What is the Chimp Test?
The Chimp Test is a working memory task based on famous research by cognitive scientist Tetsuro Matsuzawa at Kyoto University. It became widely known after a 2007 study showed that young chimpanzees outperformed adult humans at rapidly-displayed number sequences.
The original chimpanzee studied was named Ayumu. When numbers 1–9 were flashed on screen for fractions of a second and then masked, Ayumu could recall their positions perfectly — consistently outscoring humans who typically struggled beyond 4–5 numbers. The test exploits eidetic (photographic) short-term memory, which chimps appear to possess more strongly than adult humans.
Take the Human Benchmark Chimp Test to experience it yourself. The numbers flash briefly and then are replaced by blank squares. You must click them in ascending order from memory. Most humans max out around 8–9 numbers — roughly what Ayumu scored as a baseline before training.
Why do chimps beat humans? One leading hypothesis is that humans traded raw visuospatial short-term memory capacity for enhanced language processing during evolution. Our prefrontal cortex is enlarged for abstract thought, planning, and language — at some cost to eidetic visual recall.
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Quick Answer
The Chimp Test is based on research by Tetsuro Matsuzawa showing that chimpanzees outperform humans at briefly-displayed number sequences. It tests visuospatial working memory.
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