The finding that working memory training can increase fluid intelligence triggered a great number of cognitive training studies, the results of which have been fiercely debated among experts. The finding also prompted a surge of commercial versions of these working memory training programs. Increasing Intelligence overviews contemporary approaches and techniques designed to increase general cognitive ability in healthy individuals. The book covers behavioral training and different electrical stimulation methods such as TMS, tDCS, tACS, and tRNS, along with alternative approaches ranging from neurofeedback to cognitive-enhancing drugs. It describes crucial brain features that underlie intelligent behavior and discusses theoretical and technical shortcomings of the reported studies, then goes on to suggest avenues for future research and inquiry.