Social and Behavioral Sciences Commons^™

Pupil Size Is Modulated By The Size Of Equal-Luminance Gratings, Jie Gao, Athena Ko, Yoshiko Yabe, Melvyn A. Goodale, Juan Chen

Brain and Mind Institute Researchers' Publications

© 2020 The Authors. Pupil size changes with light. For this reason, researchers studying the effect of attention, contextual processing, and arousal on the pupillary response have matched the mean luminance of their stimuli across conditions to eliminate the contribution of differences in light levels. Here, we argue that the match of mean luminance is not enough. In Experiment 1, we presented a circular sinewave grating on a gray background for 2 seconds. The area of the grating could be 3°, 6°, or 9°. The mean luminance of each grating was equal to the luminance of the gray background, such …