Cognitive Training May Delay Dementia, Landmark Study Finds

A landmark 20-year analysis of the ACTIVE trial suggests that targeted, reinforced speed-based cognitive training may delay dementia diagnosis, offering new insight into how structured mental exercises could support long-term brain health in aging populations.

The ACTIVE Study: A 20-Year Follow-Up

Researchers publishing in Alzheimer’s & Dementia: Translational Research & Clinical Interventions determined whether domain-specific cognitive training reduces the long-term risk of Alzheimer’s disease and related dementias (ADRD) over 20 years, utilizing Medicare claims data. The study builds upon the Advanced Cognitive Training for Independent and Vital Elderly (ACTIVE) study, a four-arm randomized controlled trial.

Background and the Need for Research

With nearly half of Americans over age 85 expected to develop dementia during their lifetime, the question of whether cognitive decline can be resisted through training is critical. Recent findings indicate that improvements in thinking and processing speed have been documented in the short term, but the long-term prevention of dementia remained uncertain until now. Research into effective mental exercises has significant implications for government policy, caregiving, and healthcare costs.

Study Design and Methodology

The ACTIVE study enrolled 2,802 community-dwelling adults aged 65 years and older between 1998 and 1999. Participants were divided into four groups: memory training, reasoning training, processing speed training, and a no-contact control group. To participate, individuals needed a Mini-Mental State Examination score of 23 or higher and independence in activities of daily living. Those with recent strokes, undergoing cancer treatment, or with sensory impairments that would hinder training were excluded.

Data was linked to Medicare claims from January 1, 1999, to December 31, 2019, with a final sample size of 2,021 individuals enrolled in traditional Medicare. ADRD was identified using the Chronic Conditions Warehouse algorithm based on International Classification of Diseases codes. Researchers used cause-specific Cox proportional hazards models to assess dementia risk, adjusting for factors like age, sex, race, education, and baseline cognitive scores.

Key Findings: Speed Training with Boosters Shows Promise

Over 20 years, 48.7% of the control group received an ADRD diagnosis, while 77% of participants across all groups died during the follow-up period. The most significant result emerged when considering booster sessions. Participants in the speed-of-processing training group who received booster training experienced a 25% lower risk of diagnosed ADRD compared to the control group (adjusted hazard ratio 0.75; 95% confidence interval 0.59 to 0.95). Whereas, speed-trained participants without booster sessions showed no protective benefit (hazard ratio 1.01; 95% confidence interval 0.81 to 1.27).

Memory and reasoning training did not demonstrate a reduction in dementia risk, regardless of booster participation. Age did not significantly alter the training effects.

Real-World Implications and Practical Benefits

Speed-of-processing training focuses on visual attention and rapid information processing, skills essential for daily tasks like driving. Previous analyses of the ACTIVE cohort showed reduced at-fault motor vehicle collisions among speed-trained participants, highlighting the practical value of this intervention. The current study suggests that sustained, adaptive training targeting attention and processing speed may delay clinical dementia diagnosis.

Conclusions and Future Directions

Over two decades of follow-up, cognitive training focused on speed of processing, particularly when reinforced with booster sessions, was associated with a significantly reduced risk of ADRD. While not a cure, these interventions could extend years of independence and reduce societal burden. Further research using clinically adjudicated outcomes is warranted, as this study relied on Medicare claims data and excluded individuals in Medicare Advantage plans, potentially limiting generalizability.