived speed regardless of whether they were defined by colour or luminance. In subsequent experiments we examined the effects of increasing the spatial and temporal separation between the modifiers and the test stimuli. Modifiers were able to influence the perceived speed of the test across separations of up to 3 s. There was a linear decrease in the magnitude of the speed bias with increasing spatial separation which fell to zero for separations above 12 deg. These results indicate that speed perception appears to be based upon a mechanism which pools motion energy over a relatively wide spatiotemporal window and is insensitive to the chromatic or luminance composition of the input signals.
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