the theory. While serving as an assistant professor of psychology at Indiana University School of Medicine from 1957 to 1962, Charles Ferster employed errorless learning to instruct young autistic children how to speak. This was an early example of what would later be known as applied behaviour analysis. The 1960s In 1964, American psychologist Bernard Rimland published the book Infantile Autism: The Syndrome and Its Implications for a Neural Theory of Behavior, which refuted the refrigerator theory. Instead, Rimland suggested, autism was a result of biochemical defects "triggered by environmental assaults". It included a forward by Leo Kanner. The book challenged the medical establishment's perceptions of autism. Rimland's message resonated with parents, who wanted to share their stories with him and ask for advice. From the late 1950s, Charles Ferster and others used the new science of behaviorism to teach people with autism and other mental conditions. This led researchers at the University of Kansas to start the Journal of Applied Behavior Analysis in 1968, establishing the concept of applied behavior analysis (ABA). ABA soon came to be used extensively with autistic children in the United States. Two major American professional associations would later be founded for ABA practitioners, with the credentialing "Behavior Analysis Accrediting Board" founded in 1998. 1970 also saw the release of the English translation of Gerhard Bosch's 1962 book as Infantile autism: a clinical and phenomenological-anthropological investigation taking language as the guide. It was translated by Derek and Inge Jordan, and included an introduction from Bruno Bettelheim. It used the term "Asperger's syndrome" to describe the symptoms of Asperger's patients. British researcher Lorna Wing of the Institute of Psychiatry, London used the term "Asperger's syndrome" in 1976, identifying that there were many people with autistic traits who had good language skills. Considering the wide difference of autistic traits in different people, Wing and Judith Gould coined the term "autism spectrum" in their 1979 paper Severe impairments of social interaction and associated abnormalities in children: Epidemiology and classification. DSM-III and pervasive developmental disorder (1980–1987) The DSM-III (1980) redefined the childhood type of schizophrenia as three kinds of "pervasive developmental disorder" (PDD). "Infantile autism" began before a child was 30 months old, and "childhood onset pervasive developmental disorder" began between 30 months and 12 years. A third variety, "Atypical pervasive developmental disorder" was similar but lesser than the other two, and could begin at any time. Lorna Wing's