Harlow's contact comfort studies

Harry Harlow raised infant rhesus monkeys with two fake mothers — one made of bare wire that dispensed milk, and one covered in soft terry cloth that gave no food — and answered a question that had been assumed for decades: do babies love their caregivers because they get fed, or because of something else?

The answer stunned the field. The baby monkeys spent almost all their time clinging to the soft cloth mother and went to the wire mother only briefly to feed, then rushed back to the cloth. When a frightening object (a mechanical drumming bear) was introduced, the terrified infants ran to the cloth mother for comfort and a secure base, not to the feeding wire mother. This demonstrated contact comfort — the innate need for soft, physical touch — as a powerful basis of the attachment bond.

Harlow's findings directly contradicted the dominant behaviorist / drive-reduction ("cupboard love") view that attachment forms simply because the caregiver reduces the hunger drive. Comfort of touch, not feeding, drove the bond. His work gave crucial experimental support to Bowlby's attachment theory.

Harlow also showed the cost of its absence. Monkeys raised in social isolation became severely disturbed — fearful, socially incompetent, unable to mate or parent normally — evidence for the damage of early maternal/social deprivation. Well-adjusted rearing also required the cloth mother to serve as a secure base from which the infant would explore a novel environment.

Clinical Pearl: Harlow's monkeys chose the cloth (comfort) mother over the wire (feeding) mother — the one-line takeaway examiners want is that contact comfort, not feeding, is the foundation of attachment, disproving drive-reduction/"cupboard love" and supporting Bowlby.