Zener cards
Cards used to test a subject's level of extra sensory perception / From Wikipedia, the free encyclopedia
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Zener cards are cards used to conduct experiments for extrasensory perception (ESP). 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).[1][2]