The definitions of most of the following terms have been borrowed or adapted from A Glossary of Terms Used in Parapsychology by Michael A. Thalbourne (republished by Puente Publications, Charlottesville, VA, USA, 2003). We highly recommend this book to those who seek a more complete glossary of parapsychological terms.

AGENT: In a test of GESP, the individual who looks at the information constituting the target and who is said to "send" or "transmit" that information to a percipient; in a test of telepathy and in cases of spontaneous ESP, the individual about whose mental states information is acquired by a percipient. The term is sometimes used to refer to the subject in ...