Re: stuttering, the only person I knew who stuttered was highly gifted, particularly in verbal areas. He was an excellent writer and eventually was fluent in five languages. In his childhood, I don't think anyone listening to him would have predicted those outcomes.
I've seen a couple of papers reporting as much as one standard deviation of difference in IQ in stuttering boys compared to general population. So yes, I agree there is a connection and it is almost always positively correlated with intelligence. I wonder what it is that ties the two together. How are expressive speech disruption and high IQ related?
