V. Vávrová, P. Červenka Faculty of Electrical Engineering, ČVUT Prague, Czech Republic, E. Weiss Faculty BERG, Technical University Košice, Slovakia, V. Ferencz, J. Naščáková Faculty of Business Economics, Košice, University of Economics, Bratislava, Slovakia The article describes the possibilities of using the pupillary light refl ex for subconscious ascertainment of consumer preferences also ...