What is an important factor in attachment as demonstrated by Harry Harlow's experiment with monkeys?

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Harlow's experiment demonstrated that contact comfort, or the physical touch and comfort provided by a mother figure, was an important factor in attachment. The monkeys in the study preferred a mother figure that provided comfort even if it did not provide food, indicating that the need for emotional attachment and comfort is just as important as physical needs.

What Is an Important Factor in Attachment as Demonstrated by Harry