Or just exceptional brilliance. At the extreme end of IQ or similar scales, aspects of one's very existence become eerily similar to ADHD symptoms - except the mind isn't understimulated because of chemical imbalance; it's understimulated because the world is perceived as unbearably mundane. Similarly, social deficits may be identified as Asperger syndrome when in reality it's may be a lack of common topics/culture and a disregard for the monkeylike social dance. It takes a real expert to properly diagnose such person. See [1], [2].

[1] https://www.amazon.com/Misdiagnosis-Diagnoses-Gifted-Childre...

[2] https://www.amazon.com/Different-Minds-Children-Asperger-Syn...