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  Processing of global vs. Local shape information in the human visual cortex

Huberle, E., & Kourtzi, Z. (2013). Processing of global vs. Local shape information in the human visual cortex. Poster presented at 33rd Annual Meeting of the Society for Neuroscience (Neuroscience 2003), New Orleans, LA, USA.

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Huberle, E1, 2, Author              
Kourtzi, Z1, 2, 3, Author              
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1Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497797              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              
3Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497798              

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 Abstract: Coherent visual perception requires the integration of local elements into global shapes. However, the involvement of the various visual areas in the integration of local features into global shapes remains largely unknown. We used event-related fMRI to test for local and global shape processing in visual areas known to be involved in the processing of shapes. The stimuli consisted of images of houses or faces (global shapes) rendered by smaller images of stimuli from these categories (local shapes). We tested four conditions: a) global faces rendered by local faces; b) global faces rendered by local houses; c) global houses rendered by local faces and d) global houses rendered by local houses. Subjects were instructed to judge whether global and local shapes where from the same or different categories. We tested for responses in the Fusiform Face Area (FFA) known to respond selectively to faces (Kanwisher et al., 1997) and the Parahippocampal Place Area (PPA) known to be involved in the analysis of spatial layout (Epstein et al., 1998). Our results showed strong fMRI responses for global faces in the FFA and global houses in the PPA independent of the stimulus category at the local level. Lower category specific responses to the local shapes were observed when the global shapes were from a different category than the local shapes. These results suggest differential processing of global and local shape information in category selective areas. Further studies will test for the processing of global and local shape information at different stimulus scales.

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 Dates: 2003-11
 Publication Status: Published online
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 Identifiers: BibTex Citekey: HuberleK2003
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Title: 33rd Annual Meeting of the Society for Neuroscience (Neuroscience 2003)
Place of Event: New Orleans, LA, USA
Start-/End Date: 2013-11-08 - 2013-11-12

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Title: 33rd Annual Meeting of the Society for Neuroscience (Neuroscience 2003)
Source Genre: Proceedings
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Pages: - Volume / Issue: - Sequence Number: 819.15 Start / End Page: - Identifier: -