What is attachment theory?

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Attachment theory, developed by British psychiatrist John Bowlby and extended empirically by Mary Ainsworth, proposes that humans have a biological drive to form close emotional bonds with caregivers, and that the quality of these early bonds creates templates that shape emotional regulation, self-concept, and relationship patterns throughout life. John Bowlby, working at the Tavistock Clinic in London in the 1950s and 1960s, broke from the prevailing psychoanalytic view that infant attachment to the mother was secondary to feeding. Drawing on ethology, evolutionary biology, and cybernetics, Bowlby proposed that attachment is a primary biological system, as fundamental as feeding and reproduction, that evolved because caregiver proximity was essential for survival. Mary Ainsworth, developmental psychologist at the University of Virginia, provided the empirical foundation for Bowlby's theory through her Strange Situation protocol: a structured laboratory observation of infants with their caregivers that identified distinct patterns of attachment behavior. Her research established the four attachment patterns that remain the foundation of the field. The central insight of attachment theory is that early relational experience becomes the template for how the nervous system processes all subsequent relational experience. The internal working model, an unconscious relational blueprint built from early attachment, shapes attention, memory, interpretation of social cues, and behavioral responses in adult relationships without the person's awareness. Contemporary attachment research by Dr. Mary Main at UC Berkeley and Dr. Daniel Siegel at UCLA has expanded the theory to include how early attachment patterns are encoded in the brain and how they can be changed through therapeutic and relational experience. Dr. Siegel's interpersonal neurobiology demonstrates that attachment is ultimately a story about how relationships shape the developing brain.