10 Hours of Brain Training Cuts Dementia Risk 25%

Imagine if a few hours of practice today could protect your brain for the next two decades. That's exactly what researchers discovered when they followed 2,802 older adults who tried a simple cognitive speed training program back in the 1990s.

The people who completed just eight to 10 hour-long sessions of brain training, plus occasional booster sessions, were 25% less likely to develop dementia over the following 20 years. The study, funded by the National Institutes of Health and published in Alzheimer's & Dementia journal, is the first gold-standard proof that we can actively reduce dementia risk through mental exercise.

George Kovach, 74, started doing these exercises a decade ago because he wanted to "take care of his neurons." He's now completed over 1,300 sessions of the online program BrainHQ. "These things are hard, but you do get better at it," he says. "I look at it like doing sit-ups."

The training works differently than typical brain games. Users watch a screen where a car or truck flashes briefly in the center while a road sign appears on the edge. They have to remember the vehicle and click where the sign appeared, all while the program adds distractions and speeds up as they improve.

Here's the fascinating part: this type of training triggers something called implicit learning, the same way your brain learns to swim or tie shoelaces. "You can learn to ride a bike in about 10 hours of training," explains Henry Mahncke, a neuroscientist at Posit Science. Even if you don't practice for 20 years, you'll still have "a bike-riding brain."

The ACTIVE study tested different types of brain exercises, including memory and reasoning games. Only the speed training group showed protection against dementia, likely because implicit learning creates more lasting changes in the brain.

Why This Inspires

What makes this discovery so hopeful is how accessible it is. We're not talking about expensive treatments or complicated medical procedures. Just 10 hours of focused practice, something anyone with a computer can do, followed by occasional tune-ups.

Dr. Marilyn Albert, a neurology professor at Johns Hopkins who authored the study, calls the results "astonishing." Jennifer O'Brien, a psychology professor at the University of South Florida, agrees: "It's super-exciting to see that these effects are still holding 20 years out."

Researchers are now studying whether more training provides even greater benefits. The ongoing PACT study has enrolled 7,500 people who will complete 45 sessions over several years instead of just 10 hours. Results are expected in 2028.

But you don't need to wait or become a mental marathoner to start protecting your brain. The science already shows that a modest investment of time today could give your neurons protection for decades to come.