1. Institute of Education Research and Teacher Education, University of Graz, 8010 Graz, Austria
2. Institute of Psychology, University of Graz, 8010 Graz, Austria
3. Practical Education and Action Research, University College of Teacher Education Styria, 8010 Graz, Austria
4. Division of Physiology, Otto Loewi Research Center, Medical University of Graz, 8010 Graz, Austria