| We try to show here how the structure of conversations can be explained by taking into account the logical knowledge that the speakers must possess to perform their replies. This study starts with the careful examination of observed excerpts taken from recorded spontaneous conversations. Next we express the minimal knowledge of each speaker by means of a special logical representation (modalities and paradoxical clauses). The PARADISE program is then able to reconstruct the dynamic chaining of replies from this static knowledge. The capabilities of PARADISE allow us to make three points. First they legitimize the use of logic and present it as an essential tool for spontaneous human speech analysis. Second, the strategies used by PARADISE give some indication of the unconscious strategies used by human speakers. And third, we mention how these results could lead to significant improvements of man-machine interface in knowledge-based systems. |
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