That was half the claim. The full claim was that it improves fluid intelligence by improving working memory. The title of Jaeggi 2008 is "Improving fluid intell

That was half the claim. The full claim was that it improves fluid intelligence by improving working memory. The title of Jaeggi 2008 is "Improving fluid intelligence with training on working memory". http://www.pnas.org/content/105/19/6829.abstract http://www.pnas.org/content/105/19/6829.abstract