Dr. James Thompson blogs: So, if population measures are the best, then the established ratio of very brightest boys to very brightest girls is 8 to 1 in actuality. This is not a glass ceiling effect, nor any ceiling effect (unless possibly against boys). It is simply an observation of the state of affairs in an entire population. (And what a population: long list of high achievers available on request). Of course, if boys are late to mature, then the male advantage in adulthood could be even higher.
I will post more details about men having a 4 IQ advantage over women, and the concomitant brain volume differences, if and when such a paper gets published.
