Chimp Test
The Chimp Test challenges your spatial working memory — the same cognitive skill tested in the famous 2007 Kyoto University experiment where a chimpanzee named Ayumu outperformed human students. Memorize the number positions, then click them in order once they vanish. How far can you go?
Chimp Test
Click the squares in ascending order.
What Is the Chimp Test? — The Science Behind the Challenge
The Chimp Test is a spatial working memory benchmark inspired by a landmark 2007 experiment at Kyoto University's Primate Research Institute. Researchers led by Dr. Tetsuro Matsuzawa discovered that a young chimpanzee named Ayumu could memorize the positions of numbers 1–9 on a touchscreen after just 65 milliseconds of exposure — vastly outperforming university student volunteers who struggled to recall even 3–4 positions.
In the digital version of this test, numbers appear briefly on a grid and then disappear, replaced by blank white squares. Your challenge is to click the squares in ascending numerical order, purely from memory. Each successful level increases the number count by one, making the task progressively harder.
The Cognitive Trade-Off Hypothesis (Dr. Matsuzawa, 2007):
Humans evolved advanced language and abstract reasoning by trading away the raw short-term eidetic spatial memory that chimpanzees retained for rapid tree navigation and predator detection. Our brains are better at storing meaning; chimp brains are better at storing locations at extreme speed.
How to Play the Chimp Test — Step-by-Step Guide
- 1
Open the Chimp Test
Navigate to cpsspeedtest.com/chimp-test in any browser. The test works on both desktop and mobile — no download or signup required.
- 2
Study the numbered squares
A grid of numbered squares (starting with numbers 1–4) appears on screen for a brief moment. Memorize the position of each number as quickly as you can.
- 3
The numbers disappear — white squares remain
After the display period, all numbers vanish and are replaced by blank white squares. Your task is to click the squares in ascending numerical order (1, 2, 3, 4...) from memory.
- 4
Click the squares in ascending order
Click where you remember seeing number 1 first, then 2, then 3, and so on. If you click incorrectly, the round fails.
- 5
Advance to harder levels
Successfully completing a level adds one more number to the sequence. Level 5 shows numbers 1–5, Level 6 shows 1–6, and so on. The display time also shortens at higher levels.
- 6
Track your personal best level
The game ends when you click a wrong square. Your highest completed level is your score. Most adults reach level 7–9. Ayumu the chimpanzee achieved level 9 in under 65 milliseconds of display time.
💡 Mental Tracing Trick: Before the numbers disappear, quickly trace an imaginary curved line from 1 → 2 → 3 → 4 → 5 in your mind. This converts 5 separate location memories into a single continuous path memory — much easier to hold.
Benefits of Testing & Training Working Memory
Working memory is not just a gaming skill — it underpins nearly every complex cognitive activity in daily life. Here is why training it matters:
Academic & Professional Performance
Working memory capacity strongly predicts reading comprehension, mathematical problem solving, and the ability to follow multi-step instructions. Students with stronger working memory perform measurably better in standardized academic tests across all subjects.
Gaming & Esports Performance
In fast-paced games, working memory determines how many enemy positions, teammate locations, and tactical variables you can simultaneously track. Higher working memory capacity lets you play more 'chess moves ahead' in any strategy or multiplayer game.
Cognitive Health & Aging
Working memory capacity naturally declines with age, but cognitive exercises that challenge spatial and sequential memory have been shown to slow this decline. Regular memory training maintains neural plasticity and supports long-term brain health.
Everyday Decision Making
Remembering directions while navigating, keeping track of a conversation while formulating your response, mentally calculating change at a checkout — all rely on working memory. Even modest improvements to working memory capacity yield noticeable daily life benefits.
The Ayumu Experiment — Full Scientific Deep Dive
In 2007, researchers at Kyoto University's Primate Research Institute set up a head-to-head working memory competition between human university students and Ayumu — a 5-year-old male chimpanzee born and raised in the lab.
Nine numbers (1–9) appeared on a touchscreen for exposures ranging from 650 milliseconds down to 65 milliseconds. After the numbers vanished, both human and chimp had to touch the blank squares in ascending order. The results:
| Exposure Duration | Ayumu (Chimp) Accuracy | Human Students Accuracy |
|---|---|---|
| 650 ms (long) | ~90% | ~80% |
| 430 ms (medium) | ~90% | ~60% |
| 210 ms (short) | ~80% | ~40% |
| 65 ms (extreme) | ~80% | ~20% |
The study, published in Current Biology (Inoue & Matsuzawa, 2007), sparked worldwide discussion about evolutionary cognition and the nature of human uniqueness. It revealed that humans' cognitive supremacy is not universal — it comes with specific biological trade-offs.
Chimp Test Score Benchmarks — What Is a Good Score?
Normal for adults tested without prior training. Matches lower end of Miller's Law (7±2).
Core working memory capacity range. Matches the average chimpanzee performance window.
Above-average spatial recall. Typically achieved with mental tracing or chunking strategies.
The chimpanzee benchmark. At full human display speed, this level is achievable with practice.
How to Improve Your Chimp Test Score — 5 Strategies
Mental tracing — connect numbers into a path
Before numbers vanish, quickly trace an imaginary line connecting 1 → 2 → 3 → 4 in sequence. Remembering one continuous path is cognitively easier than remembering 4 separate locations.
Peripheral vision scanning — see all at once
Instead of reading numbers left-to-right (which misses peripheral numbers), fix your gaze at the center of the grid and absorb all positions simultaneously. Peripheral vision processes spatial location faster than sequential scanning.
Geometric clustering — group into shapes
If numbers form a triangle or L-shape, remember the shape instead of individual positions. Your spatial memory handles geometric forms more efficiently than arbitrary point lists.
Practice daily in 5–10 minute sessions
Working memory responds to deliberate practice, but fatigues quickly. Short daily sessions (5–10 minutes) outperform long infrequent ones for sustained improvement.
Combine with other memory tests
Cross-training with Number Memory (forward digit span), Visual Memory (grid patterns), and Sequence Memory (Simon Says) engages different working memory sub-systems and accelerates overall improvement.
Frequently Asked Questions — Chimp Test
What is the Chimp Test and where did it originate?
The Chimp Test is a spatial working memory challenge based on a landmark 2007 study at Kyoto University's Primate Research Institute led by primatologist Dr. Tetsuro Matsuzawa. In the study, a young chimpanzee named Ayumu could see numbers 1–9 scattered on a touchscreen for just 65 milliseconds and recall their exact sequential positions with 80–90% accuracy — vastly outperforming university students. The digital version replicates this test to benchmark human spatial short-term memory.
Why do chimpanzees outperform humans in this working memory test?
According to Dr. Matsuzawa's 'Cognitive Trade-Off Hypothesis', humans evolved complex language, symbolic reasoning, and long-term semantic memory by sacrificing the brain's raw short-term eidetic (photographic) spatial memory capacity. Chimpanzees, lacking complex language, retained this rapid spatial snapshot ability as an evolutionary advantage for navigating tree canopies and detecting predators at speed. Humans traded photographic spatial memory for abstract thinking.
What is a good score on the Chimp Test?
Most adults successfully complete up to level 7–9, which aligns with George Miller's famous 1956 psychological paper establishing short-term memory capacity as '7 ± 2 items' (known as Miller's Law). Reaching level 10 or above requires advanced spatial chunking and visualization strategies. Scores above 12 are exceptional and are typically achieved through dedicated memory training rather than innate ability.
What is working memory and why does it matter?
Working memory is the cognitive system that temporarily holds and manipulates information during active tasks — it is your brain's mental scratchpad. It determines how many items you can track simultaneously, how well you follow multi-step instructions, and how quickly you can process complex situations. Strong working memory is associated with higher academic performance, faster learning, better decision-making, and improved performance in fast-paced games.
Can I improve my score on the Chimp Test with practice?
Yes. Specific strategies that help include: visualizing a continuous line connecting numbers 1 through N before they disappear (the 'mental tracing' technique), grouping numbers into geometric clusters (triangle, square), maintaining a relaxed wide-field focus rather than scanning one number at a time (peripheral vision is faster for spatial location recall), and regular practice with sequential memory tasks.
How does the Chimp Test differ from other memory tests on this site?
The Chimp Test specifically measures spatial working memory — your ability to recall where things were located, not what they were. The Number Memory Test measures forward digit span (how many sequential digits you can repeat). The Visual Memory Test measures grid pattern recall. The Sequence Memory Test measures auditory or visual pattern sequence recall. Each targets a different dimension of working memory.
Does poor performance on the Chimp Test indicate low intelligence?
No. The Chimp Test specifically measures one narrow dimension of cognitive function: short-term spatial eidetic recall. It is not an IQ test, and a low score does not reflect general intelligence. Humans' relative weakness in this specific task is a normal evolutionary trade-off. Many highly intelligent people score lower than average on spatial working memory tests while excelling in verbal reasoning, analytical thinking, and creative problem-solving.
Related Memory & Cognitive Tests
Number Memory Test
Test forward digit span — how many numbers can you hold in sequence?
Sequence Memory Test
Simon-pattern sequential memory challenge.
Visual Memory Test
Spatial grid pattern memorization test.
Verbal Memory Test
Word recognition and verbal recall benchmark.
Reaction Time Test
Measure your visual reflex speed alongside memory.
Stroop Test
Test cognitive interference and processing speed.