A ten-week online brain training programme helped older adults’ brains act as though they were a decade younger, a recent study has found.

Much like exercise for the body, regular mental workouts can help keep the brain in shape. As we age, brain processes that support memory, attention and decision-making can become less efficient. Keeping the mind active is thought to build a reserve that helps people cope better with these age-related changes.

Studies suggest that people who stay mentally, physically and socially active have a lower risk of developing dementia. For example, in a study involving 120 older adults, those who engaged in regular aerobic exercise had larger brain volumes and better cognitive performance than those who were less active, reversing age-related loss in brain volume over a couple of years.

Studies have also found that brain training can improve older adults’ cognitive performance.

The latest study adds to what we know by testing whether brain training programmes – BrainHQ, in this instance – can change the brain’s chemistry, offering biological clues about how brain training might work.

BrainHQ is a brain training app that offers short, game-like exercises that train cognitive skills such as attention, memory and brain speed. As users improve, the challenges get harder, pushing the brain to adapt – much like increasing the weights during a workout.

Ninety-two healthy adults from Canada, 65 and older, took part. Half of them completed brain training exercises using BrainHQ for 30 minutes a day, five days a week, over ten weeks. The other half, a comparison group, spent the same amount of time playing games designed just for entertainment, such as solitaire.

To see whether the programme made a difference to the brain, all participants had specialised scans before and after the ten weeks of training. These scans can detect tiny chemical changes in brain activity.

The researchers focused on a region called the anterior cingulate cortex, which plays an important role in attention, learning and memory. Those who completed the speed-based exercises showed stronger activity in this area compared to those in the comparison group. The change in brain chemicals seen is described by the researchers as equivalent to shaving ten years off their biological age.

Ageing and cognitive decline (including Alzheimer’s disease) are often linked to reduced activity in this part of the brain. Strengthening it may therefore help delay or reduce cognitive decline and lower the risk of developing dementia later in life.

Although the results look promising, we should be careful about how we interpret them. The study measured many different outcomes. Although the brain training group showed increased activity compared with their own baseline, the difference between the two groups was not statistically significant.

Because the study looked at so many outcomes and involved only a small number of people, some of these changes may simply be due to chance rather than real effects of the training.

With ageing, there is often a decline in part of the brain called the anterior cingulate cortex. LightField Studios/Shutterstock.com

The bigger picture

This was a small study involving healthy, mostly white older adults, and it looked at one specific brain training app. The findings may not apply to people with memory problems or to other types of brain-training programmes, or to longer-term outcomes.

This intervention is relatively short. Research found that most interventions aiming to improve cognitive performance that are successful typically last at least four to six months. Longer-term participation is almost certainly key to achieving lasting improvement in brain health.

Studies like this rely on brain scans as early indicators of benefit, but it remains to be seen whether these biological changes translate into lasting improvements in functioning. Researchers are testing whether similar brain-training programmes can help people who show early signs of dementia. These studies will reveal whether boosting brain activity this way can slow cognitive decline in those already showing symptoms.

High-intensity interventions – such as the one tested that required two and a half hours of training per week – may not suit everyone.

For example, people with existing cognitive concerns who want to improve their cognitive wellbeing may struggle to access digital programmes. They may need more community-based, supportive and lower-intensity interventions. To be an effective dementia programme, recruitment needs to be inclusive, especially reaching people from underserved groups who are at the highest risk.

Cognitive ageing is shaped by many factors – including physical activity, social connection, healthy diet and mental wellbeing – so brain training is likely to be just one part of a broader approach to supporting brain health and dementia prevention. Keeping the mind active may not stop ageing, but it could help the brain stay younger for longer.