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Your brain finds it easy to size up four objects but not five — here’s why (www.nature.com)

submitted 2 years ago by [email protected] to c/[email protected]

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An experiment found that the brain uses one set of neural circuits to identify the numbers 1–4; these circuits are very specific to their own numbers. A separate set of circuits respond to the numbers 5–9; these are less precise, and are activated by adjacent numbers.

For this reason, it is easier to determine when there are four things than to determine there are five things.

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[–] [email protected] 9 points 2 years ago* (last edited 2 years ago) (1 children)

This has been part of IQ tests for a while: the vast majority of people can hold to 4 items without a problem, some people struggle with that, some people can hold to 5, 6, 7 or rarely more objects without a problem.

It's also why phone numbers in most places started as 5 digit numbers, then as "area code + 7", and now that we use smartphone contact lists to save them, they've gone to full "country code + 9 + extension". There was also an interesting movement opposing the changes: https://www.mentalfloss.com/article/61116/why-did-old-phone-numbers-start-letters

[–] [email protected] 5 points 2 years ago

I bet this is also why old-timey phone numbers encoded the first digits with letters. The US had the famous ABC2/DEF3/... system that's still displayed on most keypads, and the former Soviet Union mapped the first letters of the Russian alphabet (skipping З to avoid confusion with 3)...

[–] [email protected] 1 points 2 years ago* (last edited 2 years ago)

This is cool. I always wondered why I can instantly grasp 1 through 4, but 5 and up become abstract. Thank you for posting this!