The subjects had to lie down in a magnetic resonance imaging machine and concentrate on two different lists of printed words posted side by side in front of them. (scientificamerican.com)
When they find a card, they decide which of the words match the definition and then print the word in that box. (tes.com)
I have hung mine from the beams in the classroom so have printed the words on the back and the front. (tes.com)