this post was submitted on 16 Jun 2026
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[–] mech@feddit.org 93 points 1 week ago* (last edited 1 week ago) (3 children)

No reliable record exists of Sidis ever taking a standardized IQ test. The frequently cited claim that he scored between 250–300 on an IQ test stems from a single, uncorroborated account by psychologist Abraham Sperling in his 1946 (2 years after Sidis' death) book Psychology for the Millions.

The concept of IQ as measured by modern tests did not exist during Sidis's childhood

Wikipedia

[–] lime@feddit.nu 44 points 1 week ago (4 children)

i mean, iq is a normal distribution. it caps at 200. 160 represents the 99.996th percentile, and above that the error bars are so large that the result is uneless.

[–] mech@feddit.org 54 points 1 week ago* (last edited 1 week ago) (3 children)

It's not capped, really. But the claimed 250 IQ would be 10 standard deviations from the mean, so he'd be the most intelligent person in a population of ~10^24^ people.
~10^11^ humans have ever lived on earth.

[–] bampop@lemmy.world 20 points 1 week ago (1 children)

The most likely explanation is that he was from outer space

Smells like von neumann

[–] Buddahriffic@lemmy.world 6 points 1 week ago

It's capped in practical terms by the highest score a test can be given. Unless getting a perfect just means you have another harder round.

[–] bort@sopuli.xyz 3 points 1 week ago (1 children)

so what you are saying is that it has a cap, which is based on the number of people he is compared against?

[–] Feathercrown@lemmy.world 5 points 1 week ago (1 children)

No, but without people to compare against, there is a limit to how high the scale can stay accurate. This is different from it actually having a cap, though.

[–] naught101@lemmy.world 1 points 1 week ago (1 children)

After 30 years on the internet, this might be the absolute nerdiest conversation I have ever seen. I'm impressed.

[–] Feathercrown@lemmy.world 2 points 1 week ago
[–] Telemachus93@slrpnk.net 13 points 1 week ago (1 children)

Strictly speaking, a normal distribution doesn't cap, neither at 0 nor at 200. Maybe the scores achievable by standardized tests do, of course.

[–] lime@feddit.nu 9 points 1 week ago

they usually cap at 150. but yeah it's not a hard cap, it's an asymptotic curve. statistically the chance of getting 201 or higher is the same as getting -1 or lower.

[–] NigelFrobisher@aussie.zone 3 points 1 week ago

That’s just how clever he was, silly.

[–] taiyang@lemmy.world 2 points 1 week ago

I was going to mention the same thing. Even the "smartest man alive" would be in those useless upper bounds.

To explain that upper bounds issue to others, imagine being the top score on a leaderboard. Some of that's going to be random chance and other factors, even if most of the time you score in the top 1% of scores consistently.

[–] IratePirate@feddit.org 8 points 1 week ago* (last edited 1 week ago)

Yuppp, this smelled like bullshit from miles away. Thanks for corroborating!

[–] Summzashi@lemmy.world 4 points 1 week ago

IQ is pseudo science nonsense anyway.