Figure 3.

Pupillary prediction of attentional resources and behavioral performance. (A) Procedure of Experiment 3 in which a flickering disk (2 Hz) with a superimposed letter stream circled around fixation. Observers had to detect the “x” while fixating at the center dot. The disk moved behind occluders at the vertical and horizontal meridians. The occluders had the same color as the background but are here indicated in a brighter gray for clarification. (B) Example of an observer's pupil size trace in a single trial. (C) FFT power analysis per observer (gray) and averaged across observers (black). (D) Power at 2 Hz as a function of time around hit (black) and missed targets (dashed gray). The transparent patches around the average indicate the standard error. The patch at the bottom of the plot indicates at which time points the power between hit and missed targets significantly differed (p < 0.05). (E) Average AUC as a function of time around target onset for FFT power distributions (black) and baseline raw pupil size (dashed gray). Patches at the bottom and top indicate significantly higher or lower AUC (compared to 0.5) for power values (black) or pupil baseline (gray).