Figure 2

Temporal dynamics of pupillary changes. (a) Aggregated trial-locked pupil change in mm during retrieval of the fourth and final word list for PI and RPI conditions. The shaded grey area to the left in the figure represents the initiation phase (2 seconds), i.e. before participants were allowed to respond. Shaded areas for both PI and RPI conditions denote SEM. Black lines in the lower half of the figure denote significant time points (P < 0.05) by permutation tests, corrected for multiple comparisons. (b) Principal component analysis (PCA) on the pupil data. Displayed are standardized component loadings for 3 components accounting for 81.3% of the variance: Pre-response Component (11.0%), Early Component (41.2%) and Late Component (29.1%). (c) Component scores (arbitrary units) for the three components. Error bars denote SEM.