Social Connection and Cognitive Health: More Than a Feel-Good Finding
Social isolation shows up repeatedly in dementia risk research. The mechanisms proposed are more concrete than the topic's soft reputation suggests.
Index
All articles
Every piece we have published, newest first. Each one lists its topic, publication date and approximate reading time.
Why We Forget: Decay, Interference and the Case for Forgetting Being Useful
Forgetting is usually treated as a malfunction. The research suggests it is closer to a feature — and understanding the mechanisms explains which lapses are worth worrying about.
Blood Pressure and the Brain: One of the Best-Supported Modifiable Risks
Midlife hypertension is among the most consistently identified modifiable risk factors for later cognitive decline — and one of the few where trial evidence exists.
Mindfulness and Attention: A Fair Reading of a Contested Literature
Mindfulness training has been studied extensively for attention and memory. The results are more modest than enthusiasts claim and more real than sceptics allow.
Spaced Repetition: The Best-Supported Learning Technique Most People Ignore
Testing yourself at increasing intervals produces substantially better retention than re-reading. The effect is large, replicated for over a century, and almost nobody uses it.
Napping and Memory: What a Short Sleep Does and Does Not Do
Daytime sleep has measurable effects on retention of material learned beforehand. Duration and timing determine whether a nap helps or costs you the following night.
Thyroid Function and Memory: A Routine Test Worth Asking About
Thyroid dysfunction can produce cognitive symptoms, is common, and is identified by a standard blood test. It is one of the simplest reversible causes to rule out.
Menopause and Brain Fog: What Research Says About Cognitive Change
Cognitive complaints during the menopausal transition are common and frequently dismissed. Research suggests the changes are real, measurable and, for most, temporary.
Phones, Attention and Memory: What Is Established and What Is Not
Claims about phones destroying memory outrun the evidence. The better-supported findings are narrower, and one of them is genuinely useful.
Insomnia and Memory: Why the First-Line Treatment Is Not a Sleeping Pill
Chronic insomnia has cognitive consequences, and the treatment with the strongest evidence is a structured behavioural programme rather than medication.
Multitasking and Memory: The Cost Happens at Encoding
Divided attention is probably the largest controllable cause of everyday forgetting. The memory failure you notice later was caused at the moment you were not paying attention.
Mild Cognitive Impairment: What the Diagnosis Means and What It Does Not
MCI describes cognitive change beyond what is expected for age, without significant impairment of daily function. It is not early dementia, and outcomes vary considerably.
Caffeine and Memory: Real Effects on Attention, Weaker Effects on Recall
Caffeine reliably improves alertness and sustained attention. Whether it improves memory itself is a narrower question with a more qualified answer.
Types of Dementia: Why the Distinction Matters
Dementia is an umbrella term, not a single disease. The main types differ in symptoms, progression and management — and misidentification can lead to harmful treatment decisions.
The Memory Palace: Why an Ancient Technique Still Outperforms Modern Ones
The method of loci is the oldest documented memory technique and remains the most effective for ordered material. It also has clear limits that its enthusiasts rarely mention.
Cognitive Reserve: Why Two Brains With the Same Damage Perform Differently
Autopsy studies found people with substantial Alzheimer's pathology who showed no symptoms in life. The concept developed to explain that gap has real implications.
B Vitamins and Memory: Deficiency Matters, Supplementation Usually Does Not
Vitamin B12 deficiency can cause serious and partly reversible cognitive symptoms. That is a very different claim from supplements improving memory in people who are not deficient.
Interleaving: Why Mixing Practice Feels Worse and Works Better
Practising one thing at a time until you have it feels efficient. Mixing topics produces worse performance during practice and better retention afterwards.
Dehydration and Thinking: A Small Effect That Is Easy to Fix
Mild dehydration has measurable effects on attention and mood in controlled studies. The effect is modest — but unlike most cognitive variables, it is trivially correctable.
Smoking and Cognition: The Risk, and What Happens When People Stop
Smoking is a recognised modifiable risk factor for cognitive decline. The more useful part of the evidence concerns what changes after quitting.
Do Brain Training Apps Work? What the Evidence Actually Shows
Commercial brain training makes people better at brain training. Whether that improvement transfers to anything else is the whole question — and the answer has been consistently disappointing.
Stress and Memory: Why You Blank Under Pressure
Acute stress and chronic stress affect memory in different directions. Understanding which one you are dealing with determines what actually helps.
How Memory Actually Works: Encoding, Storage and the Retrieval Problem
Memory is not a recording device. Understanding the three stages it moves through explains most of what people call “a bad memory” — and where it can realistically be improved.
Learning a Language Later in Life: Difficulty Is the Point
Language learning is among the more demanding things an adult can take up, which is precisely why it is discussed in relation to cognitive reserve.
Medications That Can Affect Memory: A Reason to Review, Not to Stop
Several widely used drug classes have recognised cognitive effects. Reviewing them with a prescriber is one of the more productive steps in a memory evaluation.
Vitamin D and Cognition: Deficiency Is Common, Supplementation Trials Are Disappointing
Low vitamin D has been associated with worse cognitive outcomes in observational research. Randomised trials of supplementation have largely failed to show cognitive benefit.
How to Remember Names: The Failure Is Usually Attention, Not Memory
Forgetting names is the most commonly reported memory complaint. The cause is rarely a memory problem, and the fix is less about technique than most advice suggests.
APOE4 and Genetic Testing: What a Result Can and Cannot Tell You
Direct-to-consumer tests now report APOE status. The result carries real information about population risk and very limited information about any individual's future.
False Memories: Why Confidence Is Not Evidence
People can recall events that never occurred, in detail, with complete conviction. The research on this has changed how courts treat eyewitness testimony — and it should change how you treat your own certainty.
When Depression Looks Like Dementia
Depression can produce memory and concentration problems severe enough to be mistaken for a neurodegenerative condition. It is also treatable, which makes distinguishing them important.
Building a Daily Routine That Supports Memory Without Taking Over Your Life
Pulling together what has actual evidence behind it into something sustainable — and dropping the things that only look productive.
Musical Training and the Brain: Separating the Findings From the Claims
Playing an instrument is among the most cognitively demanding recreational activities. The research is interesting, and it has been consistently overstated in popular accounts.
Alcohol and Memory: The Effects Are Larger Than Most People Assume
Alcohol disrupts memory formation directly and disrupts sleep-based consolidation indirectly. Both effects appear at doses well below intoxication.
Delirium Is a Medical Emergency and Is Often Mistaken for Dementia
Sudden confusion in an older adult is not normal ageing and is not dementia developing quickly. It usually indicates an acute medical problem requiring urgent attention.
Tip of the Tongue: What Happens When You Know You Know It
You can report the first letter, the number of syllables and the meaning — everything except the word. The state is well studied, and what it reveals about memory is reassuring.
Working Memory and Long-Term Memory Are Not the Same System
The mental workspace you use to hold a phone number is structurally different from the store that holds your childhood. Confusing them leads people to misdiagnose their own memory.
Why Physical Exercise Is the Most Reliable Thing You Can Do for Your Brain
Among all the interventions studied for cognitive health, aerobic exercise has some of the most consistent evidence — though the effect is more modest than headlines suggest.
Prospective Memory: The Kind of Forgetting That Actually Disrupts Life
Remembering to do something later is a different system from remembering the past — and it is where most consequential everyday failures happen.
Sleep Is When Memory Gets Built, Not Just Rested
Consolidation — the process that turns a fragile new trace into a durable memory — happens largely during sleep. That makes sleep the least optional part of memory.
How to Read a Health Study Before You Believe the Headline
Most misleading brain health claims are not fabricated. They are real studies, described in ways that outrun what they found. A few questions catch nearly all of it.
Sleep Apnoea and Memory: A Common, Treatable and Frequently Missed Cause
Untreated obstructive sleep apnoea is associated with measurable cognitive problems. It is also one of the more straightforwardly treatable contributors to memory complaints.
Blood Sugar, Diabetes and Memory: What the Evidence Shows
Type 2 diabetes is associated with higher rates of cognitive decline. The relationship is well documented, the mechanisms are partly understood, and the implications are practical.
Omega-3 and the Brain: A Careful Look at Mixed Evidence
DHA is a major structural component of brain tissue, which makes omega-3 supplementation sound obviously beneficial. Trial results have been considerably less clear.
Hearing Loss Is a Modifiable Risk Factor for Cognitive Decline
The association between untreated hearing loss and cognitive decline is one of the more striking findings in recent research — and one of the most actionable.
Ultra-Processed Food and Cognition: A Growing Literature With Real Limitations
Associations between ultra-processed food intake and cognitive outcomes have appeared in several large studies. The findings are worth knowing and the caveats are substantial.
The Mediterranean Diet and Cognitive Health: What the Evidence Supports
Dietary patterns have more support in cognitive research than individual nutrients do. Here is what the studies show, and the significant caveats that come with observational research.
Notes, Lists and External Memory: Offloading Is Not Cheating
The belief that relying on notes weakens memory has no good evidence behind it. What the research suggests is more useful and more specific.
Ginkgo and Other Herbal Memory Supplements: Reading the Evidence
Several herbal products are marketed for memory. The evidence ranges from unconvincing to absent, and some carry real interaction risks.
Head Injury and Memory: Immediate Effects and Long-Term Questions
Traumatic brain injury is a recognised risk factor for later cognitive problems. Prevention — particularly fall prevention in older adults — is the most actionable part.
Normal Forgetting and Warning Signs: How Clinicians Tell Them Apart
Forgetting a name is ordinary. Some patterns are not. Here is how the distinction is usually drawn — and why self-diagnosis in either direction is a mistake.