Who proposed the idea that attachment is based on contact comfort?

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Harry Harlow proposed the idea that attachment is based on contact comfort. In his famous experiments with infant monkeys, he found that they preferred a soft and comforting cloth mother figure over a wire mother figure that provided food. This suggested that emotional attachment was not solely based on meeting basic needs like food, but also on the sense of security and comfort provided by physical contact.

Who Proposed the Idea That Attachment Is Based on Contact