Rhesus infants raised from birth with their mothers, age-mates, or cloth surrogates for periods varying from 1 to 10 months were separated from these objects and placed with dogs. Contrary to previous suggestions that were consistent with the notions of a critical period for attachment formation and irreversibility of filial bonds, the monkeys formed strong and specific attachments to their canine surrogates.
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Mason et al. (1974) studied this question.