Harry Harlow

Harry Harlow was an American psychologist whose rhesus monkey studies showed that infant attachment depends on more than feeding, emphasizing comfort and physical contact.

Wire Mother Experiment: An experiment in which infant rhesus monkeys chose between a cloth-covered surrogate and a wire surrogate that provided milk. It isolated the appeal of soft contact from access to food.
Attachment Theory: A framework explaining how early bonds with caregivers shape security and later social behavior. Harlow’s findings supplied influential animal evidence that attachment is not reducible to feeding.
John Bowlby: A British psychiatrist who developed a major theory of attachment between children and caregivers. Bowlby’s account of human attachment developed alongside evidence from Harlow’s animal studies.
Maternal Bonding: The emotional relationship that develops between a mother and her infant. Harlow’s work helped shift explanations of this bond beyond nutrition and biological need.
Rhesus Macaque: A species of macaque widely used in biomedical and behavioral research. Harlow studied infant attachment by observing this species in controlled settings.
Comfort Object: An object that provides reassurance through familiarity, softness, or association with safety. The monkeys’ preference for cloth surrogates helped establish comfort as a measurable motive.
Mary Ainsworth: A developmental psychologist known for research on infant-caregiver attachment and the Strange Situation procedure. Her studies examined human attachment patterns that Harlow’s monkey work helped make scientifically salient.
Hospitalism: Developmental and emotional harm associated with prolonged institutional care and insufficient personal attention. Harlow’s findings contributed to wider concern about the effects of social and physical deprivation.
Surrogate Mother: An artificial caregiver used in studies of infant behavior and attachment. Harlow’s cloth and wire surrogates tested what infant monkeys sought from a caregiver.
Imprinting: A form of rapid learning in which young animals form lasting social preferences during a sensitive period. Harlow’s attachment findings concerned sustained contact rather than imprinting alone.

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