To anyone interested, Gwern also did some extensive research on Dual N-Back. Gwern’s DNB FAQ[0] offers some favorable opinion on DNB (in that it’s fascinating,

To anyone interested, Gwern also did some extensive research on Dual N-Back. Gwern’s DNB FAQ[0] offers some favorable opinion on DNB (in that it’s fascinating, though much larger gains can be achieved via many other means—meditation, environmental changes, etc.—before DNB can start to give any meaningful effect). Later meta-analysis[1] links post-DNB IQ gains to methodological problems in studies, with quite small remaining positive effect that may be linked to further biases. (Note that currently the FAQ is marked “unlikely” and the meta-analysis is marked “highly likely”.) The results are overall not so rosy and I personally am under the impression that DNB is of little utility, if not a waste of time or highly depending on luck[2]. Some of the links from https://www.quora.com/How-does-dual-n-back-actually-increase-IQ https://www.quora.com/How-does-dual-n-back-actually-increase..., however, lead to studies supporting DNB’s reputation as a great way to increase anyone’s IQ. I don’t know if newer studies avoid the biases of the ones Gwern looked at. [0] https://www.gwern.net/DNB%20meta-analysis https://www.gwern.net/DNB%20meta-analysis [1] https://www.gwern.net/DNB%20FAQ#n-back-in-general https://www.gwern.net/DNB%20FAQ#n-back-in-general [2] There are many options on how to do DNB exercise, including test presentation, features, training length, and so on.