The nature of love
Harlow, American Psychologist 13(12), 1958, 673-685. Eight newborn rhesus monkeys with a cloth surrogate and a wire surrogate; four fed from each, then roles swapped. Infants spent far more time on the cloth surrogate whichever supplied milk, and went to it when a frightening toy appeared. Harlow concludes contact comfort outweighs nursing as a source of affection and suggests nursing matters mainly because it brings frequent close contact.
Harlow, American Psychologist 13(12), 1958, 673-685. Eight newborn rhesus monkeys with a cloth surrogate and a wire surrogate; four fed from each, then roles swapped. Infants spent far more time on the cloth surrogate whichever supplied milk, and went to it when a frightening toy appeared. Harlow concludes contact comfort outweighs nursing as a source of affection and suggests nursing matters mainly because it brings frequent close contact.
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Harlow, H. F. (1958). The nature of love. American Psychologist, 13(12), 673-685. doi:10.1037/h0047884 https://doi.org/10.1037/h0047884