Les illusions d'optique sont comme de petits tours que votre cerveau vous joue, et elles ne manquent jamais de vous laisser vous gratter la tête. Certaines illusions font qu'une image fixe semble bouger, tandis que d'autres vous font douter si deux lignes ont vraiment la même longueur. Il y a celles célèbres, comme la robe qui était bleue et noire ou blanche et dorée, et elles ont littéralement divisé internet. Puis il y a l'illusion où un dessin plat semble soudainement en 3D—votre cerveau comble simplement les lacunes ! Ces casse-têtes ne sont pas seulement amusants ; ils enseignent également aux scientifiques comment nos cerveaux traitent les informations visuelles. Alors, la prochaine fois que vous voyez une illusion d'optique, rappelez-vous—c'est la preuve que votre cerveau est un peu trop doué pour tirer des conclusions hâtives ! Animation créée par Sympa.
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Musique par Epidemic Sound https://www.epidemicsound.com
Pour ne rien perdre de Sympa, abonnez-vous!: https://goo.gl/6E4Xna
----------------------------------------------------------------------------------------
Nos réseaux sociaux :
Facebook: https://www.facebook.com/sympasympacom/
Instagram: https://www.instagram.com/sympa.officiel/
Stock de fichiers (photos, vidéos et autres):
https://www.depositphotos.com
https://www.shutterstock.com
https://www.eastnews.ru
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Si tu en veux encore plus, fais un tour ici:
http://sympa-sympa.com
Category
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FunTranscript
00:00And yes, it's the face of Kim Kardashian, at least technically.
00:05I understand, it's hard to believe.
00:07How can someone so glamorous seem so strange?
00:11Take a moment to think about what's going on here.
00:15And let's see if your mind can elucidate what your eyes don't seem to be able to grasp.
00:21We should really try with other famous figures.
00:24But let me first explain the principle to you.
00:27You have just seen the fascinating illusion known as the reverse effect of the face.
00:33Discovery.
00:3445 years ago, this illusion continued to surprise and amaze the public.
00:39Here is how it works.
00:40The image is reversed.
00:42But some very essential elements of the face, such as the eyes and the mouth,
00:45retain their usual orientation.
00:47For the illusion to be effective, it is crucial to modify only these key elements.
00:52This discovery highlights a flaw in the way our brain treats faces.
00:57Rather than perceiving them as a whole,
00:59we analyze each component individually before reconstructing the whole.
01:04Now let's take a look at Lady Gaga.
01:06While you watch her, try to understand what's going on here.
01:10Admit that it's rather hilarious.
01:12Wait, is it Ariana Grande?
01:14To be honest, she is unrecognizable.
01:16Such a funny illusion would well deserve its own Instagram filter.
01:20Anyway, it's time to really explain to you what it's all about.
01:24I have a fascinating experience to offer you.
01:27Look at this image for a moment.
01:30Notice what happens with the contours?
01:33They seem to fade away, disappearing as if by enchantment.
01:36Then, as if by magic, the empty areas take on a greenish hue.
01:40This amazing visual effect is known as the Troxler effect.
01:44When you stare at a point for too long, your brain begins to ignore what surrounds it.
01:49In a way, it decides that nothing new is happening in this place
01:53and keeps an eye on it for a few moments.
01:55Thus, while you think you are observing the image as a whole,
01:59your brain silently eliminates the details it considers uninteresting.
02:04Trust me on this.
02:06If you keep looking at these black and white points for a long time,
02:10something, or rather someone, will eventually appear.
02:13Here's a clue.
02:14This person is a singer, young and of great beauty.
02:18So, have you guessed who it is?
02:21It's Lana Del Rey, ladies and gentlemen.
02:24You just have to adjust your gaze to distinguish the silhouette behind all these visual distractions.
02:30There you go, the trick is done.
02:33Here's an intriguing scene.
02:35Shakira and Miley Cyrus gathered in the same room.
02:38But why does Shakira seem so huge, while Miley seems tiny?
02:43In reality, Miley, with her 1.65m, is taller than Shakira, who only measures 1.57m.
02:50I'll leave you for a few moments to try to solve this riddle.
02:54This is a classic optical illusion.
02:56If you have ever visited a children's museum,
02:59it is likely that you have seen one of its installations, the famous Ames Chamber.
03:04This device creates a total distortion of perception.
03:07Let's take a look behind the scenes.
03:09The Ames Chamber is designed with a floor and an inclined ceiling,
03:13transforming the room into a kind of trapeze.
03:15When you look at it, your eyes are deceived,
03:18giving you the illusion that the two sides of the room are identical.
03:21But this is not the case.
03:23It all depends on how your eyes interpret the depth.
03:26A person moving to the left of the room is actually further away,
03:30with a higher ceiling, which gives the impression that it is shrinking.
03:33Conversely, when it is on the right, it seems much larger.
03:38Look carefully at this staircase.
03:41It seems ordinary, doesn't it?
03:43Now, let's turn it over.
03:45It keeps the appearance of a staircase.
03:47But instead of going from right to left,
03:49it now seems to go from left to right.
03:52The secret to maintaining this illusion is simple.
03:55Do not blink your eyes.
03:59If you do, the illusion will disappear instantly,
04:03and the original image will reappear.
04:05This fascinating illusion is called the Schröder staircase.
04:08Although it seems simple at first glance,
04:11it highlights fundamental aspects of the functioning of our brain.
04:15By breaking down this staircase,
04:17we discover that it is actually flat.
04:19What your brain perceives as a three-dimensional structure
04:22results only from a subtle play of shadows and light.
04:26This 3D effect is therefore nothing more than a skillful optical illusion.
04:30Our brain, used to interpreting images
04:32according to our past experiences,
04:34detects a shadow in a 2D image,
04:37fills in the gaps,
04:38and projects an impression of non-existent depth.
04:41Here, it makes us believe in a three-dimensional perspective.
04:45Impressive, isn't it?
04:46Wait a moment.
04:47You don't need any special equipment
04:49to understand what's going on with Adele's face.
04:52Just focus your gaze on the little white dot
04:55located in the center of the image.
04:57I'll tell you when you can turn your eyes away.
05:00Take the time to look closely at her face.
05:03We need your full attention for a few seconds.
05:06When I say,
05:07go,
05:08fix a white wall or a sheet of blank paper.
05:11Ready?
05:123,
05:132,
05:141.
05:15Now.
05:16It's crazy, isn't it?
05:17This phenomenon is known as the illusion of the remaining negative image.
05:22First, you look at an image with inverted colors for a few moments.
05:26Then, by looking at a white surface,
05:29the original image appears,
05:31in this case,
05:32Adele's face.
05:33It seems magical,
05:34but let me explain to you
05:36why this phenomenon is based on scientific basis.
05:39This phenomenon is explained by the fascination of your eyes
05:42and your brain for contrast.
05:44When they are exposed to opposite colors,
05:47they try to restore the balance by reconstituting the correct shades.
05:51Thus, even if the screen is empty,
05:53your mind, like an artist,
05:55imagines and paints the appropriate shades.
05:58Another image with black and white bars,
06:01which is hidden below this time.
06:03Keep watching and you will discover it.
06:07Think of the word baby,
06:08repeated several times,
06:10accompanied by a funky melody.
06:12Did you recognize it?
06:13Yes, it was Shiran.
06:15Ready to blur the tracks?
06:17Look at this very popular optical illusion.
06:20Fix it for a few seconds without moving your eyes.
06:22Do you see something strange?
06:24It is a grid with a broken edge.
06:27If you focus your gaze on the center of the image,
06:30these edges seem to be repaired as if by magic in your peripheral vision.
06:34Your brain, irresistibly attracted by the patterns,
06:37cannot help but recreate them.
06:40This illusion, imagined by Ryota Kanai,
06:42was even a finalist in the contest of the best illusion of the year in 2005.
06:47Kanai explains himself that it illustrates the natural attraction of our visual brain
06:51for regular patterns.
06:53You like snakes, don't you?
06:55These are not scary at all,
06:57and you could watch them twirl all day.
07:00In which direction do they seem to go?
07:02By the way, do they really move?
07:05It may surprise you, but these snakes do not move at all.
07:09The illusion is based on repeated asymmetrical patterns
07:12and combinations of ingenious colors.
07:14Light colors like yellow and white
07:16mix with blues and blacks,
07:18darker,
07:19creating an effect that deceives the retina.
07:22Your brain then receives signals
07:24that give the impression that these circles are moving.
07:27Do you want to pierce the illusion?
07:29Fix your gaze on a single point in the image.
07:31By continuing to do so,
07:33you will see these circles slow down and move.
07:36Ingenious, isn't it?
07:37Let's move on to the last illusion,
07:39and if it fails to deceive your brain,
07:41I surrender.
07:43Look at this photo.
07:44It is in black and white, isn't it?
07:46Take the time to think.
07:48Your brain is probably trying to show you colors,
07:51but don't let it fool you.
07:53What you are looking at is a black and white image
07:56on which are superimposed lines of green,
07:59red,
08:00orange,
08:01yellow and blue.
08:02This saturated gray creates the illusion
08:05that the gray parts are colored.
08:07But to dissipate this illusion,
08:09you just have to zoom in.
08:11You will then see the real colors of the original image.