Salocin

Eye test

We often overestimate how good our senses are, because we don't realize the extent to which our brain fills in the blanks. When you can't quite hear every word someone is saying, you don't necessarily notice because you can extrapolate the missing words from the context of what's being said. What happens when your brain is tricked into filling in the blanks incorrectly? To answer this question, count the black dots in the image (click to expand). This image nabbed from this site.