Looking behavior in monkeys raised with mobile and stationary artificial mothers

Rhesus monkeys raised with mechanically driven mobile artificial mothers for the first 10 months of life looked more at other animals and were more sensitive to stimulus differences than monkeys raised on stationary surrogates. Both groups looked less and were not as discriminating as wild-born monkeys. The results are consistent with other evidence suggesting that one of the long-range consequences of maternal mobility is to reduce emotional responsiveness to novel situations.