Fig. 4
From: Mothers’ pupillary responses to infant facial expressions
Grand average pupil response. Pupil time-series were baseline-corrected to the 300-ms interval preceding the face stimulus. The pupil response is shown for mild negative (MN) and positive (MP) as well as for strong negative (SN) and positive (SP) stimulus conditions. Face onset is indicated by the vertical line and the time-windows for pupil constriction and dilation by blue and yellow background, respectively. The shaded are around curves indicate standard error of the mean