This app claims that it can increase not only your memory and mental stamina but also your score on any intelligence or standardized test. It bases its claims on a 2008 study that used dual N-back exercises, which are used in the app. These exercises make participants recall things that are presented prior to other things. For example, if you were shown a series of three numbers and were asked the second number, that would be 1-back. The recalling the first number would be 2-back, and so on. Dual n-back exercises combine visual and aural stimuli. The study found a significant increase in fluid intelligence measures – basically the ability to solve novel problems – in people who trained with a dual n-back exercise. However, a newer study looking to duplicate these results found they only applied to the specific tasks the participants used in training. [$4; iOS]
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