A practical, science-based look at mild cognitive impairment, memory decline, and treatments that address the brain’s underlying regulatory systems.
You might have become concerned when you started to notice little changes in your memory. Forgetting small things. Being unable to remember whether you did something. Then comes the uncomfortable surprise when your family tell you that you’re repeating yourself, yet you have no recollection of telling the story before.
Or perhaps you have become aware that your concentration is drifting more than it once did. Worst of all, there may be a disquieting sense that you are no longer as mentally sharp as you should be.
When this happens, medically we talk of mild cognitive impairment (MCI).
MCI sits in the space between normal ageing and dementia. Individuals with MCI experience measurable changes in cognitive functioning — often involving memory, attention, or processing speed — but these changes are not severe enough to significantly impair independent daily functioning.
Importantly, MCI does not automatically progress to dementia. Some individuals remain stable for many years, and a proportion improve when the underlying factors affecting brain function are addressed.
Understanding those underlying factors is the key to making sense of memory problems and deciding what kinds of interventions are actually helpful.
Misunderstanding Memory Problems
It is tempting to think of memory as a single mental ability that simply becomes weaker with age. In reality, memory depends on the coordinated functioning of multiple biological systems.
Sleep quality, vascular health, metabolic regulation, emotional stress, inflammation, and neurological illness all influence how efficiently the brain processes information. Another important factor is depression, but it is often overlooked. When mood is low, concentration and memory often deteriorate. In clinical practice we often see depression-related cognitive symptoms mistaken for early dementia. A careful neuropsychological assessment and differential diagnosis are therefore essential.
When these underlying systems are under strain, cognitive performance declines. Stabilise and support these systems, and cognitive functioning can often improve.
Unfortunately, many widely marketed solutions to memory problems focus on the wrong target.
The Brain Training Myth
Over the past few decades, “brain training” programs have become extremely popular. These programs are usually presented as a way to exercise the brain in much the same way that physical exercise strengthens muscles.
The idea is appealing: if cognitive skills are practised regularly through puzzles or computer-based exercises, memory and thinking should improve.
In practice, the scientific evidence tells a more limited story.
Why Brain Training Alone Is Not Enough
Research consistently shows that practising cognitive exercises improves performance on those specific exercises. People who repeatedly practise memory games or attention tasks tend to become better at those games. However, the benefits do not generalise beyond the exercises themselves.
In other words, individuals often become more proficient at the particular games they practise without meaningful improvement in real-world memory, concentration, or everyday functioning. This finding has been demonstrated repeatedly in controlled studies and meta-analyses and is widely recognised in the scientific literature.
It is also important to distinguish between cognitive training and compensatory strategies. Compensatory techniques such as reminders, structured routines, notebooks, or smartphone alerts can be extremely helpful in daily life. They allow people to work around cognitive difficulties and maintain independence. But these approaches compensate for a problem rather than restoring the underlying brain systems that support memory and attention.
The Systems That Actually Support Cognition
Memory and mental clarity do not arise from isolated brain regions working independently. They depend on large-scale regulatory systems that coordinate brain activity. These systems regulate arousal, attention, emotional balance, metabolic energy, sleep, and neural signalling. When they function well, the brain can process and store information efficiently. When they become dysregulated, cognitive performance suffers.
There are several factors that commonly affect cognition, including:
- Poor sleep quality
- Depression and anxiety
- Stress and autonomic dysregulation
- Blood pressure and vascular health
- Diabetes and metabolic dysfunction
- Inflammation
- Alcohol and substance misuse
- Neurological injury and disease
Neuroscience tells us that cognition is an emergent property of a well-regulated brain. Improving memory and thinking requires stabilising the biological systems that allow the brain to function efficiently in the first place.
A Systems-Based Approach to Brain Health
Modern neuroscience increasingly supports a systems-based, network-level approach to cognitive health. Rather than focusing narrowly on training individual cognitive tasks, this perspective emphasises the importance of restoring stability across the brain’s regulatory networks.
This includes attention to sleep, metabolic health, emotional regulation, autonomic balance, and the neuromodulatory systems that influence attention and learning. Our Neuroharmonics framework is based on and developed around this systems perspective. Its central aim is to support the regulatory processes that allow the brain to operate in a stable, adaptive state. It is a structured brain health programme that is carefully tailored to the needs of each individual.
When these biological and psychological systems are functioning well, the brain is better able to maintain cognitive clarity and support the neuroplastic changes that underlie learning and recovery.
The Role of the Vagus Nerve
One of the key regulatory pathways in the body involves the vagus nerve. The vagus nerve connects the brain with major organs throughout the body and plays a central role in regulating autonomic balance — the dynamic relationship between sympathetic activation (fight/flight) and parasympathetic recovery (rest/digest).
Signals carried by the vagus nerve influence brainstem nuclei that regulate large neuromodulatory systems involved in attention, mood, and learning: noradrenaline, acetylcholine, serotonin, glutamate, and GABA. Among these are pathways involving the locus coeruleus and other systems that influence cortical activity and neural plasticity.
Vagus nerve stimulation (VNS) has been studied for several decades in neurology and psychiatry. It is used clinically in conditions such as epilepsy and treatment-resistant depression, and increasing research suggests that it can influence broader regulatory processes in the brain. Non-invasive forms of vagus nerve stimulation now allow this pathway to be engaged without surgery and can be applied easily at home.
VNS is not a treatment for MCI specifically. Rather, it is a neuromodulatory intervention that may support some of the regulatory systems involved in attention, learning, mood, sleep, and neuroplasticity. Within a systems-based approach to brain health, VNS can therefore play an important role in supporting the regulatory networks that influence cognitive functioning.
Measuring Change
A critical part of responsible clinical work is careful measurement.
Changes in cognitive functioning are monitored using formal neuropsychological assessment, allowing domains such as memory, attention, processing speed, and executive functioning to be evaluated objectively over time.
This approach allows cognitive performance to be tracked scientifically rather than relying on subjective impressions alone. In some cases, patients show that their cognitive functioning has stabilised. In others, measurable improvements in cognitive performance are observed alongside improvements in sleep, mood, and overall physiological regulation. For other patients, testing confirms the downward trend. Either way, testing provides a far more objective understanding of what is happening than relying on subjective impressions alone.
While outcomes naturally vary from person to person, these objective measurements provide an important way of determining whether interventions are genuinely supporting cognitive functioning.
In this context, it’s appropriate to mention the importance of thorough neuropsychological testing rather than the use of screening procedures. Research shows that reliance on brief cognitive screening tests alone can lead to misclassification rates of around 30–36%, with some individuals incorrectly identified as having mild cognitive impairment but this finding is not confirmed when more comprehensive assessment is performed..
A Realistic but Hopeful Perspective
Mild cognitive impairment is a complex condition, and no single intervention is universally effective, precisely because there are so many underlying causes.
Cognitive decline is influenced by a complex network of biological systems rather than a single isolated process. However, research increasingly suggests that addressing those systems can sometimes stabilise — and occasionally improve — cognitive functioning.
For this reason, early assessment with a neuropsychologist and a comprehensive, systems-based approach to treatment and brain health are important. While there is no guarantee, addressing the underlying factors that contribute to cognitive decline may help slow progression and, in some individuals, improve cognitive functioning.
When the brain’s regulatory systems are supported and stabilised, the conditions that allow cognitive functioning to improve are more likely to emerge. And that is the goal of our work at Ormond Neuroscience: creating the conditions that allow the brain to function as effectively as possible.
If you are concerned about changes in memory or thinking, contact Ormond Neuroscience to arrange a neuropsychological assessment.
Frequently Asked Questions
Can mild cognitive impairment improve?
Yes. While some individuals with MCI eventually develop dementia, others remain stable for many years, and some show improvement when underlying factors such as sleep disruption, depression, metabolic strain, or autonomic dysregulation are addressed.
Does brain training improve memory?
Brain training exercises generally improve performance on the specific tasks that are practised. However, research shows that these improvements rarely translate into meaningful changes in everyday cognitive functioning.
What causes mild cognitive impairment?
MCI can arise from many different factors, including neurodegenerative disease, vascular changes, sleep disorders, depression, metabolic problems, neurological injury, or chronic stress affecting the brain’s regulatory systems.
How is mild cognitive impairment assessed?
Assessment typically involves clinical evaluation together with formal neuropsychological testing, which measures cognitive domains such as memory, attention, processing speed, and executive functioning.
Can vagus nerve stimulation help cognition?
Vagus nerve stimulation influences brain systems involved in regulation, attention, and neural plasticity. Research in neurology and psychiatry suggests that it can affect broader regulatory processes in the brain, which support cognitive functioning. It is not a cure for cognitive impairment, but it is a powerful neuromodulatory tool that may support some of the regulatory systems involved in cognitive functioning.
Selected References & Further Reading
Bassett, D. S., & Sporns, O. (2017). Network neuroscience. Nature Neuroscience, 20(3), 353–364.
This paper outlines how brain function arises from large-scale network interactions rather than isolated regions, supporting a systems-level understanding of cognition.
Simons, D. J., Boot, W. R., Charness, N., Gathercole, S. E., Chabris, C. F., Hambrick, D. Z., & Stine-Morrow, E. A. L. (2016). Do “brain-training” programs work? Psychological Science in the Public Interest, 17(3), 103–186.
Psychological Science in the Public Interest
A comprehensive review concluding that brain-training programs improve performance on trained tasks but show limited evidence of generalisation to everyday cognitive functioning.
Melby-Lervåg, M., Redick, T. S., & Hulme, C. (2016). Working memory training does not improve performance on measures of intelligence or other measures of “far transfer”. Perspectives on Psychological Science, 11(4), 512–534.
Perspectives on Psychological Science
A meta-analysis demonstrating that working memory training does not generalise to broader cognitive abilities such as intelligence, reinforcing the limits of task-based training.
Petersen, R. C., et al. (2018). Practice guideline update summary: Mild cognitive impairment. Neurology, 90(3), 126–135.
Clinical guidelines describing the diagnosis, prognosis, and variability of MCI, including the fact that not all cases progress to dementia and some may remain stable or improve.
Livingston, G., Huntley, J., Sommerlad, A., Ames, D., Ballard, C., Banerjee, S., … Mukadam, N. (2020). Dementia prevention, intervention, and care: 2020 report of the Lancet Commission. The Lancet, 396(10248), 413–446.
A landmark report highlighting multiple modifiable risk factors and emphasising that cognitive decline is influenced by interacting biological and lifestyle systems rather than a single cause.
Vonck, K., Raedt, R., Naulaerts, J., De Vogelaere, F., Thiery, E., & Van Roost, D. (2014). Vagus nerve stimulation: 25 years later! What do we know about the effects on cognition? Neuroscience & Biobehavioral Reviews, 45, 63–71.
Neuroscience & Biobehavioral Reviews
Reviews the broader effects of vagus nerve stimulation, including its influence on cognition and neuromodulatory systems, beyond its established use in epilepsy.
Groves, D. A., & Brown, V. J. (2005). Vagal nerve stimulation: A review of its applications and potential mechanisms. Neuroscience & Biobehavioral Reviews, 29(3), 493–500.
Neuroscience & Biobehavioral Reviews
Explains how vagus nerve stimulation influences brainstem and neuromodulatory pathways involved in attention, mood, and neural plasticity.
Areán, P. A., Ayalon, L., Hunkeler, E., Lin, E. H. B., Tang, L., Harpole, L., … Unützer, J. (2005). Improving depression care for older, minority patients in primary care. Medical Care, 43(4), 381–390.
Demonstrates the significant impact of depression on cognitive functioning in older adults, supporting the need for careful differential diagnosis in cases of suspected cognitive decline.
