Here is a recent Cochrane review looking at high quality studies of aerobic exercise and finding no significant effect in the meta-analysis: http://www.cochran

Here is a recent Cochrane review looking at high quality studies of aerobic exercise and finding no significant effect in the meta-analysis: http://www.cochrane.org/CD005381/DEMENTIA_aerobic-exercise-to-improve-cognitive-function-in-older-people-without-known-cognitive-impairment http://www.cochrane.org/CD005381/DEMENTIA_aerobic-exercise-t...