Researchers claim a single 10-hour session of visual “speed-training” cuts AD risk by about half: http://www.wsj.com/articles/this-brain-exercise-puts-off-dementia-1469469493 The exercise used in the study was developed by researchers but acquired by Posit Science, of San Francisco, in 2007. A more user-friendly version of the game, called Double Decision, is now part of the company’s BrainHQ online service, a cognitive-training program. A monthly subscription, which includes access to Double Decision, is $14 a month, or $96 a year. Posit Science says the company intends to file a medical-device application to the Food and Drug Administration based on the recent clinical trial findings. In Double Decision, users must identify an object at the center of their gaze and simultaneously identify an object in the periphery. As players get correct answers, the presentation time speeds up, distractors are introduced and the targets become more difficult to differentiate. Seems hard to believe.