Even when one person is doing all the talking, a conversation is an interactive process. The listener participates through expression, posture and movement, and the speaker interprets what he sees to determine what the listener does and does not understand. Computers, however, cannot make such interpretations. Or, at least, they have not been able to do so until now. But a study by Louis-Philippe Morency of the University of Southern California and his colleagues may change that. In a recent edition of the Journal of Alternative Agent and Mulriagent Systems they demonstrated that a computer can be given the ability to understand at least one significant human gesture: the nod.
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