When it comes to autism, few questions spark as much debate as how best to support autistic people with the greatest needs.

It’s been more than three years since the Lancet Commission proposed the new term “profound autism” to describe the subset of the autism spectrum most disabled by the disorder. This label has been ...

A first-of-its-kind study released Wednesday shows the rate of “profound” autism is rising, though far slower than milder autism cases. “It’s very important to know how many people have profound ...