Memory Techniques That Actually Work: Chunking and the Memory Palace
Forgetting a name or a list is not a character flaw. Learn the two memory techniques with the strongest research behind them, and exactly how to use each one.
Most "memory tricks" sound like party gimmicks, but two of them have been studied for decades and hold up: chunking, which helps you hold more in mind right now, and the memory palace, which helps you store ordered lists for later. Neither needs special talent. Both need a few minutes of practice.
Chunking: why phone numbers have dashes
In 1956, psychologist George Miller published a famous paper arguing that short-term memory holds only a handful of separate items at once, roughly seven, though later researchers such as Cowan have argued the true number is closer to four once rehearsal tricks are ruled out. Miller's bigger point is less quoted but more useful: the limit applies to chunks, not to raw bits of information. A chunk is any familiar group you can treat as one unit.
This is why a phone number is split into groups like 98765-43210 instead of one long string of ten digits. Ten separate digits can overflow your short-term memory, but three or four grouped chunks fit comfortably. Miller even described an experiment where trained people correctly recalled strings of 40 binary digits, not by remembering 40 items, but by regrouping them into about eight meaningful chunks and remembering those instead.
How to use chunking today:
Group by threes or fours
Break any long number, code, or list into small clusters instead of reading it as one unstructured string.
Use meaning, not just size
A chunk built from something you already know, a date, a word, a pattern, holds more information than an arbitrary group of the same length.
Rehearse the groups, not the individual items
Say "nine-eight-seven, six-five-four" instead of "nine, eight, seven, six, five, four."
Build bigger chunks with practice
Experts in a field (chess, music, coding) can chunk far more into one unit than a beginner, because they already recognise the pattern.
The memory palace: an old trick with real brain evidence
The method of loci, often called a memory palace, is at least 2,000 years old: ancient Greek and Roman orators used it to deliver long speeches without notes. The idea is to imagine a place you know well, your home is the easiest, and mentally "place" each item you want to remember at a specific spot along a route through it, ideally with a vivid or unusual image. To recall the list, you walk the route in your mind and pick up each item where you left it.
A 2025 systematic review and meta-analysis in the British Journal of Psychology pooled decades of studies and found a large benefit for this technique on immediate serial recall (remembering an ordered list) compared with plain rehearsal, with young adults in the reviewed studies showing a clear advantage. Brain-imaging studies cited in the same review consistently show extra activity in the hippocampus and nearby regions linked to spatial memory while people use the technique, and short training programs have been shown to produce measurable structural changes in the brain.
How to build one, step by step:
Pick a familiar route
Your home, your commute, or your college campus, anywhere you can walk in your mind without getting lost.
Choose 5 to 10 fixed stops
The front door, the hallway mirror, the kitchen table, and so on, always in the same order.
Place one vivid image per stop
For each item you want to remember, picture it doing something strange, oversized, or funny at that spot. Odd images stick better than plain ones.
Keep it to about two items per stop
Cramming more than two items into one location makes retrieval messy; add more stops instead.
Walk the route to recall
Mentally retrace the same path in the same direction, and the images should surface where you left them.
Reuse the palace carefully
Reusing the same route for a new list can blur with the old one; clear the old images first or build a second palace.
What most people miss
- Chunking and the memory palace solve different problems. Chunking helps you hold more right now, in the middle of a task. The memory palace helps you store an ordered list for later, like a speech or a shopping list. Pick the tool for the job.
- Weird images beat neat ones. A memory palace works better when the mental picture is unusual or slightly absurd, plain, literal images are easy to forget.
- The palace needs upkeep. Skilled memory athletes do not use one palace forever; they build fresh ones for new material, because old images bleed into new ones over time.
- Neither trick replaces understanding. Both techniques are for holding on to information you already understand or specific facts and lists. They will not help you learn a concept you have not grasped; for that, methods like active recall and spaced repetition still do the real work.
Chunking and the memory palace are not magic, and they will not turn anyone into a savant. What they do is give you a deliberate structure for information that would otherwise slide out of a short-term memory that was never built to hold loose, unconnected facts.
