Speed-of-processing training reduces dementia risk by 25%

A 20-year study found that a specific speed-of-processing computer game significantly lowered dementia risk by 25% in older adults. The ACTIVE trial showed that at least eight hours of this game, plus booster sessions, was key. Memory and reasoning training did not yield similar results. This finding is promising but not a cure, and the exact reason for speed training's effectiveness remains unclear, though cognitive reserve is a leading theory.