The most well-known experiment conducted by Harry Harlow entailed offering newborn rhesus monkeys a choice between two distinct "mothers." One had a nice terrycloth outside but no food within.
Harlow made a point of this by providing monkeys with two substitute mothers: a wire mother who gave sustenance and a fabric mother who offered physical comfort. The fabric mother was consistently favored by the monkeys.
Some young rhesus monkeys were housed in separate cages apart from their peers and nurtured in a laboratory environment after being taken from their mothers. The monkeys displayed abnormal behavior when kept apart from their social group, including blank stares, cage circling, and self-mutilation.
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