Eight newborn rhesus monkeys were separated from their biological mothers shortly after birth, Each infant was placed in a cage with two inanimate wire "surrogate mothers": one bare, one covered in cloth, Four monkeys had feeding bottle on wire mother, four had feeding bottle on cloth mother, Monkeys' behavior observed, specifically how much time they spent with each surrogate mother, Monkeys also observed when shown scary stimulus (e.g. metal robot), Monkeys overwhelmingly preferred and spent more time with the soft, cloth mother, Concluded that contact more important for attachment than feeding.

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