C. W. Anderson, Strategic teaching in science In Strategic teaching and learning: Cognitive instruction in the content Areas, 1987.

R. Anderson, R. Anderson, P. Davis, N. Linnell, C. Prince et al., Classroom Presenter: Enhancing Interactive Education with Digital Ink, Computer, vol.40, issue.9, pp.56-61, 2007.
DOI : 10.1109/MC.2007.307

R. Baecker, D. Fono, B. Lillian, C. , and C. , Webcasting Made Interactive: Persistent Chat for Text Dialogue During and About Learning Events, Proceedings of the 2007 conference on Human interface: Part II, 2007.
DOI : 10.1007/978-3-540-73354-6_29

URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=

T. Bergstrom and K. Karahalios, Seeing More: Visualizing Audio Cues, Proceedings of Interact, 2007.
DOI : 10.1109/HICSS.1999.772675

URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=

T. Bergstrom, K. Karahalios, B. Vote, and . Heard, Adding Back-Channel Cues to Social Mirrors, Proceedings of Interact, 2009.
DOI : 10.1007/978-3-642-03655-2_61

URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=

J. Brown, A. M. Collins, and P. Duguid, Situated cognition and the culture of learning, 1989.

R. I. Dunbar, N. D. Duncan, N. , and D. , Size and structure of freelyforming conversational groups, Human Nature, vol.6, issue.1, 1995.
DOI : 10.1007/bf02734136

URL : http://www.springer.com/cda/content/document/cda_downloaddocument/Disclosure+of+Interest+Form_12110.pdf?SGWID=0-0-45-1160637-p173732517

M. Ebner and W. Reinhardt, Social networking in scientific conferences -Twitter as tool for strengthen a scientific community, Proceedings of the 5th EduMedia Conference, 2009.

J. L. Fitch, Student feedback in the college classroom: A technology solution. Educational Technology Research and Development, pp.71-77, 2004.

D. Harry, J. Green, J. Donath, and . Backchan, nl: integrating backchannels in physical space, Proc. of CHI, 2009.

M. G. Jones and T. M. Gerig, Silent Sixth-Grade Students: Characteristics, Achievement, and Teacher Expectations. The Elementary School Journal, p.95, 21994.
DOI : 10.1086/461797

K. Karahalios and T. Bergstrom, Social Mirrors as Social Signals: Transforming Audio into Graphics, IEEE Computer Graphics and Applications, vol.29, issue.5, pp.22-32, 2009.

R. H. Kay and A. Lesage, Examining the benefits and challenges of using audience response systems: A review of the literature, Computers & Education, vol.53, issue.3, pp.819-827, 2009.
DOI : 10.1016/j.compedu.2009.05.001

R. M. Krauss, C. M. Garlock, P. D. Bricker, and L. Mcmahon, The role of audible and visible back-channel responses in interpersonal communication., Journal of Personality and Social Psychology, vol.35, issue.7, pp.523-529, 1977.
DOI : 10.1037/0022-3514.35.7.523

J. F. Mccarthy, Digital backchannels in shared physical spaces: experiences at an academic conference CHI '05: CHI '05 extended abstracts on Human factors in computing systems, pp.1641-1644, 2005.

C. D. Parks and A. B. Stone, The desire to expel unselfish members from the group., Journal of Personality and Social Psychology, vol.99, issue.2, pp.303-310, 2010.
DOI : 10.1037/a0018403

D. A. Shamma, L. Kennedy, C. , and E. F. , Tweet the debates, Proceedings of the first SIGMM workshop on Social media, WSM '09, pp.3-10, 2009.
DOI : 10.1145/1631144.1631148

J. R. Stowell and J. M. Nelson, Benefits of Electronic Audience Response Systems on Student Participation, Learning, and Emotion, Teaching of Psychology, vol.37, issue.4, pp.253-258, 2007.
DOI : 10.1207/S15326985EP3702_4

T. Vandegrift, S. A. Wolfman, K. Yasuhara, A. , and R. J. , Promoting Interaction in Large Classes with a Computer-Mediated Feedback System, 2002.

E. Von-glasersfeld, Cognition, Construction of Knowledge, and Teaching, History, Philosophy , and Science Teaching, vol.80, issue.1, pp.121-140, 1989.

R. R. Weaver and J. Qi, Classroom Organization and Participation: College Students' Perceptions, The Journal of Higher Education, vol.5, issue.5, pp.570-601, 2005.
DOI : 10.1080/00221546.1997.11779003

S. Yardi, Whispers in the Classroom, Digital Youth, Innovation, and the Unexpected, 2008.