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For its aliens, “Avatar” will present characters designed on the computer, but played by human actors. Their bodies will be filmed using the latest evolution of motion-capture technology — markers placed on the actor and tracked by a camera — while the facial expressions will be tracked by tiny cameras on headsets that will record their performances to insert them into a virtual world.

intelligent or affective tutoring system that can adapt its response to the emotional state of people by interaction through a computer system

software systems would significantly improve performance if they could adapt to the emotions of the user