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Matson, Johnny L.; Kozlowski, Alison M. – Research in Autism Spectrum Disorders, 2010
Autistic regression is one of the many mysteries in the developmental course of autism and pervasive developmental disorders not otherwise specified (PDD-NOS). Various definitions of this phenomenon have been used, further clouding the study of the topic. Despite this problem, some efforts at establishing prevalence have been made. The purpose of…
Descriptors: Etiology, Physical Development, Autism, Child Development