BTW, do remember that the citations you linked used very small study populations (32 and 36, respectively).
I think most, if not all, studies on gifted children are more like anecdotal evidence, because these kids are difficult to find, too different to compare, a lot of times have co-morbid issues that disqualify them from study participation and may not be super stable over their lifetime.
Another huge reason for the lack of data (or little data) - no interest from the government agencies or Big Pharma companies, as studying these children doesn't reduce traffic fatalities or help sell another pill or cure a disease (those are much more important issues). So, not surprisingly, the most interesting studies with 200+ kids are either foreign (Canadian (McGill) and the French on the IQ stability) or from Princeton/Harvard that have certain independence in their research topics. I have yet to see one from the US department of education or CDC on this topic, that would be a lot broader and more reaching if it ever happens.
Unfortunately right now, this is all we have....
