A set of cards used in ESP testing such as Zener cards. A subject tries to determine or “guesses” the symbol on card being viewed by a tester or predicts the next card and each card appears a fixed number of times. Statistical analysis of tests run using a closed deck uses different protocols than testing using an open deck. (See “Open Deck.”)
Our Llewellyn Virtual Author Forums are a bi-monthly series of free online roundtable events featuring your favorite Llewellyn authors discussing topics important to you and answering your questions.
Our latest in the series, on Tarot and...