McGill study shows digital cognitive exercises can rejuvenate brain chemistry linked to memory and attention.
For years, the idea that a digital ‘brain game’ could do more than mildly entertain or pass the time between Wordle rounds has been met with polite skepticism. Yet a new study from McGill University’s Montreal Neurological Institute – The Neuro – has revealed that targeted, computer-based brain exercises can do something no medication has yet achieved: restore the brain’s acetylcholine system, which underpins attention, memory and learning, to a level typically seen in people a decade younger.
The INHANCE clinical trial, published in JMIR Serious Games, is the first to demonstrate in humans that a behavioral intervention can reverse a measurable aspect of neurochemical aging. The study followed 92 healthy adults over 65, assigning them to either 10 weeks of structured training through the BrainHQ app or to play standard computer games. PET imaging revealed that only those in the BrainHQ group showed measurable improvement in cholinergic function – the delicate biochemical system that tends to decline with age and collapses in Alzheimer’s disease [1].
Longevity.Technology: The McGill team’s findings mark a shift in how we think about cognitive aging – and, indeed, about what constitutes an intervention. For years, the pharmaceutical approach to neurodegeneration has focused on compensating for loss rather than rebuilding capacity; the notion that a digital, behavioral tool could restore cholinergic function to levels seen a decade earlier borders on heresy in some clinical circles, yet here it is, backed by imaging and peer review. This is not gamified trivia or “brain training” in the coffee-break sense – it is targeted neuroplasticity, quantified. If confirmed in larger and more diverse cohorts, this could force a rethink of where the frontier of neurorestoration truly lies and who, or what, gets to cross it.
What’s particularly compelling is the implication for the wider longevity field. We already talk about exercise and diet as interventions that can roll back biological age in muscle or metabolism; now the same concept is being demonstrated, molecule by molecule, in the brain. The fact that such results come from a non-invasive, scalable and commercially available platform raises as many questions as it answers – about access, equity and the uneasy boundary between consumer wellness and clinical care. If cognitive rejuvenation can be downloaded, the debate on how to regulate and democratize it may soon prove as interesting as the neuroscience itself.
Neurochemical rejuvenation
At the heart of the study is acetylcholine – sometimes dubbed the ‘pay attention’ neurotransmitter – which facilitates communication between neurons and supports processes such as focus, learning and decision-making. Levels of this crucial molecule fall steadily with age and more sharply in neurodegenerative disease. Current dementia drugs such as donepezil attempt to compensate by preventing the breakdown of existing acetylcholine, but they do not address the underlying deficit.
Dr Etienne de Villers-Sidani, neurologist at The Neuro and senior author of the paper, explained: “The training restored cholinergic health to levels typically seen in someone 10 years younger. This is the first time any intervention, drug or non-drug, has been shown to do that in humans.”
To quantify these changes, the team used a rare imaging technique – [18F]FEOBV-PET – which traces the vesicular acetylcholine transporter, providing a direct measure of cholinergic activity. The Neuro is one of only a handful of centers worldwide able to produce and deploy this tracer, allowing the researchers to map chemical rejuvenation with unusual precision.
From puzzles to plasticity
The exercises themselves are deceptively simple: speed- and attention-based tasks that dynamically adapt to a participant’s performance. They are designed to stimulate the brain’s plasticity mechanisms – the same molecular machinery that enables learning – rather than simply test recall or logic.
“A lot of people assume crossword puzzles or reading are enough to keep the brain sharp. But not all activities truly promote neuroplasticity,” said de Villers-Sidani. “The program is already commercially available, making it an option for clinicians to discuss with patients interested in supporting brain health.”
The authors note that the intervention improved cholinergic function after just 30 minutes of daily use over 10 weeks – and that these gains were absent in the control group playing entertainment games [1]. Such specificity strengthens the case for a mechanistic effect rather than placebo or general engagement.
Beyond the pharmacological model
For decades, the dominant approach to cognitive aging has been chemical – to supplement, inhibit or stimulate neurotransmitters through medication. Yet neuroplasticity research has increasingly pointed to the possibility of “training the chemistry” rather than replacing it. Dr Henry Mahncke, CEO of Posit Science, which developed BrainHQ, said: “This is a really big deal. While we have known for some time, based on animal studies, that brain chemical systems are plastic – capable of change and improvement – this is the first confirmation in humans of an intervention that can upregulate the production of key brain chemicals.”
The distinction is significant: rather than adding external agents, these exercises appear to prompt the brain to restore its own neurochemical balance. This shift towards endogenous rejuvenation echoes broader longevity science trends, where the emphasis is moving from symptom management to repair and regeneration.
Toward cognitive longevity
The implications extend far beyond memory games. As the authors write: “This is the first demonstration that computerized cognitive training can directly influence the cholinergic system in humans.” They add that the approach “may represent a viable and scalable method to mitigate age-related cognitive decline [1].”
Mahncke went further, suggesting this approach could “demonstrate a new non-pharmacological path for addressing a host of conditions associated with deficits in brain chemistry… from cognitive aging and pre-dementia to Parkinson’s, schizophrenia, ADHD, stress and sleep disorders.” The prospect of digital interventions that modulate neurochemistry across such conditions is, if nothing else, a compelling challenge to current models of care.
Rewriting what decline looks like
If the McGill data hold up under replication, they may help redefine what ‘normal’ cognitive aging means. The possibility that targeted digital training can reverse a measurable neurochemical decline – and do so without drugs, surgery or side effects – blurs the boundary between prevention and therapy. It also repositions behavioral neuroscience not as an adjunct to pharmacology but as a peer discipline in the quest for brain longevity.
The study’s authors are already planning a follow-up trial in people with early-stage dementia. Should similar effects be observed, the implications for aging societies and public health policy will be profound – because if aging brains can be taught to behave as if they were younger, the economic, social and human dividends could be considerable.
[1] https://games.jmir.org/2025/1/e75161
