Memory champions don't have special brains — they have special methods. Ancient spatial encoding techniques that turn abstract information into vivid mental journeys anyone can take.
Every few years, a story circulates about a person who can memorize hundreds of digits of pi, or recall the complete sequence of a shuffled deck of cards in under a minute, or recite names and faces from a room full of strangers met once, briefly, three weeks ago. The assumption most people bring to these stories is the same: this person must have been born different. Some neural gift they didn't earn and most of us weren't given.
The assumption is wrong. Methodically, rigorously, scientifically wrong.
In 2017, a team led by neuroscientist Martin Dresler at Radboud University published a landmark study in the journal Neuron. They took 23 of the world's top-ranked memory champions and 23 ordinary people with comparable baseline memory performance. They scanned both groups' brains. They found no structural differences — no unusual hippocampal size, no atypical white matter connectivity, no neurological gifts. What they found instead was that the memory champions used a specific cognitive strategy, visibly different from the rote repetition that the untrained group relied on. And when they trained the untrained group in that strategy for just six weeks, those people's memory performance improved by 138%.
That strategy is over 2,500 years old. The ancient Greeks called it the Method of Loci. Today's competitors call it the memory palace. And in this episode, we're going to pull it apart — the mechanics, the neuroscience, the historical record, the modern competitive scene, and the very practical question of what any of us can actually do with it starting today.
Memory competition involves several distinct events — memorizing decks of cards, long sequences of binary digits, faces paired with names, spoken words, historic dates. Different events favor slightly different techniques, but all of them share the same cognitive architecture: encode abstract information as vivid, spatial, emotionally engaging narrative imagery, then retrieve that imagery by navigating a familiar mental route.
Place vivid images at specific locations along a familiar mental route. Retrieve by mentally walking the route and "seeing" the images. The oldest documented mnemonic technique, attributed to the Greek poet Simonides around 477 BCE.
An extended application of the Method of Loci using a rich, multi-room mental environment rather than a single route. Advanced practitioners build hundreds of palaces over years, each reserved for different domains of knowledge.
A phonetic code that converts digits into consonant sounds, allowing numbers to become words and then memorable images. Foundation of most competitive digit-memorization strategies worldwide.
Assigns a specific person, their characteristic action, and an associated object to each of 100 (or 1,000) number pairs. Allows three numbers to be encoded as a single vivid scene — compressing information density dramatically.
Creates a narrative chain where each item to be remembered connects to the next through an absurd, vivid story. Works well for ordered lists of moderate length. Less stable than the palace for very long sequences but easier to learn initially.
Not a palace technique, but the scientifically optimal method for deciding when to review information. Reviewing just before forgetting — intervals that grow exponentially — builds long-term retention far more efficiently than massed practice.
The technique works best when you stop thinking of it as a metaphor and start treating it as literal spatial experience. Your brain's hippocampus evolved primarily for navigation — for encoding "I went left at the large oak, then uphill past the spring." When you consciously engage this system for other kinds of memory, you're recruiting one of the most powerful storage mechanisms evolution has produced.
Here is a concrete example. Suppose you need to memorize the first six planets in order of distance from the sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn. Instead of repeating the list, walk through your own front door and proceed through your home, placing an image at each familiar location.
Mercury the element, glass shattering, silver liquid spreading across your welcome mat. The more vividly unpleasant or absurd, the better it will stick.
The carnivorous plant, enormous and aggressive, lined up along the hallway walls. You have to dodge around its snapping mouths to reach the next room.
The familiar place becomes unfamiliar through this intrusion of nature. You can feel the damp grass under your hand. Earth — home.
The Mars bar works double duty: the red color, the brand name, the smell and mess. Engage multiple senses whenever possible — the more sensory channels involved, the more retrieval cues the brain stores.
Jupiter the Roman king of gods, enormous, filling the bathroom from floor to ceiling, casually leaning against the mirror. His size makes the room feel impossibly small.
Saturn's rings, scaled up and blazing, surrounding the headboard. The gold-and-copper glow illuminates the ceiling. When you mentally walk into this room, the rings are unmistakable.
Test it right now: without looking back, can you remember the six planets? Walk through your own front door mentally, move through the rooms, and see what's waiting at each location. Most people who genuinely visualize rather than just read this list can retrieve all six on the first attempt — not because they've memorized them through repetition, but because they've encoded spatial, sensory, narrative images that the hippocampus stores with extraordinary fidelity.
Numbers are one of the hardest things for most people to remember, because they carry no inherent meaning. The digit 7 has no smell, no emotional valence, no story attached to it. The Major System solves this by assigning each digit a consonant sound and then allowing you to construct words — which can then be placed in a palace or linked into narrative.
| Digit | Consonant Sounds | Memory Hint | Example Word |
|---|---|---|---|
| 0 | s, z | Zero starts with z; s and z share a similar hiss | SaW, ZeRo |
| 1 | t, d | t has one downstroke; d is its voiced pair | TaR, DoVe |
| 2 | n | n has two downstrokes | NoSe, NaP |
| 3 | m | m has three downstrokes; 3 resembles sideways m | MaP, MooN |
| 4 | r | fouR ends in r | RaG, RoW |
| 5 | l | L is the Roman numeral for 50; spread hand shows 5 fingers, thumb and index finger form L | LaW, LoaF |
| 6 | j, sh, ch, soft-g | 6 and J share a curved top when mirrored | SHoe, CHain |
| 7 | k, hard-c, hard-g, q | K is formed by two 7-like strokes; G is mirrored 7 | CaKe, GoaT |
| 8 | f, v | handwritten f has two loops like 8; v is voiced f | FoG, VaT |
| 9 | p, b | 9 and P mirror each other; b is p rotated | PaGe, BaLl |
In the Major System, vowels (a, e, i, o, u) and the letters h, w, y are "silent" — they don't encode any digit. This means you can choose freely among vowel combinations to create a memorable word from any consonant skeleton. The number 42, for instance, gives you consonants r (4) and n (2) — RAIN, RUIN, RUNNY, RHINO, ARENA (r + n). You pick whichever word produces the most vivid image.
For a two-digit number like 73, you get k/g (7) and m (3) — GAME, GUMMY, COMB, CAMERA (k + m with intervening vowels). The word CAMERA is excellent: vivid, concrete, imaginable, and uniquely associated with 73 in your personal system once you commit to it.
Advanced practitioners build a complete 100-word or even 1,000-word system — one memorable image for every number from 00 to 99, or from 000 to 999. Combined with a memory palace, this allows them to encode long digit sequences at speed, placing one pre-memorized image per palace location rather than constructing new imagery on the fly.
The Person-Action-Object (PAO) system takes the Major System further. For each two-digit pair from 00 to 99, a practitioner assigns three things: a Person associated with that number, an Action they characteristically perform, and an Object they're associated with. When memorizing a long sequence, you group the digits in clusters of six (three two-digit pairs), and each group becomes a single vivid scene: the Person from the first pair, doing the Action of the second pair, with the Object of the third pair.
Three six-digit clusters become three scenes. Three scenes encode 18 digits. The scenes live at three consecutive locations in a palace.
The PAO system is the dominant technique in competitive card memorization, where a deck of 52 cards must be memorized in sequence. Each card is pre-assigned a Person, Action, and Object; each trio of cards becomes one scene; the 18 resulting scenes are placed in a palace of 18 locations. With a practiced system and a well-known palace, world-class competitors can accomplish this in under 20 seconds.
The Dresler study's brain imaging results are particularly illuminating. When untrained participants performed rote memorization, their brain activity was concentrated in frontal and parietal regions associated with working memory and effortful attention. When trained participants used the Method of Loci, the activity pattern shifted: the hippocampus (central to spatial and episodic memory) became substantially more active, as did visual cortex regions associated with vivid mental imagery.
This shift reflects the fundamental insight behind the technique. The human hippocampus evolved over millions of years to encode spatial and episodic information with extraordinary fidelity — where food was found, where danger was encountered, what happened on a specific journey through a specific landscape. When memory champions use the Method of Loci, they're essentially telling the hippocampus: "This is a journey. These are things I encountered on this journey." The hippocampus, doing what it evolved to do, encodes the information robustly.
Rote repetition, by contrast, asks a part of the brain that did not evolve for abstract symbol storage to do exactly that. The frontal working-memory system is powerful but has limited capacity and high decay rates. It's the wrong tool for the job.
The Method of Loci has perhaps the best-documented origin story of any cognitive technique. The Roman author Cicero, writing in De Oratore (55 BCE), describes it as an invention of the Greek poet Simonides of Ceos. The account, probably legendary but irresistible, goes like this:
Whether or not Simonides actually invented the technique, the story captures the insight precisely: spatial position is the organizing principle; sequential order through space becomes sequential order in memory. This principle underlies every memory palace ever built since.
The technique was systematized in the anonymous Roman rhetorical handbook Rhetorica ad Herennium (circa 85 BCE), the earliest surviving complete treatment of the Method of Loci. The handbook's advice — that images should be striking, bizarre, emotionally charged, or sexually provocative — reflects the same understanding of affective encoding that modern neuroscience confirms: emotionally vivid material is encoded more durably than neutral material.
The medieval Catholic Church adopted the technique for clerical training. Priests memorized sermons using spatial journeys through cathedral architecture — the physical building becoming a literal memory palace. Thomas Aquinas reportedly used the technique for his enormous memorized knowledge base. The Renaissance author Giulio Camillo went so far as to build a physical "memory theatre" — a circular wooden structure intended to represent the entire ordering of knowledge as a spatial journey.
The technique survived into the modern era through the competitive memory world, which began organizing formally with the first World Memory Championship in 1991. This yearly competition, which includes events in card memorization, digit memorization, abstract image memorization, and spoken word recall, has elevated the technique from historical curiosity to active athletic practice.
Memory techniques weren't developed for puzzle-solving, but the overlap between memory training and puzzle-solving performance is substantial. Here is where the skills translate most directly.
Crosswords repeatedly surface the same unusual words — ESNE, ORLE, ETUI, ALOE, ERNE. Instead of encountering these again and again and half-remembering them, encode each with a vivid image and a Major System hook. ESNE (a medieval serf) becomes easier to remember if you link it to a specific scene in a palace location you revisit when practicing vocabulary.
Quiz puzzle veterans encode trivia deliberately rather than passively. A date (1815 — Battle of Waterloo) becomes "TaFt LiVeS" via Major System (1=t, 8=f, 1=t, 5=l — TAFTL, with added vowels). Placing Taft next to Wellington in a palace creates a retrieval cue that survives far longer than repeated reading of the date.
For puzzles that require tracking many simultaneous constraints — logic grids, nonograms, constraint satisfaction — the ability to deliberately place information in a mental spatial structure frees up working memory for active reasoning rather than passive maintenance. Experienced solvers treat their spatial memory as a scratchpad.
Building memory palaces exercises exactly the kind of associative, metaphorical, cross-domain thinking that underlies good lateral thinking in puzzles. The habit of asking "what does this remind me of?" — the core question of memory encoding — is also the core question of creative problem-solving in puzzles of all kinds.
The barrier to entry is lower than most people expect. You already own the most important raw material: a familiar place you can navigate mentally without effort. The rest is practice.
Pick a place you know extremely well — your childhood home, your current apartment, a route you walk regularly. The key is that you can navigate it in your mind without effort, visiting every location in a predictable sequence.
Walk through the space mentally and identify 10 discrete, unambiguous positions: front step, doorway, coat rack, hallway mirror, kitchen table, sink, refrigerator, back door, first stair, landing. Number them consistently. These are your loci — your "places."
For each item you want to remember, create an image that is bizarre, oversized, moving, emotionally engaging, or sensory-rich. Place it at the next location in your sequence. The more outlandish, the better — the brain preferentially encodes what is unusual.
To recall, mentally walk through the palace from beginning to end. Pause at each location and notice what's there. The image, if placed vividly enough, will still be waiting. Retrieve the information it represents.
The landmark peer-reviewed study demonstrating that six weeks of Method of Loci training improves memory performance by 138% and shifts brain activation patterns toward hippocampal/visual systems.
The largest online community for memory technique practitioners, with forums, training guides, the Major System wiki, and discussion of competitive events.
Official site for the annual World Memory Championships — event categories, rankings, competition rules, and historical results going back to the first championship in 1991.
The oldest surviving complete treatment of the Method of Loci, with the earliest systematic advice on image construction and palace design. Digitized from Latin with commentary.