Sandra Wisham had never heard of cognitive training until her senior center in Coral Gables, Fla., hosted a seminar on aging and invited attendees to enroll in a brain-fitness course. Intrigued, she signed up.

“I want to remain independent as long as possible,” says Wisham, 76. She works hard to keep herself physically fit, going to weekly body conditioning and Zumba classes at the retirement center. It made sense to her to do the same for her mind, she says.

Cognitive, or brain, training refers to exercises aimed at improving specific aspects of a person’s cognitive functions, such as processing speed, reasoning and memory. The exercises can be computer- or smartphone-based.

With an aging population worried about cognitive decline and dementia, such training programs have seen a burst in popularity in recent years. Consumers spent an estimated $1.9 billion on digital brain health and neurotechnology apps in 2018, a fourfold increase from $475 million in 2012, according to global data from SharpBrains, an independent market-research firm.

No magic bullet

But despite the rising interest in cognitive training, evidence of its benefits is still a mixed bag, experts say.

“There will be one study that shows a benefit, but then there will be another study that fails to show a benefit,” says Dan Press, a neurologist and director of the cognitive-neurology unit at Beth Israel Deaconess Medical Center in Boston who helps run the Brain Fit Club, a brain-training program at Beth Israel that incorporates activities such as tai-chi and yoga as well as nutrition education.

An oft-cited study, dubbed ACTIVE, for Advanced Cognitive Training for Independent and Vital Elderly, showed that speed-of-processing training — which helps people process visual information more quickly — could cut a person’s risk of developing dementia. The study looked at 2,802 healthy adults, aged 65 to 94, who received training in memory, reasoning or speed of processing or were placed into a control group. Researchers found that those in the speed-of-processing group had a 29% lower risk of developing dementia 10 years later. Researchers also found that booster sessions could be beneficial; each extra speed-training session was associated with a 10% decrease in risk.

On the flip side, a 2018 systematic evaluation of past studies on cognitive training showed that targeting brain training to areas such as memory or processing speed could help performance in those specific areas. Still, there wasn’t enough evidence to determine whether brain training alone could prevent or delay cognitive decline or dementia.

“Cognitive training has shown some promise, but people shouldn’t expect it to be a magic bullet,” says Sarah Lenz Lock, executive director of the Global Council on Brain Health, a group of cognitive-health experts funded by AARP.

Multipronged approach

That’s why it’s important to focus on what recent research says does work. For example, there is some evidence that a so-called multipronged approach — a combination of brain training, healthy diet, exercise and vascular monitoring — can improve or maintain cognitive function.

One major study looked at 1,260 adults 60 to 77 years old in Finland with mild cognitive issues or cardiovascular risk factors like high cholesterol, hypertension or obesity — things that increase the risk of developing dementia. Trial subjects were randomly divided into two groups: One received general health advice at the beginning of the trial, while the other received both general health advice and four additional services: nutritional counseling, a tailored exercise program, a cognitive-training program and consistent monitoring of cardiovascular risk factors.

After two years, researchers found that although cognition had improved in both the intervention and control groups, the intervention group showed significantly more improvement in overall cognitive function, processing speed and executive function, the cognitive domain responsible for problem solving and planning.

Wisham, who resides alone in a two-bedroom condominium unit, expects to live another two decades. She wants her remaining years to be good ones, she says.

Types of brain games

She began attending the brain-fitness course at her retirement center, offered by the Brain Fitness Pavilion, a center for cognitive training that’s part of the University of Miami Health System. She worked with two programs: Posit Science’s BrainHQ, which uses computer games to help hone a person’s processing speed, attention, memory and reasoning, and i-Function, a set of computer-based exercises that help people learn or relearn certain practical life skills, such as how to do their banking online or how to refill a prescription through a drugstore’s website.

She spent an hour or two a week working through those computer exercises. One was a speed-of-processing game called “Double Decision,” where Wisham had to simultaneously identify an object at the center of her field of view and another object in the periphery as quickly as possible. As her performance improved, the program would introduce the objects faster and throw in more distractions.

People who enroll in programs like those hope the exercises will keep them sharp mentally and perhaps delay or prevent the onset of dementia in old age. Eighty-five percent of the Brain Fitness Pavilion’s attendees are 60 or older, says its director, Philip Harvey, who’s also a professor of psychiatry and behavioral sciences at the University of Miami Miller School of Medicine.

Specter of Alzheimer’s

There are several causes of dementia, but the most common is Alzheimer’s disease, marked by a buildup of a protein called beta amyloid in the brain and the appearance of disorganized masses of protein fibers called neurofibrillary tangles inside brain cells. There is no cure for Alzheimer’s, and treatment options for most types of dementia are limited. There is no drug approved to prevent or delay symptoms.

The same goes for medical devices. The Food and Drug Administration has not yet approved any device for preventing or delaying dementia, but Posit Science Chief Executive Henry Mahncke hopes that BrainHQ, one of the programs Wisham used for brain training, will be the first.

The company has worked with researchers and scientists from academic institutions for many years to evaluate its product and potential benefits. It’s now involved in 78 trials looking at aging, and more than 60 peer-reviewed papers on aging involving BrainHQ have been published so far. The plan is to eventually submit the research data to the FDA, but that is still years away, Mahncke says.

The benefits of brain training

Even though there isn’t enough evidence to definitively state that brain training can prevent or delay dementia, it does have other potential benefits. Some studies have shown that speed training can help reduce the incidence of at-fault motor-vehicle collisions among older drivers. Others have shown that certain cognitive-training exercises can lead to improved performance in daily living activities and protect against depression.

Lenz Lock, with the Global Council, recommends what she calls “cognitively stimulating activities,” which challenge a person’s ability to think, such as volunteering or learning a new skill. She also recommends exercise and other activities that can improve cardiovascular health, something that some studies have shown can reduce the risk of developing dementia.

Wisham says her two months of brain training “made her feel great.” Ticking off the tasks in her cognitive-training program gave her a boost in confidence and made her feel more capable. It also got her out of her apartment and helped her to meet new people.

“I’d definitely do it again,” she says.