OkReputation5225

I've been searching for a while and can't seem to find any explanations or even examples of this technique anywhere.

Here's what happened (as the spectator I have no info on anything done besides what I saw):

The spectator choses a card from a standard deck of 52 playing cards. They look at it, memorizes it, and puts it back. They are then instructed to focus on the card and visualize it in their mind while saying three random words of their choosing. The performer then tells them what their card was just based off of their answer.

Other details I know about the trick:

1. The deck isn't any type of trick deck, it has all 52 cards. The backs have a subtile indication as to which way is