 In a now famous paper published in 1950 Alan Turing proposed the possibility that machines might one day have the ability to "think".As a thought experiment for what might define the concept of thought in machines, he proposed an "imitation test" in which a human subject has two text-only conversations, one with a fellow human and another with a machine attempting to respond like a human.Turing proposes that if the subject cannot tell the difference between the human and the machine, it may be concluded that the machine is capable of thought.