The science of brain training
Blog
Deep dives into working memory, reaction time, cognitive flexibility, and the psychology behind every game — written for curious minds, not academics.
How Colour Memory Works: The Science of Visual Short-Term Memory
Your brain can hold just a handful of colours at once. Here's what that limit reveals about working memory — and how training can push it.
Miller's Law: Why You Can Only Remember 7 (±2) Digits
In 1956 psychologist George Miller discovered that humans hold about 7 chunks in working memory. Sixty years of research has refined that number — and revealed how to stretch it.
Visuospatial Working Memory: The Mental Sketchpad Behind Pattern Recall
Baddeley's visuospatial sketchpad holds the spatial maps, mental images, and sequences your brain needs to navigate and plan. Here's how to train it.
Visual Memory Capacity: How Many Cells Can Your Brain Hold?
Your visual memory doesn't take a photograph — it compresses. Here's what research reveals about capacity, precision, and how practice changes both.
Dual N-Back: The Most Researched Brain Training Task — What the Science Actually Says
Dual N-Back sparked a decade of debate about whether brain training transfers to real-world intelligence. Here's what the research actually found.
How to Improve Working Memory: 7 Science-Backed Strategies
Working memory is the mental workspace that drives reading, reasoning, and decision-making. These seven strategies are supported by peer-reviewed research.
Does Brain Training Actually Work? What the Science Says
The brain training industry is worth billions. Independent researchers are far less impressed. Here's an honest look at what works, what doesn't, and why.
Cognitive Decline by Age: What's Normal and What's Not
Not all cognitive change is decline, and not all decline is equal. Here's what neuroscience says about how different mental abilities change across a lifetime.
Brain Training Exercises for Adults: What Actually Works
Not all brain exercises are equal. These five categories of training have the strongest evidence for maintaining and improving cognitive performance in adults.
Short-Term Memory vs Working Memory: What's the Difference and Why It Matters
Most people use 'short-term memory' and 'working memory' interchangeably. Cognitive science treats them as distinct systems. Understanding the difference explains a lot about why some memory tasks are harder than others.
Is Sudoku Good for Your Brain? What the Research Actually Shows
Millions of people solve Sudoku daily believing it fights cognitive decline. The evidence is more nuanced — and more interesting — than the headlines suggest.
Nonograms (Picross): The Deductive Puzzle That Needs Zero Guessing
Nonograms are solvable by pure logic — no guessing required. Here's the constraint-satisfaction mathematics behind them and how they train systematic thinking.
The Card Game Set: Pattern Recognition at the Speed of Thought
Set is a real-time pattern-recognition game with deep combinatorial mathematics. Here's why finding a Set is harder than it looks — and what playing it does to your brain.
Logic Grid Puzzles and the Art of Deductive Reasoning
Einstein allegedly claimed only 2% of people could solve his famous zebra puzzle. Whether that's true or not, logic grid puzzles build rigorous deductive thinking anyone can learn.
Sequence Completion and Inductive Reasoning: The Core of Abstract Intelligence
Completing number and pattern sequences is a cornerstone of IQ testing. Here's the cognitive science behind inductive reasoning and why it predicts so much.
Lights Out: The Puzzle With a Mathematical Solution Most Players Never Find
The Lights Out puzzle has a complete mathematical solution using linear algebra. Here's the hidden structure — and what it teaches about systematic problem-solving.
Fluid Intelligence: What It Is, How It's Measured, and Whether You Can Improve It
Fluid intelligence is the ability to solve novel problems through pure reasoning. It's the most contested component of intelligence research — and more trainable than once believed.
Executive Function: What It Is, Why It Matters, and How Games Train It
Executive function is the brain's control system — planning, inhibition, mental flexibility, and working memory. Here's the science behind it and which games target each component most directly.
Free IQ Test Online: What These Tests Actually Measure (And What They Don't)
Free online IQ tests vary wildly in quality. Here's what the best ones actually measure, how fluid intelligence differs from acquired knowledge, and which cognitive tasks come closest to what a real IQ test assesses.
Sliding Puzzles and the Brain: How Arrow Out Trains Spatial Planning
Sliding and sequencing puzzles like Arrow Out demand more than logic — they require you to mentally simulate future board states before touching a single piece. Here's the cognitive science behind why that's so demanding.
The Science of Deductive Reasoning: How Thinking Like a Detective Sharpens Your Mind
Murder mystery puzzles are more than entertainment — they're precision workouts for the brain's highest-order reasoning systems. Here's the cognitive science behind detective thinking.
The Stroop Effect: Why Reading Beats Colour Recognition Every Time
John Ridley Stroop published his famous experiment in 1935. Ninety years later it remains one of psychology's most replicated findings. Here's why the interference happens and what it reveals about how attention works.
Mental Arithmetic: How Calculation Speed Reflects Brain Processing Power
Mental arithmetic is not just a school skill — it's a window into processing speed, working memory, and the efficiency of numerical cognition. Here's the science.
The Trail Making Test: How Neuropsychologists Measure Executive Function
The Trail Making Test has been used in clinical neuropsychology since 1944. Here's what the two parts measure, why the difference between them matters, and how to improve your score.
Word Scrambles and Lexical Retrieval: How Fast Can Your Brain Find Words?
Unscrambling words reveals how your mental lexicon is organised and how rapidly it can be searched. Here's the linguistics and neuroscience behind the task.
Change Blindness: Why Your Eyes See More Than Your Brain Processes
The gorilla study made change blindness famous. But the phenomenon reveals something deeper about how visual attention works — and its real-world consequences.
Attention Span: Separating Myth from Neuroscience
The '8-second goldfish' claim is false — and it's been misrepresenting human attention for a decade. Here's what the science actually says.
How to Improve Concentration: 8 Strategies That Actually Work
Concentration is a trainable skill, not a fixed trait. These eight evidence-backed strategies address the environmental, physiological, and cognitive roots of poor focus.
Cognitive Flexibility: What It Is, Why It Matters, and How to Train It
Cognitive flexibility is the ability to switch between mental frameworks without getting stuck. It underlies creativity, learning, and effective decision-making under changing conditions.
Spatial Intelligence: What It Is, How It's Tested, and Why It Predicts STEM Success
Spatial intelligence — the ability to mentally manipulate shapes, navigate environments, and reason about 3D objects — is one of the strongest predictors of success in engineering, surgery, and the physical sciences. Here's how it works and how to test yours.
Reaction Time: What's Normal, What's Elite, and What Actually Improves It
The average human reaction time is 200–250 ms. Elite athletes, surgeons, and fighter pilots consistently beat it. Here's what separates them — and how training helps.
Mental Rotation: The Visuospatial Skill Linked to STEM Success
In 1971, Shepard and Metzler showed that the brain rotates 3D objects in real time. The speed of that rotation predicts engineering ability, surgical skill, and more.
What Is a Normal Reaction Time? A Complete Guide by Age
Reaction time peaks in your late teens and slows gradually from your mid-20s. Here's exactly what's normal at every age — and what you can do about it.
Processing Speed: What It Is, How It's Tested, and How to Improve It
Processing speed is how quickly your brain executes basic cognitive operations. It declines with age but is one of the most trainable cognitive abilities.
Online Brain Tests: What They Actually Measure and How to Read Your Results
Online brain tests range from scientifically validated assessments to viral quizzes with no psychometric basis. Here's how to tell the difference, what the reliable tests actually measure, and what your scores mean.