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To examine the effects of cognitive training in elders, researchers randomized more than 2800 community-dwelling older adults (mean baseline age, 73.6 years) to one of four training groups: memory, reasoning, speed-of-processing, or a no-contact control group. Training occurred over roughly 12 hours spanning 6 weeks. A subset of participants received booster training at the end of years 1 and 3.
At 10 years, the 44% of participants who remained in the study underwent testing in all three domains (average age at testing, 82 years). Those who had undergone memory training did no better on memory tests than the other groups. The reasoning and speed-of-processing groups maintained the initial improvement in their areas of training and also benef…