Figure 7.

Effects of pupil entrainment to higher-order environmental structure on visual sensitivity. A, Subjects (n = 10) had to detect a small, foveally presented disk that could appear either within or between pairs in the structured condition, or at temporally matched time points in the random condition (in the absence of statistical structure and 1 Hz pupil entrainment). The luminance contrast level required to detect the disk was used as a measure of visual sensitivity. B, Luminance contrast required to detect the discs was significantly higher between pairs than within pairs, particularly in the structured condition (condition × time point interaction: F_(1,9) = 6.943, p = 0.027, η² = 0.435). There was no significant difference in luminance contrast between the random and the structured conditions between pairs (t₍₉₎ = 1.298, p = 0.226, g = 0.306), but only within pairs (t₍₉₎ = 3.818, p = 0.004, g = 0.654), reflecting wider pupil diameter as a result of 1 Hz entrainment in the structured condition. Horizontal bars indicate the mean, boxes indicate the 95% Bayes-bootstrapped high-density interval, and circles indicate the individual subjects' data points (n = 10).