Revision History

A landmark 20-year study from Johns Hopkins and the NIH found that just five to six weeks of cognitive speed training reduced dementia risk by 25%, offering the first randomized trial evidence that a brief, non-pharmacological intervention can provide lasting brain protection. Experts say the findings reinforce a growing scientific consensus that challenging the brain — through structured training, physical exercise, social engagement, and lifelong learning — is one of the most effective strategies against cognitive decline, even as debate continues over the commercial brain-training industry's broader claims.