Attachment and Health
John Bowlby and Mary Ainsworth developed attachment theory in the 1960s while investigating the effects of maternal separation on infant development. The development of the Strange Situation task in 1965 by Ainsworth and Wittig allowed researchers to systematically investigate the attachment system operating between children and their parents. The Strange Situation involves separating infant-parent dyads and observing infant behaviours upon reunion. Infant behaviour tended to follow patterns, leading to the development of three attachment categories: Secure, Anxious-Avoidant, and Anxious-Resistant. In 1990, Ainsworth added a new category, championed by Mary Main, called Disorganized/Disoriented attachment, characterized by its less reliable pattern of behaviour.
Attachment theory and psychology of religion
Attachment theory began with evolutionary psychologist John Bowlby in 1969. Attachment theory was initially grounded in the observation that human beings appear to be born with an innate psychobiological system (the "attachment behavioral system") that motivates them to seek proximity to significant others ("attachment figures"). This revolutionary theory has found application in topics such as friendships, romantic relationships, coping with stress, loneliness and grief.