Stimulus-based cues weakly modulated pupil-linked arousal.

A Pupil diameter on correct trials, aligned to choice and plotted as a function of the congruence of the choice and the most-recently heard pre-test tones, separated by SNR. We only used pre-test sequences ending in two of the same tone (i.e., LL, HH) and at the lowest or highest unsigned test-tone SNR for this analysis. Lines and error bars are means and SEM across all trials and subjects. B Regression coefficients (beta values) from a linear mixed-effects model for different pupil contrasts. Error bars are 95% confidence intervals of the parameter estimates. Values were computed in 20 ms-wide time bins. Dark green lines indicate time bins for which puncorrected < 0.05.