Zener Cards

Zener cards are cards used to conduct experiments for extra-sensory perception (ESP), most often clairvoyance. Perceptual psychologist Karl Zener (1903-1964) designed the cards in the early 1930s for experiments conducted with his colleague, parapsychologist J. B. Rhine (1895–1980).

Read more about Zener Cards:  Design, Use in Experiments, Statistics, Cultural Reference

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