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Pupil dilation as a function of time in the vocal, simple and silent conditions. The onset of the visual stimuli is marked as 0 on the X axis. Alerting cues were presented at variable intervals during the −400 to 80 ms interval before the onset of the visual stimuli (see Method). The colored areas cover mean pupil size ± 95% confidence intervals. Pupil dilation is expressed as percentual change from individual baseline.
