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Jonathan_Graehl comments on N-back news: Jaeggi 2011, or, is there a psychologist/statistician in the house? - Less Wrong
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Comments (22)
There's no passive control because there are only 62 kids. Only spend as many kids as it takes to publish.
I would not expect a generalized training effect. Almost nothing exhibits cross-test training. People are excited about n-back because it is the only test that is said to.
If you believed single n-back was going to definitively beat the active control, then you wouldn't pay for a passive control. I buy that. But now that it hasn't, it's worth adding a passive control.
Some apparently randomly chosen training task (vocabulary and trivia memorization) exhibited just as much generalized training as single n-back. In your interpretation, neither had any generalized benefit, then - the improvement is just due to normal ~9yr old child development over the timespan.
I do recall hearing some credible evidence that dual n-back (whatever configuration was in some older Jaeggi study) gave a boost to "fluid intelligence". (thus the interest in the topic). But now I'm given to mistrust Jaeggi more than I would the average influential researcher.