Harry Harlow studied the early development of infant monkeys who were placed in cages with two surrogate mothers, one made of metal that was a milk source and one that had no milk but was made of soft terrycloth. Harlow found that that these infant monkeys developed attachments with:

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The results of Harlow's study were that the infant monkeys showed a distinct preference for the surrogate made of terrycloth. They spent more time clinging and vocalizing to it, and they ran to it when they were frightened. Apparently, attachment requires more from the mother than mere physical presence or the provision of food.

Harry Harlow Studied the Early Development of Infant Monkeys Who