Title: The representation of subordinate shape similarity in human occipitotemporal cortex
Authors: Panis, Sven ×
Vangeneugden, Joris
Op de Beeck, Hans
Wagemans, Johan #
Issue Date: 2008
Publisher: Scholar One, Inc.
Series Title: Journal of vision vol:8 issue:10):9 pages:1-15
Abstract: We investigated the coding of subordinate shape similarity in human object-selective cortex in two event-related functional magnetic resonance adaptation (fMR-A) experiments. Previous studies using faces have concluded that there is a narrow tuning of neuronal populations selective to each face, and that tuning is relative to the expected ‘average’ face (norm-based encoding).
Here we investigated these issues using outlines of animals and tools occupying a particular position on different morphing sequences per category. In a first experiment, we inferred the width of neural tuning to exemplars by examining whether the release from adaptation with increasing shape changes between two stimuli asymptotes. In a second experiment, we compared the response to central and extreme positions in shape-space while controlling for the number of presentations of each unique stimulus, to study whether the expected ‘average’ category exemplar plays a role.
The current fMR-A results showed that a small change in exemplar shape produces a large release of adaptation, but only for outline shape changes of animals compared to man-made tools. Furthermore, our results suggested that central and extreme positions were not treated differently. Together, these results suggest a narrow tuning in object-selective cortex for individual exemplars from natural object categories, consistent with an exemplar-based encoding principle.
ISSN: 1534-7362
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Laboratory for Experimental Psychology
Research Group Neurophysiology
× corresponding author
# (joint) last author

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