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Autism is a pervasive developmental disorder often associated with an inability to speak, serious intellectual disability, and similar issues. The less extreme cases have dramatically more contact with the wider population introducing an odd form of social survival bias.

At the same time the term has been more widely applied over time to include people with minimal intellectual or linguistic impairment, but that doesn’t mean people with such profound issues no longer exist.

Thus, if you’re talking about the full autistic population overall they are going to on average be worse at basically any task.