The attachment control system and computational modeling: Origins and prospects.

From his first attempts to explain attachment phenomena in the 1940s through his trilogy (Bowlby, 1969/1982, 1973, 1980), John Bowlby reformulated the theoretical underpinnings of attachment theory several times. He initially attempted to explain attachment phenomena in psychoanalytic terms. Then he invoked ethological theory in the explanation of how and why people behave as they do in close personal relationships.