1. School of Psychology and Neuroscience, University of St Andrews, St Mary's Quad, South Street, St Andrews, Fife KY16 9JP, UK
2. Currently at: School of Psychology, University of Lincoln, Brayford Pool, Lincon LN1 3TS, UK
3. Delft University of Technology, Faculty of Electrical Engineering, Mathematics, and Computer Science, Interactive Intelligence Group, Mekelweg 4, 2628 CD Delft, the Netherlands