Figure 6.

Group pupil dilation in the Noise condition according to different normalization methods and baseline periods. Pupil traces obtained by averaging the correctly answered trials in the Noise conditions (N = 20). Grey traces were obtained in the Noise Aided condition, red traces were obtained in the Noise Unaided condition. Traces were computed using several normalization methods (1: baseline correction only, 2: proportional change from baseline, 3: within-trial mean scaling, 4: grand mean scaling, 5: z-score transformation) and several baseline periods (dashed rectangles) (a: Start: from start (dashed black line) to the auditory cue before word presentation (blue line), b: StartCue: starting at the beginning of the auditory cue before word presentation (blue line), c: EndCue: starting at the end of the auditory cue before word representation, d: StartWord: ending at the beginning of the word (green line)). Baseline lengths were set at 1000 ms. Shaded area represent 95% confidence intervals.