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Pseudoscientific rubbish. The conclusion is entirely based on the assumption that there wouldn't have been any progress in the n-back task without brain stimulation and that is 1. pure speculation, 2. implausible because practice usually makes you better at a task. Also: placebo. The general idea that we can "unlock" more brain power by simply applying electrical currents to the brain is utterly silly.
I know of an open source developer who has written some extremely complicated kernel code and credits his success to personal tDCS experiments.<p>I still think we need more data on this.