Reflect Table

A group mirror for conversations

Reflect is an interactive meeting table that monitors the conversation taking place around it via a thee-microphone beamforming array, and uses a matrix of 8×16 multi-color LEDs to display information in different forms. We studied two versions of the table. The first shows the amount of speech of each participant, and our studies showed that, under certain conditions, participants become more balanced in terms of how much they speak when their participation levels are displayed on the surface of the table. This is beneficial for certain situations where balance in participation is necessary for good collaboration to take place, such as situations of collaborative learning where all learners need to participate more or less equally to improve learning gains for the group.

The Reflect table

The Reflect table displaying amount of speech as territories of color LEDs in front of each speaker.

The other version of the table uses prosodic analysis of participants’ voices to determine which participants are more or less interested in the collaboration by measuring what we call vocal arousal of emotion (which is a measure of how vocally active the person is). This is measured through four prosodic features: pitch, pitch variance, intensity and speech rate.
Another experiment conducted with the table showing levels of vocal arousal showed us that the display has different effects on male and female subjects. Male subjects increased their vocal arousal when it was displayed on the table, but female subjects did not.
The Reflect table is capable of showing different types of visualizations.
We also tested the table outside the laboratory as a tool for communication training. It is now in use at the Centre d’Education Permanante pour la Fonction Publique in Lausanne, and trainers collaborating with the center are working on new ways of conducting role-playing and other activities for communication training courses that benefit from the use of this table.


Augmenting Face-to-Face Collaboration with Low-Resolution Semi-Ambient Feedback

K. Bachour / P. Dillenbourg; F. Kaplan (Dir.)

Lausanne, EPFL, 2010.

DOI : 10.5075/epfl-thesis-4895.

An Interactive Table for Supporting Participation Balance in Face-to-Face Collaborative Learning

K. Bachour; F. Kaplan; P. Dillenbourg

IEEE Transactions on Learning Technologies. 2010.

DOI : 10.1109/TLT.2010.18.

Low-Resolution Ambient Awareness Tools for Educational Support

K. Bachour; H. Seiied Alavi; F. Kaplan; P. Dillenbourg

CHI 2010 Workshop: The Future of HCI And Education, Atlanta, Georgia, USA, April 11, 2010.

Interpersonal Computers for Higher Education

F. Kaplan; S. Do-Lenh; K. Bachour; G. Y. Kao; C. Gault et al.

Interactive Artifacts and Furniture Supporting Collaborative Work and Learning; Springer US, 2009. p. 129-145.

Reflect : An Interactive Table for Regulating Face-to-Face Collaborative Learning

K. Bachour; F. Kaplan; P. Dillenbourg

Times of Convergence: Technologies Across Learning Contexts; Berlin / Heidelberg: Springer, 2008. p. 39-48.

A tabletop display for self-regulation in face-to-face Meetings

K. Bachour; F. Kaplan; P. Dillenbourg

IEEE TABLETOP 2007, Portland, RHODE ISLAND, USA, October 2007.

New Publications

F. Roman; S. Mastrogiacomo; D. Mlotkowski; F. Kaplan; P. Dillenbourg : Can a Table Regulate Participation in Top Level Managers' Meetings?. 2012. International Conference on Supporting Group Work GROUP'12, Sanibel, Florida, USA, October 27-31, 2012.
F. Roman; O. Mubin; P. Dillenbourg : ReflectWorld: A Distributed Architecture for Meetings and Groups Evolution Analysis. 2012. The 2012 International Conference on Collaboration Technologies and Systems, Denver, Colorado, USA, May 21-25, 2012. p. 389-396.