ELIZA is one of the early naive natural language processing programs. It is interactive, but it is not a spoken dialog system. It works by processing user responses to scripts, the best known of which is DOCTOR, a simulation of a therapist in client-centered therapy. Although it had little or no information about human thoughts and feelings, DOCTOR could engage in surprisingly human-like interactions; Joseph Weisenbaum of MIT wrote ELIZA between 1964 and 1966. It was the software from which the so-called chatbot originated. http://ja.wikipedia.org/wiki/ELIZA
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