There are many video conferencing systems available today in the area of distance learning, and a teacher and students can interact not only by text but also by audio and video. Thus, the interaction between them has been improved greatly, compared with those presentation types which transmit inforamtion one way from a teacher to students. But still these systems need improvements in nonverbal aspects. Certainly motion can be transmitted, but it is very difficult for a teacher and students to share the common perspective and points of focus.
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