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 and Health
In 2012 Maunder and Hunter combined the internal working model with the attitudes, behaviours and emotional expression of the different styles to create a prototype based classification that included severity of insecurity. This model was designed to be clinically useful, allowing healthcare providers to identify and predict the behaviours of patients whose attachment systems were activated by pain and illness.