Harlow's findings with motherless monkeys showed that physical contact (or love) is:

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Harlow's findings demonstrated that physical contact (or love) is a fundamental need not only in humans, but also in other species. The motherless monkeys that were given a surrogate mother made of wire did not develop normal social and cognitive abilities, which emphasized the importance of love and physical contact for healthy development.

Harlow's Findings with Motherless Monkeys Showed That Physical Contact (Or