Figure 4.

Baseline heart rate co-varied with baseline pupil size. (A) Example pupil image. (B) Average baseline pupil size of trials with four behavioral outcomes. Each dot indicates a session. n = 69 sessions. (C) Task evoked pupil dilations associated with four behavioral outcomes. (D) Baseline pupil size exhibited an inverted U-shaped relationship with perceptual sensitivity. (E) Baseline pupil size exhibited a U-shaped relationship with decision criterion. (F,G) Linear and quadratic regression coefficients of perceptual sensitivity and decision criterion with regard to baseline pupil size. (H) Correlation between baseline heart rate and pupil size in an example session. n = 322 trials. (I) Correlation between baseline heart rate variability and pupil size in the example session shown in (H). Each dot indicates a trial in (H,I). n = 322 trials. (J) Pearson correlation coefficients between baseline heart rate/heart rate variability and pupil size. Error bars and shaded areas indicate SEM.