ONE particular type of mental exercise may succeed at doing what nothing else has before: putting off dementia.A new, 10-year study showed that speed training — computer exercises that get users to visually process information more quickly — beat memory and reasoning exercises, two other popular brain-training techniques.Researchers found that a total of 11-14 hours of speed training has the potential to cut by as much as 48% the risk of developing dementia 10 years later.The results of the study, called Active — for Advanced Cognitive Training in Vital Elderly — were presented on Sunday at the Alzheimer’s Association International Conference in Toronto, the world’s largest gathering of Alzheimer’s researchers.The study is believed to be the first to demonstrate that a behavioural intervention can reduce the incidence of dementia.Many people practice various brain-training exercises to keep the mind limber as they age.Previous research released as part of the Active study showed all...

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