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Box plots of amygdala volumes dichotomized between infants who showed no fear reaction (composite score of corresponding variable = 0), and infants who showed any fear reaction (composite score of corresponding variable > 0) to the fearsome mechanical dog episode. Reaction/no reaction infants groups were created based on the following composite scores: (A) escape response; (B) bodily fear; (C) facial fear; (D) distress vocalizations; (E) positive motor activity.
