[karllager]

The trouble with this study - if I should guess - is selection bias: How many of those high IQ individuals are actually member of Mensa?

Given some test many years ago, I might have been qualified to become a member of this club - but never tried, as I would like to see people as people and not people as their brains, only. Maybe Mensa selects for those who are anxious about their abilities and find the notion of the club card in some way - soothing.