Which of these orange circles do you think is bigger?

Well, neither is, they're actually the same size.

Now, stare at the dot inside this circle...

Keep staring and the circle seems to disappear!

But it doesn't really...

Why do our brains lie to us?

We'll sometimes It just takes shortcuts.

Lets take this first image for example.

The Ebbinghaus illusion.

Even though the right orange circle may look bigger, it's not.

See?

Rather than taking time and energy to think critically, your brain makes assumptions.

It sees that the right circle looks bigger in context with all the other smaller circles, and believes it's larger than the other orange circle.

But when you look harder, you realize they're the same.

Now have a look at this.

This is known as the Snake Illusion.

It might look like it's moving but I promise it's not.

Scientists have found that tiny eye movements called saccades occur when you look at this image.

Your brain mistakes these eye movements for motion in the image, activating the part of your brain that processes movement.

Ok, I'm really dizzy now.

Let's move on.

Okay next up, I want you to stare at the bird on the screen.

Just the bird.

Keep staring.

Now look at the cage.

Did a red bird appear inside the cage?

That happens because some of the color-sensitive receptors in your retina adapt to the color green after focusing on it for so long.

When you look at the white cage, your eye is still adapted to green.

But since it isn't there, your eye gives you the same shape in the complementary color––

red!

Okay I'm gonna let this bird go because my dog is trying to kill it.

Our brains don't just trick us with optical illusions like these.

When you were a kid you might have played the game “Bloody Mary”?

It's when you stare at yourself in the mirror in a dark room and call out, “Bloody Mary!” three times

Some people see horrible things in the mirror!

Well, what's happening is something called the Troxler Effect.

Your brain focuses on the thing it deems most relevant - whatever facial feature you're staring intently at.

Other parts of your face can become distorted or even replaced with more body parts.

Some features can disappear all together!

How do i look now?

Am I ready for my close up?

This Troxler Effect is also why that blue circle you saw earlier disappeared when you stared at the red dot!

But what about magic tricks?

Have a look at Zig Zag girl.

You might think that there's no way a person could contort themselves into a shape like that.

What about now?

It's a lot more realistic.

When the boxes are painted, our brains don't see the person inside as one continuous object so it gets confused.

This is Gestalt's principle of continuity in action.

Designs with lines that suddenly change direction are a lot harder to comprehend and magicians use that to their advantage.

While all these brain and visual malfunctions are normal, some conditions can trick your brain even more.

And psychiatric illnesses can result in auditory hallucinations, hearing voices or things that aren't there.

There's still so much we don't know about the brain but studying its response to optical illusions could help scientists learn so much more about how it really functions.

Do you have a favorite optical illusion?

Has there ever been a time where your brain has lied to you?

Let us know in the comment section below!

And If you enjoyed this video, you're definitely gonna wanna check out the video we did on how you can control your dreams.

You may have heard of lucid dreaming.

General lucid dreaming is when you know you're dreaming while it's happening.

Some lucid dreamers even say they can control their dreams.

My name is Blocko!

This has been Life Noggin!

Don't forget to Keep On Thinking!