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mapnoterritory comments on Dual N-Back browser-based "game" in public alpha-testing state. - Less Wrong
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A decent (randomized, has placebo control) recent article finding no transfer here (pdf). Not saying this is the final word on dual-n-back but enough for me to spend time elsewhere until more evidence comes in....
That was an interesting read, thanks. But I laughed out loud when they explained how they increased the IQ variance of their sample. The original study worked with students from the University of Bern, a group too homogeneous with respect to intelligence. To increase diversity, the replication works with students from Georgia Tech, Georgia State University, and Michigan State University. That is playing to the stereotypes.
There's still at least 1 more study coming out, one involving Stephenson (whose 2010 thesis was one of the strongest datapoints, according to my meta-analysis). I've been told that it found transfer to fluid intelligence when using visual single n-back, but not audio n-back.