Researcher uses card trick to reveal unconscious knowledge

(Medical Xpress) -- Spanish neuroscientist Luis Martínez of the Institute of Neurosciences in Alicante, has shown that an exception exists regarding “change blindness” and it can be demonstrated by using a simple card trick known as the Princess Card Trick. In the trick, the “magician” shows the viewer five cards and asks them to mentally pick one. They are instructed to not say which it is. The magician then turns the deck over, shuffles it a little bit, then removes one card from the deck and lays it face down on the table. The remaining cards are then turned back over and shown to the viewer, who finds that the card they mentally picked is now missing.

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