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. 2022 Jun 3;8(6):e09631. doi: 10.1016/j.heliyon.2022.e09631

Figure 4.

Figure 4

Individual pupil-dilation patterns computed using different normalization methods and baseline periods. Pupil traces obtained by averaging the correctly answered trials in the Noise Unaided condition. Blue traces were obtained from a participant presenting no increase in pupil dilation before the word presentation (green line). Red traces were obtained from a participant showing a continuous increase in pupil dilation before the word presentation (green line). 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 presentation, d: StartWord: ending at the beginning of the word (green line)). Baseline lengths were set at 1000 ms. Shaded areas represent 95% confidence intervals.