Cognitive Speed Training May Lower Alzheimer’s Risk, Study Finds

The risk of Alzheimer’s disease and related dementias may be reduced among older adults who engage in cognitive speed training, particularly when paired with booster sessions, according to research published February 27, 2026, in Alzheimer’s & Dementia: Translational Research & Clinical Interventions. The findings, stemming from a long-term follow-up of the ACTIVE study, suggest a potential avenue for mitigating cognitive decline, though researchers emphasize that not all types of cognitive training yielded the same benefits.

Speed of Processing: A Key Factor

The study, directed by Marilyn S. Albert, PhD, of Johns Hopkins School of Medicine, followed 2,021 generally healthy adults aged 65 to 94 for up to 20 years. Participants were divided into groups receiving training focused on processing speed, memory, or reasoning, alongside a control group receiving no intervention. The core finding revealed that while memory and reasoning training showed no significant impact on dementia risk, speed training – specifically when combined with booster sessions at 11 and 35 months after initial training – was associated with a statistically significant reduction in diagnoses of Alzheimer’s disease or related dementias.

The speed training component involved a computerized task, part of the BrainHQ suite of cognitive exercises from Posit Science, designed to improve visual attention and the ability to quickly switch focus between different types of information. Previous research has demonstrated improvements in cognitive performance with this type of training, but the long-term impact on dementia risk remained unclear until now.

“When the study was started over 20 years ago, the goal was to see whether or not, if you did various kinds of cognitive training, it might generalize to people being more independent in their daily lives,” Albert told Healio. “Subsequently, the investigators decided they would see if this had an impact on dementia.”

How the Study Worked

Participants in the speed training group engaged in up to 10 sessions of 60-75 minutes each, working in compact groups. The training was designed to become progressively more challenging as participants improved, constantly pushing them to enhance their speed, and accuracy. Booster sessions, offered at 11 and 35 months, aimed to reinforce these gains. The control group received no cognitive training. Researchers tracked dementia diagnoses using Medicare claims data over the 20-year period, accounting for a high mortality rate (77%) with an average age at death of 83.9 years.

Unadjusted hazard ratios revealed a 0.75 reduction in risk for Alzheimer’s disease and related dementias for the speed training group *with* booster sessions, compared to the control group. The speed training group *without* booster sessions showed a less pronounced, non-significant reduction in risk (hazard ratio of 0.97). Memory and reasoning training, with and without boosters, did not demonstrate statistically significant benefits.

What Does This Mean for Brain Health?

The findings suggest that targeting processing speed through cognitive training may build “brain reserve,” a concept referring to the brain’s ability to cope with damage or age-related changes. Albert hypothesizes that the speed training may strengthen brain connectivity, providing a buffer against cognitive decline. “We do not know what changes in the brain may underlie this lower risk for dementia,” she explained. “One guess is that there was improved brain connectivity from the initial task, and when they had the booster sessions, that was strengthened.”

However, it’s crucial to note that this study does not establish a causal link between speed training and reduced dementia risk. While the association is compelling, other factors – lifestyle, genetics, vascular health – undoubtedly play a role. The researchers too acknowledge that the observed benefits may be related to the dose of training received, with booster sessions appearing to amplify the effect.

Beyond Speed: The Role of Multi-Domain Interventions

Interestingly, the lack of benefit from memory and reasoning training highlights the importance of targeting specific cognitive domains. Sheena Aurora, MD, Vice President of Medical Affairs at the Alzheimer’s Association, points to the importance of a multi-domain approach to brain health. The U.S. POINTER study, for example, demonstrated that a comprehensive intervention combining cognitive training with exercise, diet, and social engagement yielded more significant cognitive benefits than any single component alone.

“Additional studies are needed to understand why and how the speed of processing training with boosters may reduce risk for dementia diagnosis and to understand why the reasoning and memory interventions, as well as the speed training without boosters, did not have the same 20-year results,” Aurora stated.

What’s Next in Dementia Prevention?

The ACTIVE study findings add to a growing body of evidence suggesting that lifestyle interventions can play a role in reducing dementia risk. Researchers are now focused on unraveling the underlying mechanisms by which speed training exerts its protective effects. Future studies will likely explore the impact of different training protocols, the optimal timing and duration of booster sessions, and the potential for combining speed training with other brain-healthy behaviors.

For individuals concerned about their cognitive health, experts recommend engaging in regular physical exercise, maintaining a healthy diet, staying socially active, and challenging the brain with mentally stimulating activities. Discussing cognitive health with a healthcare professional is also crucial, particularly for those with risk factors for dementia.

For more information:

Marilyn S. Albert, PhD, can be reached at [email protected].