This is exactly it.

There seems to be a "pseudo-polymath" personality type among some engineers. Based on an unexamined but deeply held philosophical belief that engineering concepts and ways of thinking neatly generalize to all fields. The pseudo-polymath engineer is an instant expert in anything he bothers to turn his mind to and subsequently systematize.

Engineers who think they have unique outsider insight into an unrelated field like medicine or cognitive science should tread very carefully. If you can, try to validate your ideas and assumptions with a subject matter expert. Don't underestimate the large stock of knowledge and discourse that already exists in these fields.