Because individuals with autism spectrum disorder vary greatly in the degree and nature of their deficits,some researchers have proposed that ASD

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The fact that individuals with autism spectrum disorder vary greatly suggests that ASD may represent several different disorders rather than a singular disorder. Some researchers propose that autism is not one disorder, but rather a group of disorders that have similar or overlapping symptoms. This is known as the autism spectrum, and it includes disorders such as Asperger's Syndrome and pervasive developmental disorder-not otherwise specified (PDD-NOS).

Because Individuals with Autism Spectrum Disorder Vary Greatly in the Degree