1. Turku PET Centre, University of Turku, 20520 Turku, Finland
2. Department of Neuroscience and Biomedical Engineering (NBE), Aalto University, 00076 AALTO, Espoo, Finland
3. Independent Max Planck Research Group for Social Neuroscience, Max Planck Institute of Psychiatry, 80804 Munich, Germany
4. Department of Endocrinology, Turku University Hospital, 20521 Turku, Finland
5. Department of Art, Aalto University, 00076 AALTO, Helsinki, Finland
6. Department of Psychology, University of Turku, 20014 Turku, Finland