She actually said there are quite a few studies that show that IQ's at the upper end do occur more often than you would expect. That the frequency of occurring at the 99.9th percentile on an IQ test actually happens at a rate of about 1/650 as opposed to 1/1000 which the percentile rank would suggest. It just indicates that someone is at the 99.9th percentile based on the curve of the norming sample, if that makes sense. She said really high executive functioning just occurs more rarely and the areas measured are so different that it is unusual to have someone do well on all of them of them. My husband has a chemical engineering degree from MIT (that he got before optometry school) so I am guessing these skills came from him (they did not come from me;))! We also live in a suburb of Boston where there are a LOT of really bright children, they may skew the norm as well.
