Title: The role of experience for norm-based object encoding in human object-selective cortex
Authors: Op de Beeck, Hans
Panis, Sven
Wagemans, Johan #
Issue Date: 2009
Publisher: Pion Ltd.
Host Document: Perception vol:38 issue:Suppl. pages:164-164
Conference: European Conference on Visual Perception edition:32 location:Regensburg, Germany date:24-29 August 2009
Abstract: Faces and objects from other classes are often encoded in terms of their deviation from a class prototype or norm. An important piece of evidence is a smaller neural population response for this prototype compared to non-prototype objects. We hypothesized that these effects might be modulated or even induced by visual experience. We tested this hypothesis with functional magnetic resonance imaging (fMRI) in human subjects using novel object classes organized around a class prototype. The object distribution within a class was changed across subjects so that the class prototype in one subject was a non-prototype in another subject. This design allowed us to look for effects of experience and stimulus distribution independently from other factors that might affect response strength to individual stimuli. The fMRI scans were preceded by two training sessions with the same stimulus distribution. We found evidence for norm-based object encoding at the behavioral level through behavioral asymmetries during a stimulus comparison task. Likewise, class prototypes were associated with a smaller response in object-selective brain regions compared to non-prototype class exemplars. These findings support the hypothesis that learning is an important factor for the induction of a norm-based encoding scheme for within-class object differences.
Publication status: published
KU Leuven publication type: IMa
Appears in Collections:Laboratory for Biological Psychology
Laboratory for Experimental Psychology
# (joint) last author

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