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Autism Spectrum Disorder by Todd T. Eckdahl

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CHAPTER 1

Symptoms and Diagnosis

Describing autism as a spectrum expresses the view that the three developmental disorders of autism disorder, Asperger’s syndrome, and pervasive developmental disorder not otherwise specified (PDD-NOS), are closely related, and produce a spectrum of overlapping symptoms. It also captures the observation that there is considerable variation in the primary symptoms and health complications of autism spectrum disorder (ASD) that produces a spectrum in the severity of functional impairment experienced by children and adults with ASD. The manifestations of verbal and nonverbal social communication deficits and restricted and repetitive patterns of behaviors, interests, or activities are different for each child with ...

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