Brain training apps (computer or mobile phone applications and games) promise to improve your memory and attention skills, ability to make good decisions, and even vision and hearing. There are numerous products on the market (Brain HQ, Lumosity, Cogmed, Project: EVO, etc.) and the claims of these companies are tantalizing: Who wouldn't want to get smarter by playing a game on their phone? While many of these products originate from scientific research that has shown positive effect in some individuals, the effectiveness of these apps are highly controversial.
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This CL Answer initially posted on 2/20/2018.