Abstract

We investigated whether the temporal properties of responses to chromatic change stimuli were different between chromatic channels. We employed the isoluminant double-pulse method to catch responses to a transient chromatic change stimulus. In this method chromatic pulses were presented successively with a stimulus onset asynchrony. The temporal properties were obtained as functions of stimulus onset asynchrony. With the use of this method, it is possible to extract responses from chromatic channels without activating the luminance channel because, even though the chromaticity was varied, the luminance of the chromatic pulses was kept equivalent to that of the white light used as a reference. For the purpose of selectively stimulating each chromatic channel, we used chromatic pulses of which the color was varied along the tritanopic confusion line or the R/G cardinal axis through the reference white on the $x–y$ chromaticity diagram. We showed that there was no difference in the temporal property between chromatic channels by comparing functions representing different degrees of temporal integration of chromatic responses to double pulses. We also found that the functions exhibited a secondary peak, such that the chromatic response could not be represented as a simple low-pass filter function.

© 1997 Optical Society of America

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