When reading messages on this forum and most others I can find that cover exceptionally and profoundly gifted kids, it seems that there's a very high correlation between high IQ and a diagnosis of autism, sensory processing disorder, hyperactivity, oppositional defiant disorder or other atypical neurological condition.
The fact that so many gifted child have sensitivity issues aligns well with Dabrowski's Overexcitabilities and Theory of Positive Disintegration. However, it runs completely contrary to our local school, which assures me that it's not normal for gifted kids to have emotional or behavior problems.
I'm curious how many people here have exceptionally or profoundly gifted children (IQ >= 145, percentile >99.9%) who otherwise consider their children typical neurologically, socially and behaviorally.