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Autism is a neurobiological disorder. The structures of the brains of people with autism are atypical. Research is pointing to differences in overall brain size and the numbers of certain cells; to abnormalities in the cerebellum that affect motor, sensory, language, cognitive and attention functions; and to altered genes that interfere with brain development. A new “underconnectivity theory” suggests that autism interferes with efficient integration, timing, and synchronization of brain activation patterns. Autism, or the umbrella term, Autistic Spectrum Disorders (ASD), is not one thing but many. Like SPD and LD, the term autism encompasses a wide array of symptoms. In broad terms, autism is a Pervasive Developmental Disorder (PDD) that affects verbal and nonverbal communication, social interaction, imagination, and problem-solving.
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Carol Stock Kranowitz (The Out-of-Sync Child: Recognizing and Coping with Sensory Processing Disorder)