History Main / NinetyPercentofYourBrain

10th Dec '17 6:48:40 PM gophergiggles
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This trope name comes from the oft-repeated but false assertion that humans only use 10 percent of their brains. In RealLife, we use ''all'' of our brains, just not all at the same time -- in much the same way you don't have every electronic/mechanical item in your home running at all times; you only turn things on when you need to use them. If you ever do find yourself with every part of your brain "on" at once, congratulations, ''you're having a seizure!'' [[note]]More precisely, seizures occur because parts of the brain start firing off randomly. In some general seizures, the entire brain can have neuronal activity at once for brief moments.[[/note]]

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This trope name comes from the oft-repeated but false assertion that humans only use 10 percent of their brains.brains, a misquote of ''How To Win Friends And Influence People''[[note]]"The average person develops only 10 percent of his latent mental ability"[[/note]]. In RealLife, we use ''all'' of our brains, just not all at the same time -- in much the same way you don't have every electronic/mechanical item in your home running at all times; you only turn things on when you need to use them. If you ever do find yourself with every part of your brain "on" at once, congratulations, ''you're having a seizure!'' [[note]]More precisely, seizures occur because parts of the brain start firing off randomly. In some general seizures, the entire brain can have neuronal activity at once for brief moments.[[/note]]
2nd Dec '17 10:06:46 AM SparkPlugTheTroper
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* Parodied in ''WesternAnimation/LesShadoks''. The Shadoks use their brain plenty, but they only have four boxes in their brain, and they can only know how to do up to four activities as a result; for example, if a Shadok knows how to ride a bike, and doesn't know how to read, and if their brain is already full, they'll have to unlearn how to ride a bike if they want to learn how to read.
21st Nov '17 11:33:51 PM PaulA
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* In the ''Series/DoctorWho'' [[Literature/DoctorWhoNewAdventures New Adventures]] novel ''All-Consuming Fire'', a character with psychic abilities (pyrokinesis, specifically) is discovered to have suffered a major head trauma that destroyed a large chunk of his brain. Bernice mentions the 90% thing, and speculates that the man's brain, in the course of rerouting around the damage, started using a previously unused part of the brain and activated the pyrokinesis.

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* In the ''Series/DoctorWho'' [[Literature/DoctorWhoNewAdventures New Adventures]] novel ''All-Consuming Fire'', ''[[Recap/DoctorWhoNewAdventuresAllConsumingFire All-Consuming Fire]]'', a character with psychic abilities (pyrokinesis, specifically) is discovered to have suffered a major head trauma that destroyed a large chunk of his brain. Bernice mentions the 90% thing, and speculates that the man's brain, in the course of rerouting around the damage, started using a previously unused part of the brain and activated the pyrokinesis.
12th Oct '17 11:00:51 PM johnsmithxxi
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* ''Series/MyFavoriteMartian'': Cited by "Uncle Martin" as one of the reasons Martians are so much more advanced and intelligent than human beings. Martians use all of their brains, while earthlings only use a small percentage of theirs.
11th Sep '17 7:38:26 PM Siggu
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[[folder:Music]]
* In the Music/LesLuthiers play ''Manuel Darío'', one of the people that is interviewed about the titular character is a psychologist. He has a theory in that people waste 50% of their mental capacity, and that [[StealthInsult Manuel Darío was mentally gifted]] ([[UnreliableNarrator or at least it's what Manuel Darío thought he said]]) because he wasted '''100%''' of his mental capacity.
[[/folder]]
18th Aug '17 6:21:12 PM ZerroDefex
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** It was not a railroad spike but a tamping rod, something much bigger and the explosion literally caused it to rocket through his skull and land on the ground some distance away. His coworkers assumed that he was dead until he started talking and tried to get up like nothing had happened.
13th Jul '17 3:47:30 PM Vir
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* In the [[WesternAnimation/TeenTitansGo Teen Titans Go!]] episode ''"Brain Percentages"'' the use of this trope is heavily lampshaded; first Cyborg points out how incorrect it is but the other Titans dismiss him because it wouldn't be used in so many shows and movies if it weren't true. Beast Boy increases the percentage of his brain anyway and along the way [[{{Film/Lucy}} travels back in time to physically contact his prehistoric ancestor and inexplicably becomes a reality warping computer at 100% brainpower]]. This is all to solve a hidden images puzzle by the way.

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* In the [[WesternAnimation/TeenTitansGo Teen Titans Go!]] ''WesternAnimation/TeenTitansGo'' episode ''"Brain Percentages"'' "Brain Percentages", the use of this trope is heavily lampshaded; first Cyborg points out how incorrect it is but the other Titans dismiss him because it wouldn't be used in so many shows and movies if it weren't true. Beast Boy increases the percentage of his brain anyway and along the way [[{{Film/Lucy}} [[Film/{{Lucy}} travels back in time to physically contact his prehistoric ancestor and inexplicably becomes a reality warping computer at 100% brainpower]]. This is all to solve a hidden images puzzle puzzle, by the way.
7th Jul '17 9:25:15 AM ChronoLegion
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* Mentioned and immediately debunked in ''Literature/RunProgram''. The person debunking it compares it to a car driving on a highway. If it was operating at 100% capacity, then ''every single system would be on at the same time''. Imagine wipers constantly working, both the gas and the brake pedals floored, with every single gear engaged (including the reverse), and doors constantly opening and closing. That would be our brains at 100%.
27th Jun '17 10:34:23 PM LemonsAreLikeCandy13
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* In the [[WesternAnimation/TeenTitansGo Teen Titans Go!]] episode ''"Brain Percentages"'' the use of this trope is heavily lampshaded; first Cyborg points out how incorrect it is but the other Titans dismiss him because it wouldn't be used in so many shows and movies if it weren't true. Beast Boy increases the percentage of his brain anyway and along the way [[Film/Lucy travels back in time to physically contact his prehistoric ancestor and inexplicably becomes a reality warping computer at 100% brainpower]]. This is all to solve a hidden images puzzle by the way.

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* In the [[WesternAnimation/TeenTitansGo Teen Titans Go!]] episode ''"Brain Percentages"'' the use of this trope is heavily lampshaded; first Cyborg points out how incorrect it is but the other Titans dismiss him because it wouldn't be used in so many shows and movies if it weren't true. Beast Boy increases the percentage of his brain anyway and along the way [[Film/Lucy [[{{Film/Lucy}} travels back in time to physically contact his prehistoric ancestor and inexplicably becomes a reality warping computer at 100% brainpower]]. This is all to solve a hidden images puzzle by the way.
24th Jun '17 8:44:36 PM LinTaylor
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* Tohru brings this up during a conversation in ''Manga/MissKobayashisDragonMaid''. [[PlayedForLaughs Note that Tohru is a dragon with almost zero understanding of human biology and she brought it up in response to seeing a magic trick]].

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* Tohru brings this up during a conversation in ''Manga/MissKobayashisDragonMaid''. [[PlayedForLaughs Note that Tohru is a dragon with almost zero understanding of human biology and she brought it up in response to seeing a magic trick]]. The English dub works in a TakeThat against ''Film/{{Lucy}}'' by having Tohru say that she heard about it from a "should-be-forgettable movie".
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