Internal working model of attachment
Internal working model of attachment is a psychological approach that attempts to describe the development of mental representations, specifically the worthiness of the self and expectations of others' reactions to the self. This model is a result of interactions with primary caregivers which become internalized, and is therefore an automatic process. John Bowlby implemented this model in his attachment theory in order to explain how infants act in accordance with these mental representations. It is an important aspect of general attachment theory.
Attachment therapy
Speltz cites child psychiatrist Martha Welch and her 1988 book, "Holding Time", as the next significant development. Like Zaslow and Tinbergen, Welch recommended holding therapy as a treatment for autism. Like Tinbergen, Welch believed autism was caused by the failure of the attachment relationship between mother and child. Mothers were instructed to hold their defiant child, provoking anger and rage, until such time as the child ceased to resist, at which point a bonding process was believed to begin.