Transcript

TEXT ON SCREEN:

You are about to see three pairs of images that, following a briefly presented flicker, will then be replaced by an almost identical image.

Can you spot what changes?

Image 1.

Note down any changes that you have noticed.

Image 2.

Note down any changes that you have noticed.

Image 3.

Note down any changes that you have noticed.

End of video. Please proceed to the next step.