OK, OK, I reread the Marshmallow test and DD would have passed (it's been years since I originally read it, forgive me), but not nearly as young as DS would have. But it got me to thinking that what really separates the two of them is extroversion and boldness (DD). Yes, DD also presents as more impulsive, which may be due to the fact that she is a "quick processor." In contrast, DS is more introverted, methodical, and a slower processor with a higher WM.

DD's faster processing speed DOES seem to translate so far into a distinct advantage on timed tests. Time will tell if DS can manage timed tests as well as she can.

Yet despite completely different strengths and weaknesses, they have remarkably similar FSIQs and GAIs.

Really, I'd love to see more studies on HG+ kiddos to sort through all of this.