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A 20-year study involving 2,800 healthy adults aged 65 and older found that those who completed specific computerized speed training, which involved quickly identifying flashing objects, lowered their risk of dementia and Alzheimer’s disease by 25% compared to a control group. Participants in the speed training group initially received five weeks of two weekly sessions, and the group that showed the most benefit also received eight additional “booster” sessions across the following three years. This training, called Double Decision, focuses on improving visual speed, divided attention, and peripheral vision; researchers theorize the reduced risk is due to procedural learning, which drives a lasting, fundamental change in the brain similar to learning a skill like riding a bicycle.