title: Integration or separation in the processing of facial properties--a computational view.
abstract: A face recognition system ought to read out information about the identity, facial expression and invariant properties of faces, such as sex and race. A current debate is whether separate neural units in the brain deal with these face properties individually or whether a single neural unit processes in parallel all aspects of faces. While the focus of studies has been directed toward the processing of identity and facial expression, little research exists on the processing of invariant aspects of faces. In a theoretical framework we tested whether a system can deal with identity in combination with sex, race or facial expression using the same underlying mechanism. We used dimension reduction to describe how the representational face space organizes face properties when trained on different aspects of faces. When trained to learn identities, the system not only successfully recognized identities, but also was immediately able to classify sex and race, suggesting that no additional system for the processing of invariant properties is needed. However, training on identity was insufficient for the recognition of facial expressions and vice versa. We provide a theoretical approach on the interconnection of invariant facial properties and the separation of variant and invariant facial properties.
authors.affiliation: Department of Psychology, National Taiwan University, Roosevelt Road, Taipei 106, Taiwan.|Department of Comparative Cognition, Institute of Biology, University of Neuchâtel, 2000, Rue Emile-Argand 11, Neuchâtel, Switzerland.
authors.forename: Christoph D
authors.initials: CD
authors.lastname: Dahl
authors.affiliation: State Key Laboratory of Cognitive Neuroscience and Learning and IDG/McGovern Institute for Brain Research, Beijing Normal University, Xinjiekouwai Street 19, 100875 Beijing, China.
authors.forename: Malte J
authors.initials: MJ
authors.lastname: Rasch
authors.affiliation: Max Planck Institute for Biological Cybernetics, Human Perception, Cognition and Action, Spemannstrasse 38, 72074 Tübingen, Germany.
authors.forename: Isabelle
authors.initials: I
authors.lastname: Bülthoff
authors.affiliation: Department of Psychology, National Taiwan University, Roosevelt Road, Taipei 106, Taiwan.
authors.forename: Chien-Chung
authors.initials: CC
authors.lastname: Chen
mesh_terms: D016002:Discriminant Analysis; D005149:Facial Expression; D000066499:Facial Recognition; D005260:Female; D006801:Humans; D008297:Male; D008962:Models, Theoretical
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