1. School of Information and Communication Studies, University College Dublin, Ireland
2. School of Computer Science and Statistics, Trinity College Dublin, Ireland
3. School of Computer Science and Statistics, Trinity College, Dublin, Ireland
4. Department of Psychology, University of Edinburgh, United Kingdom
5. Division of Speech, Music and Hearing, KTH Royal Institute of Technology, Sweden
6. Department of Computer and Systems Sciences, Stockholm University, Sweden
7. IBM Research, United States