1. Laboratory of Psychophysics, Brain Mind Institute, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
2. Cito Institute for Educational Measurement, Arnhem, The Netherlands
3. Institute of Cognitive Neurosciences, Free University of Tbilisi, and Laboratory of Vision Physiology, Ivane Beritashvili Center of Experimental Biomedicine, Tbilisi, Georgia