Institution: | (1) Department of Psychology, University of Bielefeld, Postfach 8640, D-4800 Bielefeld 1, Federal Republic of Germany;(2) Department of Psychology, University of Leiden, Hooigracht 15, P. O. Box 9509, 2300 RA Leiden, The Netherlands;(3) Department of Experimental Psychology, University of Oxford, OX1 3UD Oxford, UK |