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How optical illusions trick your brain - Nathan S. Jacobs

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  • Опубліковано 18 сер 2024
  • View full lesson: ed.ted.com/less...
    Optical illusions are images that seem to trick our minds into seeing something different from what they actually are. But how do they work? Nathan S. Jacobs walks us through a few common optical illusions and explains what these tricks of the eye can tell us about how our brains assemble visual information into the 3D world we see around us.
    Lesson by Nathan S. Jacobs, animation by TED-Ed.

КОМЕНТАРІ • 238

  • @brandonvillatuya9539
    @brandonvillatuya9539 8 років тому +197

    I don't know but upside-down Abe is creeping me out

  • @greenlionawesomeness
    @greenlionawesomeness 7 років тому +111

    I get why the illusions work the first time, but why doesn't the brain adjust it once it realizes that it's assumptions are false? :(

    • @stellarlies9763
      @stellarlies9763 7 років тому +45

      Eden Kaufman because that's how the brain works. You're not being tricked by the environment, you're being tricked by your own cognitive process, the brain simply can't change the way it works with this kind of new information, because doing that would also change how you see 3D images. This illusions have place because the brain is always assuming we're watching tridimensional objects. You're brain isn't going to change itself for you to watch different something it doesn't even affects you. You see the concave for the lightening, and even if you know that's true, you can still perceive the lightning and will keep understanding the universe as it behaves outside laboratory testes like this one's.

    • @stellarlies9763
      @stellarlies9763 7 років тому +10

      Eden Kaufman besides, the definition of am illusion is precisely that you can't stop perceiving it that way no matter which amount of new information.

    • @0xVENx0
      @0xVENx0 6 років тому +7

      didnt u hear what he said? ur brain tries to be as efficient as it can be, so it figures out that there is no need to keep them

    • @thalespro9995
      @thalespro9995 5 років тому +2

      Underated comment

    • @gabrialtome4478
      @gabrialtome4478 4 роки тому +1

      Although that is true your eyes are just sending you raw data your brain interprets it and sometimes your brain interprets it as fake. Now is it a trick of the brain if the brain knows it an optical illusion.

  • @MS-gv6jd
    @MS-gv6jd 10 років тому +115

    i learn more from ted-ed than in school

    • @thegamergirl6164
      @thegamergirl6164 2 роки тому +1

      same

    • @jasp3r3nr0b8
      @jasp3r3nr0b8 2 роки тому +1

      It’s weird that that is true but we learn different rhings

    • @lightlingzooma-69
      @lightlingzooma-69 Рік тому +1

      Dang bro just roasted the whole educational system

    • @flop.a
      @flop.a Рік тому +1

      Nice but then you would have to score an A+ in UA-cam

    • @HeadlessDino
      @HeadlessDino 11 місяців тому

      FRRRRR

  • @thegamingchannel9899
    @thegamingchannel9899 8 років тому +53

    4:09 Oh my God that's creepy, especially with the shadow on the eyes

  • @littlearttalks
    @littlearttalks 10 років тому +47

    This is a great explanation that breaks down exactly how our eyes are led to see optical illusions!

  • @hibak_
    @hibak_ 3 роки тому +16

    This was very well explained thanks, Im always seeing optical illusions but never completely understood how they happened

  • @user-ci2lg1lw5b
    @user-ci2lg1lw5b 3 роки тому +6

    착시현상이 우리들의 두뇌를 속이는 방법에 대하여 배워보는 시간이 되었습니다. 보는 눈의 시점으로 착시현상을 이해해보는 시간이 되었습니다. 정말 재미있는 시간이 되었습나다. 감사합니다.

  • @volatileaxolotl707
    @volatileaxolotl707 3 роки тому +14

    My brain is gonna be so pissed at me for watching like 50 of these in like an hour.

  • @AndrewHelbig
    @AndrewHelbig 9 років тому +5

    I can't believe I didn't notice that lincoln illusion when it was first shown upside down. Pretty cool stuff.

  • @StarlightNkyra
    @StarlightNkyra Рік тому +3

    4:00
    Me when the water starts rising after squatting at the local taco bell

  • @Aurora59730
    @Aurora59730 10 років тому +18

    That upside down Lincoln creeped me out once it was the right side up :-/ Gonna haunt me in my sleep!

  • @darshansk139
    @darshansk139 10 років тому +31

    What software do you use to make these videos? :O

    • @TEDEd
      @TEDEd  10 років тому +94

      We mostly used Adobe After Effects for compositing, and Dragonframe for stop-motion animation.

    • @fastndd
      @fastndd 10 років тому +8

      TED-Ed Thx, I might use some tricks for some artwortks ^^ as i know a bit now how the brain work

    • @jeerananatawimonporn6104
      @jeerananatawimonporn6104 7 років тому

      Darshan

    • @darshansk139
      @darshansk139 7 років тому +1

      Yes jeeranan?

  • @abigailjieyeelim6702
    @abigailjieyeelim6702 8 років тому +4

    if you change it into the colors used in graphs for math (green lines and white bg), could it have no effect on us?

    • @OPinionssss
      @OPinionssss Рік тому

      i think no.
      my marks still gonna be constant and 0

  • @tobiahgonzalez5381
    @tobiahgonzalez5381 10 років тому +6

    The narrator has got to be the best narrator I know, (well, 2nd to Morgan Freeman XD) He always makes the video soothing to hear and very clear. Kudos to the Narrator! ^^ (who ever he is)

  • @reginald6183
    @reginald6183 10 років тому +7

    Mind Blown

  • @100Hasake
    @100Hasake 10 років тому +15

    I still don't understand the explanation about lateral inhibition

    • @dig_deep_
      @dig_deep_ 10 років тому +5

      Lateral inhibition increases contrast, meaning when a light and a dark thing are near each other, the light thing appears lighter and the dark thing appears darker. The illusion in the video works because the intersections of the grid have less black near them than any other point on the lines, and the relative lack of contrast between the intersections and the background causes the intersections to appear darker than they are. I don't know why this is only noticeable in peripheral vision, maybe you can look that up if you're interested.

    • @TheDarioSmiles
      @TheDarioSmiles 7 років тому

      Alabaster I guess that is because of the receptors that pick up black and white (or rather light and dark) and the lack of them in the middle of your retina.

  • @GinaaTheCheerleader
    @GinaaTheCheerleader 10 років тому +18

    When the Abe photo was upside down it looked creepy at first then I noticed what was up when it turned around.. it looks weird both ways tbh.

  • @AlfaAxel
    @AlfaAxel 9 років тому +2

    The white point is surrounded by more white on all four sides than any white point along a line segment.
    Does the language make sense? Does he refer to a Hermann grid where there is no highlighting of the intersections?
    I think there is an error in the text or the name of the grid. Wikipedia distinguishes between Hermann Grid illusion and the scintillating illusion. Wikipedia also shows that some researchers have contended (doubted) that the lateral inhibition actually can be used as an explanation - but then again, references are missing.

  • @SHIMMYshookmybone
    @SHIMMYshookmybone 10 років тому +5

    Great video! Awesome animation too :)

  • @adjoabaidoo6545
    @adjoabaidoo6545 10 років тому +5

    Very interesting(as usual). Good work

  • @MarioLuigi0404
    @MarioLuigi0404 8 років тому +3

    The muffin pan looks normal to me. Just the one looks like a flashlight is focused perfectly on one spot.

  • @EricsWisdom
    @EricsWisdom 10 років тому +21

    Awesome channel!

  • @safayet269
    @safayet269 10 років тому +4

    Excellent explanation :)

  • @SkeletonKingYoutube
    @SkeletonKingYoutube 8 років тому +6

    the pan is not defective the cup has inverted shadow

  • @hmoodiealjunaibi1196
    @hmoodiealjunaibi1196 10 років тому +9

    4:00 this gave me nightmares for 2 weeks
    you should make a creepypasta about it XD lol

  • @bakirev
    @bakirev 10 років тому +3

    I have that same plastic eye model at 1:48. The quality is absolutely terrible.

  • @Sam-tf9ip
    @Sam-tf9ip 8 років тому +87

    The Abe Lincoln didn't work on me...

    • @benjohnson8256
      @benjohnson8256 8 років тому

      mlg

    • @grrr1351
      @grrr1351 8 років тому

      Yup. I thought it was a Dracula version of him. Till now I don't understand what the narrator meant

    • @namelessname5553
      @namelessname5553 8 років тому

      +ROBIE
      Could it be related to autism in some way?
      You know, he said about how we focus on the mouth and eyes for knowing the emotions of the people you are seeing.

    • @Sam-tf9ip
      @Sam-tf9ip 8 років тому

      Nameless Name wow.

    • @aleaf01
      @aleaf01 8 років тому +1

      +Nameless Name No. I have autism and it kinda worked on me. Also that was harsh.

  • @CaritasGothKaraoke
    @CaritasGothKaraoke 8 місяців тому +1

    Yeah those upside down faces never work on me. I can instantly tell the eyes and mouth are flipped.

  • @MrYanliang
    @MrYanliang 8 років тому +1

    i saw the muffin pan and when u said the one facing the other way popped up i was like what arent they all flat?
    also i found the second picture suspicious instantaneously

  • @94gsh
    @94gsh 8 років тому

    I don't understand very much what is lateral inhibition. Could you explain me, please?

  • @calhasbrouck1
    @calhasbrouck1 7 років тому

    I love watching these

  • @nikolacode
    @nikolacode 8 років тому

    That Lincoln face is unsettling.

  • @missingno3391
    @missingno3391 8 років тому

    The 3D glasses in the top right are backwards. Idk if the colors are in the right place but left and right are in the wrong place.

    • @chrisquint3656
      @chrisquint3656 8 років тому

      they are the old school cardboard 3d glasses folded up. red for right eye and blue for left...

  • @-Sanctuary-
    @-Sanctuary- 9 років тому +4

    For some reason i wasn't tricked by the muffin pan illusion.

  • @Markus9705
    @Markus9705 10 років тому +3

    Damn you evolution! :P

  • @azaraftimos9146
    @azaraftimos9146 10 років тому

    Thanks

  • @ajajgamers2965
    @ajajgamers2965 10 років тому

    Who do u get these optical illusions from

  • @JY-tq4ir
    @JY-tq4ir 3 роки тому

    great video 4:10 brain shortcut is to focus only eyes & mouth to picture FACE

  • @flyerairy6889
    @flyerairy6889 3 роки тому

    No way, that’s so cool!

  • @BallotBoxer
    @BallotBoxer 10 років тому +4

    The Lincoln illusion didn't work for me. The manipulated photo looked just as busted upside-down as it did rightside-up. A better illustration of finding faces in nothing would have been pictures of car bumpers, knots in bark or wherever faces coincidentally appear.

  • @reececowan7403
    @reececowan7403 10 років тому +1

    1:50
    I have the same eye model on my desk. Go figure.

  • @user-nt4ve5hj2z
    @user-nt4ve5hj2z 3 місяці тому

    this is so cool

  • @PrakashBharti786
    @PrakashBharti786 8 років тому

    you are too good...

  • @jonahkruszyna8003
    @jonahkruszyna8003 7 років тому +4

    I forgot to breathe during this video 😂

  • @BinkieMcFartnuggets
    @BinkieMcFartnuggets 10 років тому +2

    The grid illusion works with other things too. If you stare at a woman's breasts long enough, your peripheral vision will not see her hand coming to slap you in the head.

  • @wotgamerz9212
    @wotgamerz9212 Рік тому

    Wait
    I didn't see grey flashes in the grid, does that mean my eyes are defective?

  • @matthewwatts6257
    @matthewwatts6257 2 роки тому

    I have that same eye model

  • @tomasguerra9761
    @tomasguerra9761 8 років тому

    please put how do we know how we feel

  • @lolbro8701
    @lolbro8701 8 років тому +4

    I have a weird reflex when I clean my right ear I want to cough I know it's got nothing to do with the video but just saying

  • @Mackeye_
    @Mackeye_ 8 років тому +4

    Abe Lincoln looks so creepy!

  • @zmanwitzplan3180
    @zmanwitzplan3180 8 років тому

    on the first one it stayd gray for a few sec.

  • @jwilham
    @jwilham 10 років тому +1

    im sorry... but i could tell abe's face was totally fucked up as soon as i saw it. lol

  • @alaaalsaudi1451
    @alaaalsaudi1451 4 місяці тому

    me too

  • @seiichimangat6444
    @seiichimangat6444 7 років тому

    Very helpful thanks😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊

  • @MichaelPomeroyinmauritania
    @MichaelPomeroyinmauritania 10 років тому

    damn! that grid makes my head swim. If i look for even a moment, i get all dizzy and the lines pulse and the intersections flash grey, black, and white. Thats not what the video said was supposed to happen. Am I broken?

  • @vaibhavsalunke7733
    @vaibhavsalunke7733 4 роки тому

    The muffin pan illusion doesn't work as well as the grid(for me personally atleast) since I expect a shadow of the dome on the pan

  • @smile-yl2sb
    @smile-yl2sb 8 років тому +2

    i watch brain games so my perefreal vision is trained for this :) bring it on.

  • @doof339
    @doof339 3 роки тому

    Well my brain is really stubborn.
    Though it now knows the reason it still showing that muffin mould upside down and the grid something like blinking

  • @lucbriant
    @lucbriant 7 років тому

    Literally closed the video the moment they inverted Abe

  • @vixen_9962
    @vixen_9962 7 років тому +1

    I wonder what would happen if you raised a child from birth with real optical illusions and separated them from others then sat them down to look at these images. What would they see?

  • @eine4768
    @eine4768 2 роки тому +1

    Upside down Abraham Lincoln will forever haunt me

  • @chrishomere6557
    @chrishomere6557 10 років тому

    Man, Lincons gonna give me nightmares

  • @someperson3163
    @someperson3163 7 років тому +4

    I think I've watched too much of these vids cuz my head hurts...
    :I

    • @astro-animation
      @astro-animation 7 років тому +1

      Ikr? These stupid things are addicting. :O

  • @anishaghosh101
    @anishaghosh101 2 роки тому

    You know I could not complete the video because that grid kinda bothered me

  • @stephtoms6444
    @stephtoms6444 10 років тому

    I wasn't fooled by the Abraham Lincoln, and I don't get how the muffin pan has a dome not dip…. I love the grid one too!

  • @jessicanelson6954
    @jessicanelson6954 6 років тому

    me to

  • @ajajgamers2965
    @ajajgamers2965 10 років тому

    Whoa some of these are trickey

  • @deusexmachina1253
    @deusexmachina1253 4 роки тому

    When u fall to Sharingan Genjutsu..

  • @dayswillburn777
    @dayswillburn777 3 роки тому

    Am I the only one that recognized the weirdness of the upside-down Lincoln from the start lol?

  • @ChanBerlin
    @ChanBerlin 8 років тому

    Oh!Inside Out!I like this movie

  • @spartan9268
    @spartan9268 8 років тому

    they tell me about the eyes and how did i not notice. that but berd

  • @user-yn6yu2rq8d
    @user-yn6yu2rq8d Місяць тому

    I am immune to any illusions

  • @carrinetrower141
    @carrinetrower141 7 років тому

    Why do I see a grey cloud looking vertex when I look into the sky that looks like a hole in the middle

  • @Robert6P6M
    @Robert6P6M 10 років тому +1

    The spots were brown.

  • @kimberlyanntugagao7482
    @kimberlyanntugagao7482 6 років тому

    4:01 this so scary lol

  • @umaninstrumentalityprject2989
    @umaninstrumentalityprject2989 4 роки тому

    if u look at the upside-down Lincoln then focus on his eyes u will see something u will not be able to un-see and it will haunt u for your life

  • @HBKnowItAll
    @HBKnowItAll 6 років тому

    Every animation you do or Disney is optical illusion because they look like they are moving when they are not (Rip Disney paper animation 1937-2009)

  • @Ray2311us
    @Ray2311us 3 роки тому

    memory bias of the mind

  • @reesegil9627
    @reesegil9627 8 років тому +1

    Instead of seeing gray in the first optical illusion I see red. Anyone else?

    • @chaks94
      @chaks94 8 років тому

      +Cango Mango Probably you are color blind

  • @CodyWhy
    @CodyWhy 10 років тому

    Now my brain hurts

  • @rayvin9492
    @rayvin9492 8 років тому

    wow

  • @transformingbeast3482
    @transformingbeast3482 8 років тому

    do a video about backwards messages

  • @semvermeulen7039
    @semvermeulen7039 Рік тому

    dan dis illusion is so real it work even it is post

  • @dakshbadal7522
    @dakshbadal7522 4 роки тому

    4:09 I am officially closing this video.

  • @mrsmamalove
    @mrsmamalove 7 років тому

    The Abraham Lincoln one gave me nightmare!

  • @Im_A_Nerd
    @Im_A_Nerd 2 роки тому

    the muffin pan and abe lincoln painting things at the start didnt work on me? weird

  • @xxx_robloxmasteroof5160
    @xxx_robloxmasteroof5160 4 роки тому

    I don’t think the grid trick works if the white spots are a bit bigger

  • @rugma1696
    @rugma1696 7 років тому

    that upside down Abraham Lincoln... omg nightmaree

  • @Coolcat-zl7bl
    @Coolcat-zl7bl 8 років тому

    That's cool

  • @liberg101tm4
    @liberg101tm4 7 років тому

    Ted-ed its tricking my eyes it turns black when I change the spot

  • @olexandrantipov9882
    @olexandrantipov9882 7 років тому

    that fave upside down iss creeping me out to its creepy

  • @ThunderCatchers
    @ThunderCatchers 7 років тому

    How did the muffin pan illusion work?

  • @liruoyin
    @liruoyin 4 роки тому +1

    IT CAN KILL YOU !!!!????

  • @Dan-bw9vl
    @Dan-bw9vl 9 років тому

    Is anyone freaked out by that upside-down abe face thing? It's just starting into your soul...

  • @user-my6ko4mo9d
    @user-my6ko4mo9d 9 років тому

    good!!!!!!!!!

  • @susanmcdonald6879
    @susanmcdonald6879 8 років тому +2

    thanks, enjoyed this very much! It just shows to go ya', that our visual sense is a bit unreliable, in the Platonic sense that is :) we are easily fooled...we are chained in the cave viewing shadows of reality, not reality itself, . and what about the Parthenon?...how there is not a straight line in the entire building (to compensate for heaviness, etc) you can actually put a hat on the steps on one end, and you can't see it at the other end.... It's also interesting that our sense of hearing, the last sense to go when we die, is much more "rapid" in its translation & connection to the world, no upside_down screen that is reversed only in the brain, takes time to do all that, not so with hearing....& more than vision is the Greek "logos", reason, logic , sound.... speech, discussion, debate, communication.... interesting implications there, don't you think? that reality is largely invisible....

    • @andylee8602
      @andylee8602 2 роки тому

      🤪🤪🤪

    • @ThatFoxxoLeo
      @ThatFoxxoLeo Рік тому

      This looks like complete word mush, the ramblings of someone trying to seem smart

  • @kyleight4523
    @kyleight4523 7 років тому +1

    I will not be able to sleep tonight

  • @floydsteel1703
    @floydsteel1703 8 років тому

    I see black dots not grey

  • @rcuadra100
    @rcuadra100 3 роки тому

    that abehr ham lincoln one scares me srry bout my spellling in in 3rd grade im 9

  • @ismatara1260
    @ismatara1260 7 років тому

    1:46 Is that the eye of cthulhu????