Transcript

NARRATOR

Here’s a quick test of your powers of perception. There are two red files and two green files. Count how many times this red file is passed from one person to another in the next 20 seconds. Ready? Start counting.

[Music]

NARRATOR

OK, so how many times did they pass it? If you’ve got near to eight, you’ve done pretty well. But just how much were you paying attention? Watch again.

[MUSIC]

NARRATOR

You may have spotted that this giant mouse joined halfway through the game and then left again. Did you notice? This is called ‘inattentive blindness’ - not being able to see things that are actually there, which can be the result of having to think hard about one thing, and so not noticing something else.