I believe, and hope that she'll forgive me if I'm misinterpreting, that Dr Ruf's thought was that you could improve the IQ score, perhaps even in a sustained manner with continued practice, but you would not be changing your actual functioning in day to day life in terms of your intellect and ability to do things that require that intellect.
One thing that I would like to see more of in these studies is a greater breakdown of the correlation between measures for various groups. I.e. - the overall correlation was x, but what was it for subgroups and, in those that so have that, how many false negatives were there vs false positives.
