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  Contextual effects on shape processing in the human visual cortex

Altmann, C., Kourtzi, Z., Grodd, W., & Bülthoff, H. (2002). Contextual effects on shape processing in the human visual cortex. Poster presented at 25th European Conference on Visual Perception (ECVP 2002), Glasgow, UK.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-DF4C-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-97E6-D
Genre: Poster

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 Creators:
Altmann, CF1, 2, Author              
Kourtzi, Z1, 2, 3, Author              
Grodd, W, Author              
Bülthoff, HH1, 2, Author              
Affiliations:
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: The detection of visual targets against their background is critical for shape perception. The human lateral occipital complex (LOC) has been implicated in the processing of shapes. We tested whether the LOC processes information about the context (background) of shapes. We addressed this question by using event-related fMRI adaptation in which lower neural responses are observed for two identical than for two different consecutively presented stimuli. The stimuli consisted of displays with a closed target contour of collinear Gabor elements embedded into a background of randomly oriented Gabors. There were four different conditions: (i) identical image, where the two stimuli in a trial were the same; (ii) different shape, where the target shape was different; (iii) different context, where the target shape was the same but the background was different; (iv) completely different, where both the target shape and the background were different. We observed adaptation in the LOC when the target shapes were presented in the same background, but no adaptation when they were presented in different backgrounds. These findings suggest that neural populations in the LOC process information about the context of visual shapes.

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 Dates: 2002-08
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: BibTex Citekey: 1959
DOI: 10.1177/03010066020310S101
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Title: 25th European Conference on Visual Perception (ECVP 2002)
Place of Event: Glasgow, UK
Start-/End Date: 2002-08-25 - 2002-08-29

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Title: Perception
Source Genre: Journal
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Publ. Info: London : Pion Ltd.
Pages: - Volume / Issue: 31 (ECVP Abstract Supplement) Sequence Number: - Start / End Page: 91 Identifier: ISSN: 0301-0066
CoNE: https://pure.mpg.de/cone/journals/resource/954925509369