“…In many previous training studies, participants who trained for 10 to 50 hr on fast-paced, visually demanding action video games showed improved performance on a variety of perceptual and cognitive measures that tap visual processing, attention, and task-switching (e.g., Green & Bavelier, 2003, 2006a, 2006b, 2007Green, Sugarman, Medford, Klobusicky, & Bavelier, 2012;Li, Polat, Makous, & Bavelier, 2009;Li, Polat, Scalzo, & Bavelier, 2010;Strobach, Frensch, & Schubert, 2012; but see also Boot, Blakely, & Simons, 2011;Boot, Kramer, Simons, Fabiani, & Gratton, 2008;Kristjánsson, 2013). Most video-game training studies compare improvements for an action-game group with those for an active control group that played a slower-paced, nonaction game (e.g., Tetris or The Sims) for an equivalent amount of time (e.g., Green & Bavelier, 2003, 2006a, 2006b, 2007Green et al, 2012).…”