Research on pervasive development disorders (PDDs) has shown that the cause is

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Research on PDDs, such as autism spectrum disorder, has found evidence of neurological differences and abnormalities in brain structure and function. While psychological and environmental factors may also play a role in the development and expression of these disorders, the neurological differences are considered a primary factor in their cause. Familial factors, such as genetic predisposition, may also contribute to the development of PDDs. Cultural factors may impact how PDDs are understood and treated, but are not a direct cause of the disorders themselves.

Research on Pervasive Development Disorders (PDDs) Has Shown That the Cause