# Brain Tests & Experiments

## Color Reading

If you click the "Start" button, you will successively see a number of words that are names of colors. Each word is written with letters in a certain color. Try to name as fast as possible (out loud) the color of the letters in which the shown word is written. This means that you should not read the words themselves! After each word, you will see a colored dot that shows the color that you should have said.

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You probably noticed that it is rather tough to say the names of the colors very fast, since your brain is also reading the text, which is almost unavoidable...

## Quick Eye Exam

Just do it. Do not cheat! Because of you did, this test would be no fun. We promise that there are no tricks to this test.

Read the sentence below:

```         FINISHED FILES ARE THE
RESULT OF YEARS OF SCIENTIFIC
STUDY COMBINED WITH THE
EXPERIENCE OF YEARS
```

The question: How many times do you see the letter F in the sentence above? Count them only once! Do not go back and count them again!

The answer: Click here!

## Mental Arithmetic Test

Perform the calculation below as fast as you can, and using only mental arithmetic (so without pen and paper, or a calculator!).

 Take 1000 and add 40. Add 1000. Add 30 and then add 1000. Add 20. Add 1000 and then add 10.

The question: What is the result of this calculation?

The answer: Click here!

## Black Dots

Look at the image below.

The question: How many black dots can you find in the image? Note that the image is static (i.e. it is not changing); we are not fooling you!

The answer: Click here!

## Magic Spiral

We offer you a unique optical illusion!

First, make sure the yellow area is visible on your screen. When you have started the animation, you will see a rotating spiral. Stare at the center of the spiral until the animation stops. Then look immediately at the back of your hand!

Press the "Start" button to start the animation.

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The question: What do you observe, when looking at your hand?

The answer: Click here!

## Moving Dot

Look tightly at the black cross and wait for a few seconds.

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The question: What do you see?

The answer: Click here!

## Optical Illusions

Sometimes, our brain sees things different than they are... See for yourself!

The question: Is the center square of stars standing still or moving?

The answer: Click here!

Another question: Is the left center circle larger than the right center circle in the image below?

Another answer: Click here!

Yet another question: Are the horizontal lines parallel, slanting, or curved in the image below?

Yet another answer: Click here!

## Optical Illusions: Ambiguous Images

What you see, may simply depend on how you look at it...

The question: What do you see in this image?

The answer: Click here!

Another question: What do you see in the image below?

Another answer: Click here!

Yet another question: What do you see in the image below?

Yet another answer: Click here!

The fourth question: What do you see in the image below?

The fourth answer: Click here!

The fifth question: What do you see in the image below?

The fifth answer: Click here!

## Optical Illusions: Possible or Impossible

How can we make the impossible possible? That is simple: by drawing it!

Imagine that you are at the place of the arrow and start walking...

The stairs are drawn in such a way, that they look like continuous ascending or descending stairs.

Another question: How many legs does this elephant have?

Another answer: Click here!

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