1. Turku PET Centre, University of Turku, Turku, Finland
2. Department of Psychology, University of Turku, Turku, Finland
3. National Defence University, Helsinki, Finland
4. Department of Neuroscience and Biomedical Engineering, School of Science, Aalto University, Espoo, Finland
5. Advanced Magnetic Imaging Centre, Aalto Neuroimaging, School of Science, Aalto University, Espoo, Finland