One of the biggest issues with identifying cause (and many other topics around autism) is that we apply the term "autism" to a wide range of individuals. You ha

One of the biggest issues with identifying cause (and many other topics around autism) is that we apply the term "autism" to a wide range of individuals. You have some who are incredibly high-functioning that qualify primarily due to their lack of social ability. On the other end, you have some who are entirely non-verbal and often non-communicative in any form, entirely unable to care for themselves, and often have accompanying medical issues (gastro, immunity, etc.). We call both autism, yet they are entirely different other than a few shared characteristics. Is it likely that both groups have the same cause?