" The 20 studies included here were all completed between 2008 and 2013....Sample sizes of treatment groups varied between 7 and 36 participants, and control groups between 8 and 43"
"net effect of n-back training on Gf outcome measures, about the equivalent of 3–4 points on a standardized IQ test"
ie: very small groups, tiny effect. Sounds dubious to me, like much research in the social "sciences"
Improving fluid intelligence with training on working memory:a meta-analysis http://scottbarrykaufman.com/wp-content/uploads/2014/08/au-e...