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The "Psi" symbol used here has been hijacked by the parapsychology contingent - I don't know how to find a better one, though Carrionluggage 02:51, 18 February 2006 (UTC) reply

This article has been expanded as part of my class's participation in the APS Wikipedia initiative. Class is History and Systems of Psychology, North Dakota State University, Spring 2013. It is no longer a stub.