The study was NIH-funded and drew on expertise from Johns Hopkins, NYU Langone, and other leading centers.

Independent experts stress the results are valuable long-term data but should be interpreted cautiously due to limitations, including reliance on health-record diagnoses and exclusion of some participants with impairments.

Double Decision is presented as a low-cost, evidence-backed tool within a broader dementia-prevention context, while acknowledging the need for replication.

Initial results were reported by Lynn Pindres and colleagues in the cited journal.

The article cautions against broad claims about consumer brain-training products and recommends medical advice for individual health decisions.

Experts highlight the causal inference from the randomized design and the potential to scale adaptive online training to amplify benefits.

A long-term randomized trial found that adults who underwent speed-training and completed booster sessions had about a 25% lower risk of dementia by the study’s end, suggesting sustained, adaptive processing-speed training may help reduce dementia risk.

Findings were published in Alzheimer's & Dementia: Translational Research & Clinical Interventions, with authors urging cautious interpretation and more research to confirm results.

The study involved institutions like Johns Hopkins, University of Pennsylvania, and University of Washington, highlighting collaboration across top centers.

Posit Science researchers expressed optimism about the findings and potential public-health implications if validated.

The ACTIVE trial followed more than 2,800 dementia-free adults with an average age in the mid-70s across six US communities to test three cognitive-training approaches against no training.

Experts caution that dementia diagnoses were drawn from health records rather than clinical testing, so the study does not prove prevention or identify specific dementia types.