Figure 5.

Sequence regularity was not associated with differences in incidence of dilatory pupil events. Experiment 1 (A) and experiment 2 (B). Solid lines show pupil dilation event rate. Events were defined as the onset of each pupil dilation with a duration of at least 300 ms. These were collapsed across alphabet sizes for REG (blue) and RAND (red). Gray markers at the bottom of the graph indicate time intervals where bootstrap statistics showed a significant difference between the two conditions. Dotted lines show the pupil diameter REG (blue) and RAND (red) collapsed across alphabet size. Shading indicates ± 1 SEM. The black bar indicates intervals where bootstrap statistics showed a significant difference between the two conditions. Only the pupil diameter data showed a sustained difference between REG and RAND conditions.