A procedure proposed by Alan Turing in 1950 for determining whether or not a system (generally a computer) has achieved human-level intelligence, based on whether it can deceive a human interrogator into believing that it is human. A human "judge" interviews the (computer) system, and one or more human "foils" over terminal lines (by typing messages). Both the computer and the human foil(s) try to convince the human judge of their humanness. If the human judge is unable to distinguish the computer from the human foil(s), then the computer is considered to have demonstrated human-level intelligence. Turing did not specify many key details, such as the duration of the interrogation and the sophistication of the human judge and foils.
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