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Simple Language Processing: ELIZA

Weizenbaum's ELIZA program simulated a Rogerian psychotherapist; it achieved surprisingly good performance simply by matching the ``patient's'' input to patterns:


Pattern:   (I HAVE BEEN FEELING *)
Response:  (WHY DO YOU THINK YOU
             HAVE BEEN FEELING *)
The * matches anything; it is repeated in the answer.

Patient: I have been feeling depressed
           today.
Doctor:  Why do you think you have been
           feeling depressed today?
Problems: