Alan Turing Quote

Source/Notes: His 1950 definition of the Turing Test. Variant: "a machine is termed capable of thinking if it can, under certain prescribed conditions, imitate a human being by answering questions sufficiently well to deceive a human questioner for a reasonable period of time." This variant is quoted in: "Automata Studies", edited by C.E. Shannon & J. McCarthy (Princeton University Press, 1956)
Source/Notes: Letter to Robin Gandy, 1954; reprinted in Andrew Hodges, Alan Turing: the Enigma (Vintage edition 1992), p. 513