Attachment

Attachment theory, developed by John Bowlby from the 1950s onward, describes the deep emotional bond that forms between an infant and their primary caregiver. Bowlby integrated ideas from ethology, psychoanalysis, and systems theory to propose that the need for attachment is a primary human motivation, as fundamental as hunger or thirst.

Mary Ainsworth provided the empirical foundation with her "Strange Situation" paradigm (1969), a laboratory procedure that classifies an infant's attachment style by observing their reaction to separation from and reunion with the caregiver. She identified three main styles: secure, insecure-avoidant, and insecure-ambivalent. Later, Mary Main added a fourth style: disorganized.

Secure attachment develops when the caregiver responds consistently and sensitively to the infant's needs. The child learns to explore the world with confidence because they have a "secure base" to return to. Insecure-avoidant attachment forms when the caregiver is emotionally distant or rejecting of attachment needs; the child learns to suppress their emotional needs.

Insecure-ambivalent attachment arises with inconsistent caregivers — sometimes sensitive, sometimes indifferent. The child develops hypervigilance and anxiety. Disorganized attachment, associated with maltreatment or severe neglect, is characterized by the infant's inability to develop a coherent strategy: the caregiver is simultaneously a source of safety and a source of fear.

Longitudinal research has shown that attachment styles tend to be stable across the lifespan, though they are not immutable. Insecure attachment in childhood predicts difficulties in adult relationships, but corrective experiences — including psychotherapy — can modify internal working models.

Adult attachment has been extensively studied by Cindy Hazan and Phillip Shaver (1987), who adapted Ainsworth's typology to romantic relationships. People with secure attachment tend to have more stable, satisfying relationships; those with avoidant attachment maintain emotional distance; those with anxious-ambivalent attachment experience relationships with intensity and fear of abandonment.