[ryanferg]

This is really great! I'll have to look into this when I have a little while. Thanks for passing it on. Just on a glance, I disagree that it really shows much of an increase though. Just glancing at the forest plots of those effect sizes tells me that this isn't a very strong effect at all (if it's there).

And there is also the so called 'file drawer' effect. I was at one of the big cog psych conferences a few years ago when a colleague was asking around -'Do you have any failed to replicates for WM training?' Everyone was so excited with the original Jaeggi 2008 paper, went out and tried it, and had a tough time replicating what turned out to be a severely flawed study.

[ryanferg]

Not to say that I'm not open to the idea. I'd love for it to be true, I just think large-effect-size effects are not often mired in the controversy that this one is. They're hard to find.