My son is profoundly gifted, although he's not in the same league as some of those children described in the study. I absolutely consider him a special-needs child. He's been kicked out of two schools (including a "gifted" school) at this point for his behavior, but it turns out his behavior was because he was profoundly bored. His current school accelerated him by 2 grades and now he's more manageable. He's still bored, but at least he feels like his classmates are more his level, even though he probably needs to skip 1 or 2 more grades to match his academic abilities. I'm loathe to accelerate him further because I worry about emotional well-being, being the youngest kid in the class, but this study has given me food for thought. Thank you OP for posting this.