A study designed to investigate the effects of permanent maternal separation in infant rhesus monkeys, 60, 90, and 120 days of age, and housed individually or in Paris. Monkeys separated at 90 days and housed individually showed the highest levels of disturbance. (DP)

A study of the effect of the twin sibling relationship upon interactions between monkey mothers and infants. Findings provided strong support for the prediction that the twin sibling presence decreases the amount of behavior directed from infant to mother. Differences in maternal behavior were concluded to be reactions to differences in infant…

Inescapable shock given to weanling rats produced large deficits in adult escape behavior. Experience with escapable shock while a weanling immunizes the animal against the deficits produced by inescapable shock received as an adult. Implications of these findings for animal models of human depression are discussed. (Author/MS)