In the 1930s, J.B. Rhine at Duke University used a set of Zener cards, which consisted of five unique symbols (wavy lines, a star, a circle, a plus, and a square) in order to study which phenomenon?

Question

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J.B. Rhine used Zener cards to study extrasensory perception, or ESP. Participants were asked to guess which symbol was on the card without seeing it, in order to determine if they had any psychic abilities or connection to a higher power.