Temporal Integration for Wavelength Change of an Equal-luminance Single Pulse

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Temporal integration of a single pulse was studied using a chromatic detection paradigm. In test and reference stimulus fields (45' diameter, 30' horizontal separation), monochromatic lights of the same wavelength were steadily presented at 100 Td. For a duration D, an isoluminant wavelength pulse was substituted in place of the test stimulus. The wavelength difference threshold Δλ, delimiting the detection of chromatic change between the test and reference stimuli, was measured as a function of D. Four wavelengths, 460,530,570,and 610 nm, were used for reference stimuli, and D was varied from 5 to 2000 ms. It was found that the Δλ-vs-D functions of 460 and 530 nm differed in shape from those of 570 and 610 nm, indicating slower chromatic responses for shorter reference wavelengths. Chromatic impulse response functions (IRFs), derived in the present study, were compared with those obtained by the double-pulse method previously reported. A possible reason for discrepancy in temporal integration properties among different chromatic responses obtained in several investigations is discussed.