@mattly To the extent I'm aware, I'm more on the NT end of the spectrum perhaps with some mild atypicality,, but my personal experience of "flow" isn't quite either of those things. I seem to go into a dreamlike state (in terms of "just going with it"). I feel like the part of my brain that inhibits freeform thought and connection drops into "suspension of disbelief" mode. I've only really ever entered flow state while writing prose/poetry or writing/playing music, though.