What was the important conclusion from Harlow's work with monkeys and attachment?

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Harlow's work with monkeys demonstrated that contact comfort is more important than association with food for developing attachment. This was shown through the monkeys preferring the soft, comforting cloth mother over the wire mother with a bottle of milk. This conclusion has been supported by subsequent research on human attachment as well.

What Was the Important Conclusion from Harlow's Work with Monkeys