1. School of Psychology, University of Wollongong, Wollongong, New South Wales 2522, Australia
2. Institute of Cognitive Neuroscience, University College London, 17 Queen Square, London WC1N 3AR, UK
3. Wellcome Trust Centre for Neuroimaging, University College London, 12 Queen Square, London WC1N 3BG 10003, UK
4. Interacting Minds Project, Institute of Anthropology, Archaeology and Linguistics, Aarhus University, Aarhus University Hospital, Norrebrogade 44, Building 10 G, 8000 Aarhus C, Denmark
5. Centre of Functionally Integrative Neuroscience, Aarhus University Hospital, Norrebrogade 44, Building 10 G, 8000 Aarhus C, Denmark
6. School of Psychology, University of Sydney, Sydney, New South Wales 2006, Australia