Impaired Categorical Perception of Facial Expressions in High-Functioning Adolescents with Autism Jan-Pieter Teunisse1 and Beatrice de Gelder1,2 1Department of Psychology, University Medical Centre St. Radboud, Nijmegen, The Netherlands, 2Faculty of Social and Behavioural Sciences, Tilburg University, Tilburg, The Netherlands ABSTRACT Categorical perception of facial expressions is studied in ....