1. behavior associated implicated in the formation of significant relationships, for example, symbiosis with the mother. 2. also refers to the infant gaining proximity to or contact with his or her caregiver by responding differentially to them. Its manifestations include crying, smiling, calling, gazing, and clinging. See also attachment theory.
ATTACHMENT BEHAVIOR: “The baby who smiled at his mother to gain her attention could be said to be exhibiting attachment behavior.”