Les illusions d'optique sont incroyables car elles jouent avec votre cerveau, vous faisant voir des choses qui ne sont pas vraiment là ! Certaines images peuvent sembler être en mouvement, mais elles sont en réalité totalement immobiles. D'autres peuvent dissimuler des visages, des objets ou des couleurs, et c'est à vous de les repérer. Ces illusions trompent votre cerveau en jouant avec les formes, les couleurs et les motifs de manière astucieuse. Les observer peut vous donner l'impression de résoudre un casse-tête, car votre cerveau essaie de comprendre l'impossible. C'est une façon amusante d'explorer le fonctionnement de notre cerveau et de voir à quel point notre esprit peut être facilement trompé ! Animation créée par Sympa. ---------------------------------------------------------------------------------------- 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 ---------------------------------------------------------------------------------------- Si tu en veux encore plus, fais un tour ici: http://sympa-sympa.com
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00:00Look at the center of the cross. No, do not let yourself be distracted by the glamour of the celebrities.
00:05Just keep fixing the cross. Keep going, just a little longer.
00:10And suddenly, something strange begins to happen.
00:14His faces go from superb red carpet to downright bizarre. Isn't it?
00:18What kind of disturbing spell works here?
00:21We promise you, we have not done any photoshop magic.
00:24Look, if we stop this crazy wheel and you focus on the photos,
00:28you will see that Miley Cyrus always looks superb.
00:31This optical illusion is known as the flash face distortion effect.
00:36Basically, these photos are arranged in such a way as to totally confuse our mind.
00:41And our brain loves to compare things.
00:43So, when the images scroll very quickly,
00:46and you see someone with a little nose just after someone with a normal nose,
00:50your brain is confused.
00:51Suddenly, a normal nose can look as huge as Pinocchio's.
00:56It goes the same for the eyes, the lips, everything you want.
00:59As our brain always compares each face to the one before,
01:03it ends up transforming these magnificent celebrities
01:06into exaggerated and frightening versions of cartoons of themselves.
01:11So, tell me, what do you see here? A horse or a seal?
01:15It depends partly on where your eyes are placed first.
01:18If you look at the bottom of the image, your brain probably thinks it's a horse.
01:23But if your gaze first goes to the upper right corner,
01:26suddenly it looks like the tail of a seal.
01:28But it's not just a matter of gaze.
01:30And something even stranger happens here.
01:33When our brain perceives an ambiguous figure with unclear information,
01:37we essentially see what we want to see.
01:40In an experiment, scientists showed this precise image to a group of people.
01:45And they were told that if they spotted a farm animal,
01:48they would get a treat.
01:49Yum!
01:50But if they saw a marine creature, they would get canned beans.
01:55Which is a bit strange, isn't it?
01:57The results showed that 80% of people saw a horse.
02:01So, they decided to change the rules.
02:04This time, anyone who spotted a marine animal would get a reward.
02:08When they changed the motivation, can you guess what happened?
02:12More participants ended up seeing a seal in the second round.
02:16So yes, it seems that psychology plays an important role
02:19in the way we interpret ambiguous images.
02:24We also have these undecipherable figures.
02:27I mean, no matter how much you try,
02:30you simply won't be able to fully understand the image.
02:33Take the impossible trident, for example.
02:35On one side, it looks like three cylindrical shapes,
02:38but on the other side, it looks like they merge into two rectangular parts.
02:43This happens because the center of vision of our brain
02:45does a lot of its work in a subconscious and automatic way,
02:49interpreting the figure as a three-dimensional object.
02:52But when we see this 3D structure,
02:54it simply doesn't make any rational sense.
02:57It's similar to Penrose's triangle.
02:59This triangle is physically impossible to build in the real world,
03:03so we simply can't understand it.
03:08The next optical illusion is the effect of negative remaining images.
03:12Look at the three dots on his nose.
03:14If you hadn't guessed,
03:16it's Jennifer Lopez looking like an avatar character.
03:19But don't worry,
03:20this strange aspect is about to change right in front of your eyes.
03:24Keep your eyes fixed on these three dots in the center of the image.
03:27Don't look away and don't blink.
03:31Okay, on the count of three, we'll switch to a white screen,
03:34but you have to keep your eyes wide open.
03:36Ready? Here we go.
03:38One, two, three, bam!
03:40Can you see what I see?
03:41Yes, it's J-Lo, gorgeous in her red outfit.
03:45Crazy, isn't it?
03:46But there's a solid reason behind this magic.
03:49Our eyes have millions of small light-sensitive cells
03:52called batons and cones.
03:54Batons help us see in low light
03:57and perceive things in peripheral vision,
04:00while cones are dedicated to color,
04:02bright light and fine details.
04:05When light hits these cells,
04:07they excite and send signals to our brains,
04:10where everything is processed to achieve what we really see.
04:13But here's the hiccup.
04:14Conic cells can get tired.
04:17If they fix the same color for too long,
04:19they need a break.
04:20That's when other conic cells intervene to help.
04:24The different cone cells are better
04:26at processing red, green and blue colors.
04:29So, when some cone cells get tired,
04:32the theory of color processing by opposition is triggered,
04:35allowing other cones to take over.
04:38And that's how the colors in J-Lo's photo magically appear.
04:44Hey, hey, look who it is!
04:46Einstein!
04:47Now, fold your eyes.
04:48Or, if you prefer, take a few steps back.
04:51Wait.
04:52Does Einstein suddenly turn into Marilyn Monroe?
04:55This is a hybrid image,
04:57which is like a mixture of two images.
04:59It combines the blurry parts of one image
05:01with the sharp details of another.
05:03In this case, Einstein's image is centered
05:06on fine lines and sharp contours,
05:08such as wrinkles or hair strands.
05:10While Marilyn Monroe's
05:12is more about the whole, with blurry shapes.
05:15When you look away or fold your eyes,
05:17these little details fade away,
05:19and suddenly, Monroe's face appears.
05:22The same thing happens here.
05:24At first, this woman seems a little ugly,
05:26neither happy nor sad.
05:28But if you fold your eyes a little,
05:30suddenly, she really looks angry.
05:32Oh, oh!
05:35Wow!
05:36What a turnaround!
05:38Here are photos of Kim Kardashian
05:40and Timothée Chalamet upside down.
05:42Have you noticed anything strange about them?
05:44You probably haven't,
05:46but if you look closely,
05:48you will see that their eyes and mouth are not inverted.
05:50This is called the illusion of the inverted face.
05:53This happens because our brains are programmed
05:55to recognize faces in place.
05:57We treat them like a whole
05:59and grasp the details very quickly.
06:01But when a face is upside down,
06:03our brains have trouble perceiving these strange details,
06:06like the lines upside down.
06:10This trick is known as
06:13And what's crazy is that these bricks
06:15are not inclined at all.
06:17In fact, the horizontal lines
06:19are perfectly straight and parallel.
06:21This image deceives our brain
06:23because of the way we treat contrast.
06:25The black and white squares
06:27placed next to each other
06:29create a visual conflict,
06:31leading our brain to think
06:33that these lines are curved.
06:35But if you change the colors for something softer,
06:37like pink and blue,
06:39the illusion disappears.
06:41This does not disturb our perception
06:43in the same way,
06:45so we can clearly see the straight lines.
06:47And there is something else.
06:49Look at the layers of mortar between the bricks.
06:51Yes, these gray lines.
06:53The distortion only occurs
06:55when the brightness of the mortar
06:57is between the dark and light squares.
06:59So, if the mortar is too dark or too light,
07:01the illusion disappears.
07:05These strawberries are red, aren't they?
07:07False.
07:09The strawberries are not red at all.
07:11They are gray.
07:13This magic occurs
07:15due to something called color constancy,
07:17which is our ability to recognize
07:19the color of an object
07:21regardless of lighting changes
07:23or environment.
07:25In this experiment,
07:27all the red pixels in this photo
07:29have been replaced by gray pixels,
07:31and we can prove it by zooming.
07:33We feel like there is red in this image
07:35only because the background is blue.
07:37Then, it determines the color
07:39of the objects by compensating
07:41the color of the light source.
07:43When your brain takes these gray pixels
07:45and subtracts this blue bias,
07:47you end up seeing red.
07:49Interesting, isn't it?
07:51The same thing happens with the dress.
07:53If your brain perceives the lighting
07:55as a little yellowish,
07:57it tries to compensate for this golden glow
07:59by showing you the dress in blue and black.
08:01But if your mind thinks
08:03that the background is darker,
08:05and suddenly, the dress appears
08:07white and golden.
08:09So, what is the real color of the dress?
08:11Well, in this case,
08:13it is actually black and blue.
08:15But let's finish this
08:17before diving into this endless debate.