________ are a group of severely disabling conditions in children that are considered to be the result of structural differences in the brain and usually apparent at birth or as the child begins to develop.

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Pervasive developmental disorders, also known as autism spectrum disorders, are conditions that are characterized by significant impairments in communication, social interaction, and repetitive behaviors. These conditions are thought to be caused by structural differences in the brain and are typically apparent from an early age. Symptom disorders, conduct disorders, and tic disorders do not necessarily involve structural differences in the brain and may have different causes and presentations.

________ Are a Group of Severely Disabling Conditions in Children