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.
Affect infusion model
The Affect infusion model (AIM) is a theoretical model in the field of human psychology. Developed by social psychologist Joseph Paul Forgas in the early 1990s, it attempts to explain how mood affects one's ability to process information. A key assertion of the AIM is that the effects of mood tend to be exacerbated in complex situations that demand substantial cognitive processing. In other words, as situations become more complicated and unanticipated, mood becomes more influential in driving evaluations and responses.