Weizenbaum's ELIZA program simulated a 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:
Patient: I just feel like jumping off the roof. Doctor: Tell me more about the roof.
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