ADHD/Autism = same thing theory?

I’ve seen it referenced on TikTok but I’m curious about the evidence. It seems pretty plausible. The same gene is involved apparently. There’s very high “comorbidity.” Even in non “AuDHDers” many of the symptoms of one (that an individual “doesn’t have”) are present. Autists can be very different from eachother and it seems like they may sometimes have more in common with some ADHDers than eachother. Dividing things into specific labels like this is kinda lib and undialectical anyway. People already realizing Aspergers and other things were just autism. “Pathological Defiant Disorder” (allegedly) seems to basically just be a common presentation of AuDHD. There’s also the monotropism theory that both tend to be high in.

This is just my uneducated opinion on something I’ve been fixated on and pondering for a little while. I’m curious if anyone has any serious evidence or more interesting thoughts. There’s probably also connections to other neurodivergences.

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