Brain Fitness Pro

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]