In a test of general extrasensory perception, the individual (human or animal) 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 extrasensory perception, the individual about whose mental states information is acquired by a percipient; the term is very occasionally used to refer to the subject in a test of psychokinesis or the focus in a poltergeist case. [From the Latin agens (agentis), derived from agere, “to drive, do”]