Laboratory of Psychophysics, Brain Mind Institute, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.|Laboratory of Psychophysics, Brain Mind Institute, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.|Department of Brain and Cognitive Sciences, Computer Science and Artificial Intelligence Laboratory, MIT, Cambridge, MA, United States of America.|Department of Psychological Sciences, Purdue University, West Lafayette, IN, United States of America.|Laboratory of Computational Vision, Psychology Department, Bilkent University, Ankara, Turkey.|Laboratory of Psychophysics, Brain Mind Institute, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.