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Instead, the affectional ties to the mother show a lifelong, unrelenting persistence and, even more surprising, widely expanding generality.
Many of these difficulties can be resolved by the use of the neonatal and infant macaque monkey as the subject for the analysis of basic affectional variables.It is possible to make precise measurements in this primate beginning at two to ten days of age, depending upon the maturational status of the individual animal at birth.The macaque infant differs from the human infant in that the monkey is more mature at birth and grows more rapidly; but the basic responses relating to affection, including nursing, contact, clinging, and even visual and auditory exploration, exhibit no fundamental differences in the two species.We had separated more than 60 of these animals from their mothers 6 to 12 hours after birth and suckled them on tiny bottles.
The infant mortality was only a small fraction of what would have obtained had we let the monkey mothers raise their infants.Even the development of perception, fear, frustration, and learning capability follows very similar sequences in rhesus monkeys and human children.
