Creator: Help Dementia Editorial Team
Published: 2026-05-30T10:24:20

Reviewed by the Help Dementia Editorial Team — our editors review every article for accuracy against guidance from the National Institute on Aging, the Alzheimer’s Association, and peer-reviewed sources.

Brain training sits at the center of this dementia and brain health question.

The short answer is: research shows that certain types of brain training *can* reduce dementia risk—but probably not the apps in your smartphone. A landmark study found that people who completed 14-22 hours of a specific type of cognitive training experienced 25% lower risk of Alzheimer’s disease and dementia over two decades. However, this finding comes from a controlled scientific study using a targeted training program, not from consumer brain training apps, most of which have never been tested in research studies at all. The distinction matters enormously if you’re considering brain training as dementia prevention.

The ACTIVE study (Advanced Cognitive Training for Independent and Vital Elderly) enrolled 2,832 generally healthy people age 65 and older in a rigorous, NIH-funded trial that followed participants for 20 years. The results were genuinely significant. But what worked in that study may not be what you get when you download a brain training application. The gap between “proven effective in research” and “available to buy” is where the real story lies. This article breaks down what the evidence actually says, what it doesn’t say, and how you should think about brain training as part of dementia prevention—alongside the other approaches that have stronger evidence behind them.

What the ACTIVE Study Discovered About Brain Training and Dementia Risk
The Critical Gap Between Research Findings and Commercial Brain Training Apps
Which Type of Brain Training Actually Works—And What Doesn’t
What Broader Research on Mental Activities and Dementia Risk Reveals
Why Booster Sessions Matter More Than You Might Think
Beyond Brain Training: What Else Matters for Dementia Prevention
Should You Use Brain Training Apps? A Practical Framework for Decision-Making
Conclusion

What the ACTIVE Study Discovered About Brain Training and Dementia Risk

The strongest evidence we have comes from the ACTIVE study, which is worth understanding in detail because it’s often cited but frequently misrepresented. Researchers randomly assigned 2,832 cognitively normal older adults to receive either cognitive training or no training. One group received speed-of-processing training—a computer-based program that teaches people to quickly identify and locate objects on a screen while tasks become progressively more difficult and fast-paced. This wasn’t casual gaming; it was structured, systematic training. The follow-up was unusually long, tracking participants for up to 20 years. When researchers analyzed dementia diagnoses during that period, they found that those who completed the speed-of-processing training had a 25% lower risk of being diagnosed with Alzheimer’s disease and dementia compared to the control group.

That’s a meaningful reduction—not a cure, but a clinically important difference. The training wasn’t quick, either; participants who benefited typically completed 14-22 hours of initial training. The study was published in 2026 after decades of data collection, which is why the long-term benefits are so noteworthy. What makes this finding credible is the study design. The ACTIVE study was a randomized, controlled trial funded by the National Institutes of Health—the gold standard for medical research. Participants were healthy at baseline, reducing the possibility that the results were driven by people who were already at risk or already showing cognitive decline. The researchers who conducted the follow-up analysis in 2026 used rigorous methods to confirm the long-term connection between the training and dementia risk reduction.

What the ACTIVE Study Discovered About Brain Training and Dementia Risk

The Critical Gap Between Research Findings and Commercial Brain Training Apps

Here’s where the conversation usually goes wrong: the ACTIVE study tested one specific training program in a controlled research setting. The majority of commercial brain training games and apps available today have never been tested in any research study, let alone in a 20-year randomized controlled trial. This is an essential distinction that gets lost in headlines. When companies market brain training apps, they’re not claiming to replicate the ACTIVE intervention. They’re selling games designed to be engaging and, theoretically, stimulating. Apps like Lumosity, Elevate, Peak, and countless others use different designs, different difficulty progressions, and different cognitive demands than what was tested in the ACTIVE study.

Some claim to be based on neuroscience; some claim to help memory, attention, or general cognition. But “claims based on neuroscience” and “proven in a 20-year clinical trial” are not the same thing. The Alzheimer’s Society is direct about this: very little high-quality, long-term research exists proving the effectiveness of brain training apps currently available to consumers. A company might say their app uses principles derived from cognitive psychology, but that’s different from that specific app being tested and shown to reduce dementia risk. You wouldn’t take a medication just because it contains an ingredient that worked in a clinical trial if the medication itself was never tested. The same logic applies here. The ACTIVE study is genuinely important evidence that cognitive training can help—but it’s not a blanket endorsement of whatever brain training app is trending this month.

Which Type of Brain Training Actually Works—And What Doesn’t

Not all cognitive training is equal. The ACTIVE study tested three different types: memory training, reasoning training, and speed-of-processing training. Only one of them reduced dementia risk. Speed-of-processing training is the winner here, and it’s important to know what that actually is. Speed-of-processing training teaches people to rapidly identify visual details and react to increasingly complex visual tasks within shrinking time windows.

It’s less about “remembering facts” or “solving logic puzzles” and more about training your visual-processing speed and your ability to manage complex information quickly. In practical terms, it might involve spotting where a target object appears on a screen while other distracting objects appear around it, and doing this faster and under more challenging conditions as you progress. This is surprisingly specific—and it’s different from the memory games or puzzle games that dominate the commercial brain training market. The reasoning training and memory training groups in the ACTIVE study didn’t show the same dementia-prevention benefits, even though they were cognitively demanding in other ways. This is crucial: it means that any brain training effect on dementia risk isn’t simply “use your brain and you’ll be fine.” It appears to be related to something specific about speed-of-processing training. If an app is marketing memory improvement or reasoning improvement as dementia prevention, it’s reaching beyond what the evidence actually supports.

Which Type of Brain Training Actually Works—And What Doesn't

What Broader Research on Mental Activities and Dementia Risk Reveals

While the ACTIVE study is the most rigorous evidence, it’s not the only research on cognition and dementia risk. A systematic review of 22 population-based studies found that mental activities—broadly speaking, things like reading, writing, playing games, doing crosswords, or using computers—were associated with a 46% lower risk of developing dementia over a median follow-up period of 7 years. That’s a large reduction and suggests that general cognitive engagement matters. This is important context because it means you don’t have to buy a fancy app to benefit. The broader research suggests that almost any mental activity that engages your brain can lower dementia risk.

Reading challenging books, learning a new language, taking classes, playing chess, writing, or even having intellectually engaging conversations appears to be protective. The ACTIVE study shows that specific speed-of-processing training offers particular benefits, but the broader research suggests that many forms of mental engagement help—and most of them don’t cost anything. The difference between a 46% reduction (from broad mental activities) and a 25% reduction (from speed-of-processing training specifically) is worth noting, though both are substantial. It’s possible that speed-of-processing training is particularly efficient, or it’s possible that the ACTIVE study, by being so well-designed, found a more reliable effect. Either way, the takeaway is that dementia prevention isn’t about one magic app or one special technique. It’s about sustained mental engagement.

Why Booster Sessions Matter More Than You Might Think

One finding from the ACTIVE study that often gets overlooked is this: the 25% reduction in dementia risk required not just initial training but ongoing “booster” sessions. Participants who completed the initial speed-of-processing training but didn’t continue with periodic booster sessions didn’t see the same dementia-prevention benefits. This is a major detail because it suggests that cognitive training isn’t a one-time vaccine against dementia. It appears to require sustained effort. This makes intuitive sense: your brain changes based on use, but those changes aren’t permanent if you stop using your brain in that way. It’s similar to physical fitness—you can build cardiovascular capacity through running, but that capacity declines if you stop running.

The ACTIVE study suggests that whatever neurological benefit comes from speed-of-processing training needs to be maintained through ongoing practice. If you’re considering brain training as dementia prevention, this is crucial to understand: it’s a long-term commitment, not a short-term intervention. The practical implication is humbling: you can’t do 14 hours of brain training and then coast on those benefits for 20 years. You need to keep engaging, keep practicing, keep challenging your cognitive processing. For many people, that’s harder than a single intensive training period. This is why apps that hook you into ongoing use might theoretically have an advantage—they’re designed for habit formation. But again, only if those apps are actually training the types of cognition that matter, which most consumer apps haven’t been proven to do.

Why Booster Sessions Matter More Than You Might Think

Beyond Brain Training: What Else Matters for Dementia Prevention

Brain training is one piece of dementia prevention, but it’s just one piece. Other factors with strong evidence include cardiovascular fitness, cognitive complexity, social engagement, sleep quality, hearing correction, blood pressure management, and dietary patterns. If you’re serious about dementia prevention, brain training shouldn’t be your only strategy—and it shouldn’t replace approaches with even stronger evidence behind them. The Mediterranean diet, for example, has substantial evidence supporting cognitive benefits. Regular aerobic exercise has strong evidence for brain health.

Social engagement and meaningful relationships show protective effects. Correction of hearing loss in older adults has been associated with reduced dementia risk. These aren’t as trendy as a brain training app, and they don’t generate the same marketing excitement. But they’re not mutually exclusive with brain training—they’re complementary. A realistic dementia-prevention approach might include some form of cognitive engagement (which could be a brain training app, but could also be learning a language, playing chess, or writing), combined with cardiovascular exercise, cognitive challenge in your work or hobbies, strong social connections, and attention to other health factors.

Should You Use Brain Training Apps? A Practical Framework for Decision-Making

Given everything above, how should you think about brain training apps? If you enjoy them and find them engaging, there’s no harm in using them—assuming you have access to good medical care, you’re managing other health factors, and you’re not spending money you don’t have on an app when free alternatives exist. An app that keeps you mentally engaged and motivates you to practice regularly is theoretically better than no cognitive engagement at all. But be realistic about what you’re buying.

You’re not buying the ACTIVE intervention; you’re probably not buying something tested in any clinical trial. You’re buying a tool that might keep your mind active if you use it consistently. That tool is competing with many other free or low-cost ways to keep your mind active: joining a chess club, learning an instrument, taking classes, writing, volunteering, or having stimulating conversations. Before spending money on a brain training app, consider whether those alternatives might be more enjoyable, more social, or simply more engaging for you—because engagement and enjoyment are what will keep you doing it long-term.

Conclusion

The evidence on brain training and dementia prevention is more nuanced than headlines suggest. The ACTIVE study provides the strongest evidence to date that specific types of cognitive training—particularly speed-of-processing training—can reduce dementia risk, lowering it by about 25% over a 20-year period. But this finding comes from a controlled research trial of a specific program, not from consumer brain training apps, which remain largely untested. If you want the proven intervention, you’d need access to the specific speed-of-processing training used in that study, ongoing booster sessions, and probably 14-22 hours of initial effort—and you’d need to sustain it over time.

For most people, the practical takeaway is this: keep your brain active and engaged through whatever means you enjoy and will stick with. That could include brain training apps, but it could equally include reading, learning, social engagement, new hobbies, or work that challenges you. Combine cognitive engagement with cardiovascular exercise, strong social connections, and attention to other health factors. Brain training matters, but it’s one part of a larger approach to protecting your brain health as you age.