“Dual n-Back FAQ § Other Effects”, Gwern2009-03-25 (, , ; similar)⁠:

A compendium of DNB, WM, IQ information up to 2015.

Between 200816ya and 201113ya, I collected a number of anecdotal reports about the effects of n-backing; there are many other anecdotes out there, but the following are a good representation—for what they’re worth.