Test additivity at visual threshold as a function of exposure duration

概要

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In the present study, the detection thresholds for the test stimulus, which consisted of the colors opponent to each other, were obtained as a function of the test exposure duration. Results were analysed in terms of summation index. When the red- and green-test stimuli were mixed, the index indicated inhibition at the long test durations (longer than about 100 ms), but rather summation at the short durations. For the yellow- and blue-test stimuli, on the other hand, it seems that those stimuli were more summative than the red- and green-ones, and might need longer exposure duration to yield inhibition. These results were discussed in terms of the opponent-color system, which is antagonistic in nature and should be more sensitive to the stimuli of long durations, and the non-opponent or luminance system, which is additive in nature and should be more sensitive to the stimuli of short durations.
公益社団法人日本心理学会の論文