Dialogue and Instruction: Modelling Interaction in Intelligent Tutoring Systems ; [proceedings of the NATO Advanced Research Workshop on Natural Dialogue and Interactive Student Modelling, Held in Varenna, Italy, October 17 - 20, 1992]
... user's side of the dialogue may consist almost entirely of pointing ... illusion of manipulating real objects still fur- ther . By coupling a the motion of ... a reduction of cognitive distance , the mental effort needed to 290 R.J.K. Jacob.
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