[1] Univ Leipzig, Inst Psychol 1, D-04103 Leipzig, Germany
[2] Dentin Inst, Private Clin Dent & Aesthet, Garmisch Partenkirchen, Germany
[3] Univ Jyvaskyla, Finnish Ctr Excellence Interdisciplinary Mus Res, Jyvaskyla, Finland
[4] Univ Helsinki, Dept Psychol, Cognit Brain Res Unit, SF-00100 Helsinki, Finland