Developmental psychology
Attachment theory, originally developed by John Bowlby, focuses on the importance of open, intimate, emotionally meaningful relationships. Attachment is described as a biological system or powerful survival impulse that evolved to ensure the survival of the infant. A child who is threatened or stressed will move toward caregivers who create a sense of physical, emotional and psychological safety for the individual. Attachment feeds on body contact and familiarity. Later Mary Ainsworth developed the Strange Situation protocol and the concept of the secure base.
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.