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Yamada, M. & Akahori, K. (2006). Do Image and Voice in Synchronous CMC Help to Raise Consciousness of Learning Objectives? From the Perspectives of Social Presence and Learning Context. In E. Pearson & P. Bohman (Eds.), Proceedings of ED-MEDIA 2006--World Conference on Educational Multimedia, Hypermedia & Telecommunications (pp. 468-475). Orlando, FL USA: Association for the Advancement of Computing in Education (AACE).