P1-12: Different Double-Pulse Distinguishability Among the Luminance Opponency, the Red-Green Opponency, and the Blue-Yellow Opponency

P1-12: Different Double-Pulse Distinguishability Among the Luminance Opponency, the Red-Green Opponency, and the Blue-Yellow Opponency

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The inter-stimuli-interval (ISI) thresholds of double pulses discrimination were measured to investigate the temporal distinguishability of double pulses of the luminance opponency, the red-green opponency, and the blue-yellow opponency.Double pulses were presented randomly in one of four quadrants, defined by a central fixation cross on a CRT display controlled by the real time sequencer (RTS) of the VSG Latches system in 42-bit color mode calibrated with less than 3% display error rate of the 1931 CIE luminance and chromatic coordinate.Each pulse was of duration 6.

7 msec and included a Gaussian patch with gradation of tristimulus values from the peak to the background in equal-energy-white (the luminance opponency) or isoluminance (the red-green and the blue-yellow opponency) configuration.Eleven observers were asked to report the number of pulses (one or two) observed while ISI was adjusted Combat Boots by a psi method.Psychometric functions were estimated using the cumulative distribution function of the extreme value distribution.

The threshold was the ISI value corresponding with the rate of 63.21% correct answer.Significant differences were found among ISI thresholds of the luminance, blue-yellow, and red-green opponency.

Results supported that the temporal distinguishability of double pulses of the luminance opponency, the red-green opponency, and the blue-yellow opponency were significantly different.The difference can be explained by the impulse response functions (IRF) with various first peak time among the luminance opponency, the red-green opponency, and the blue-yellow opponency.