About the chimp test
The chimp test measures visuospatial working memory: how many items you can hold in mind, and where, after they vanish. Numbered tiles flash on a grid, then turn blank, and you must click them in ascending order from memory. Each level adds one more number, so the test climbs until you make a mistake. It is a clean, fast probe of a very specific mental skill rather than a general IQ measure.
The name comes from a striking experiment at Kyoto University's Primate Research Institute. A young chimpanzee called Ayumu, trained by Tetsuro Matsuzawa, can glimpse a scatter of numerals for a fraction of a second and then tap them in order almost flawlessly, outperforming most adult humans on the same task. The leading explanation is "eidetic" or photographic-style short-term memory, a capacity researchers believe young chimps retain and humans largely trade away for language. This test recreates that challenge in your browser; nothing you do is uploaded.
The headline result was published by Sana Inoue and Tetsuro Matsuzawa in Current Biology in 2007. In their task, five numerals appeared for as little as 210 milliseconds, barely longer than a single eye fixation, before being masked by white squares; Ayumu still recalled their order with about 80 percent accuracy, beating the university students tested alongside him. The finding fuelled the "cognitive trade-off hypothesis", the idea that during human evolution our lineage sacrificed some of this rapid photographic memory in exchange for the symbolic and linguistic abilities that define our species. The debate is not settled, but the demonstration remains one of the most famous results in comparative cognition.
How it works
Performance is driven by chunking and exposure time, not raw "brain speed". The number of tiles you can reliably reproduce is your memory span for this task, and it tracks the classic limits psychologists have measured for short-term memory.
level N = N numbered tiles to reproduce in order typical human span = 4 to 9 items (Miller's "7 plus or minus 2", 1956) score = highest level cleared before running out of lives shorter flash -> forces holistic capture instead of one-by-one reading
- Span limit: most adults plateau between levels 4 and 9; clearing past 10 is genuinely rare.
- Chunking helps: grouping nearby tiles into a remembered shape beats memorising isolated points.
- Exposure matters: the briefer the flash, the more you must rely on whole-grid capture, which is exactly Ayumu's edge.
Worked example
Suppose you reach level 8, see the eight tiles for about half a second, and then they hide.
- Tiles to recall: 8 positions, each tagged 1 to 8.
- Strategy: mentally group them, for example "top-left pair, then the diagonal of three, then the bottom cluster".
- Reproduce in order: click 1, 2, 3, and so on; one wrong click costs a life (three total).
- Outcome: clear all eight and you advance to level 9; miss one and you fall back a life but keep your best level as the score.
If you want to climb higher, train two habits. First, take in the whole grid with a single soft gaze rather than reading tiles one by one, the technique that gives Ayumu his edge. Second, chunk positions into shapes (an L, a triangle, a row) so that several tiles become one remembered unit, which sidesteps the 7-item bottleneck. Gains come quickly at first and then flatten, and they rarely carry over to unrelated memory tasks, so treat a rising score as mastery of this game rather than proof of a sharper everyday memory.
Score interpretation
| Highest level cleared | Band | What it means |
|---|---|---|
| 4 or below | Below average | Distraction or rushing; usually improves quickly with practice |
| 5 to 6 | Average | Squarely within the typical human memory span |
| 7 to 8 | Above average | At the upper edge of the classic 7 plus or minus 2 limit |
| 9 to 10 | Strong | Effective chunking and fast whole-grid capture |
| 11 or more | Exceptional | Rare; approaches the kind of feat Ayumu performs |
Common pitfalls
- Reading tiles one at a time. Trying to verbalise "1 is here, 2 is there" is slow and burns your exposure window. Capture the whole grid as a shape instead.
- Ignoring chunking. Memorising 8 isolated dots is near impossible; grouping them into 2 or 3 clusters fits comfortably inside your span.
- Panicking after one slip. You have three lives. A single misclick is recoverable, so do not let it rush the next level.
- Treating it as an IQ score. The chimp test measures one narrow skill, visuospatial short-term memory, not general intelligence or overall cognitive ability.
- Expecting transfer. Practice reliably raises your score on this task, but evidence that it improves unrelated everyday memory is weak. You mostly get better at the test itself.
- Cramming long sessions. Fatigue shrinks memory span. Short, focused attempts beat marathon sessions for both score and skill-building.
Related tools
Frequently asked questions
What does the chimp test measure?
It measures visuospatial working memory: how many positioned items you can hold in mind and reproduce after they disappear. It is a narrow, specific skill, not a measure of general intelligence or IQ.
Why is it called the chimp test?
It is named after Ayumu, a chimpanzee at Kyoto University trained by Tetsuro Matsuzawa, who can memorise the positions of numbers shown for a split second and tap them in order faster and more accurately than most adult humans.
What is a good score?
Most adults clear around level 5 or 6, which sits inside the classic short-term memory span of 7 plus or minus 2 items. Reaching level 8 is above average, and clearing 11 or more is exceptional and genuinely rare.
Can I get better with practice?
Yes, your score on this task improves with practice, mainly through better chunking and learning to capture the whole grid at once. However, evidence that the gains transfer to unrelated everyday memory tasks is weak; you mostly get better at the test itself.
Do chimps really beat humans at this?
On this exact rapid-recall task, young chimps like Ayumu do outperform most humans, which researchers attribute to a photographic-style short-term memory. It does not mean chimps are smarter overall; humans appear to trade some of that capacity for language and abstract reasoning.