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Gaze-following emergence in infancy and sex differences at maturity (study 1). (a) The propensity to follow gaze initially emerged in the first year of life. The duration of upwards gazing by the 47 infants on their first trial, plotted by age in months. (b) In adulthood, females began to follow gaze more robustly than males. Mean gaze-following responses by sex across cohorts (averaging all completed trials). Error bars indicate s.e.
