Depression in Infant Monkeys Separated from Their Mothers

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Science  24 Feb 1967:
Vol. 155, Issue 3765, pp. 1030-1031
DOI: 10.1126/science.155.3765.1030


The mothers of four pigtail (Macaca nemestrina) infants living in a group were removed for 4 weeks. All infants reacted initially with agitation. Three of the four infants then became severely depressed. The depression lasted about a week and was strikingly similar to the "anaclitic depression" of human infants who lost their mothers. When they were reunited, all four dyads showed a marked and prolonged intensification of the mother-infant relationship.