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  Spatial frequency processing in scene-selective cortical regions

Kauffmann, L., Ramanoël, S., Guyader, N., Chauvin, A., & Peyrin, C. (2015). Spatial frequency processing in scene-selective cortical regions. NeuroImage, 112, 86-95. doi:10.1016/j.neuroimage.2015.02.058.

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Kauffmann, Louise1, 2, Author              
Ramanoël, Stephen1, 2, 3, Author
Guyader, Nathalie4, Author
Chauvin, Alan1, 2, Author
Peyrin, Carole1, 2, Author
Affiliations:
1Université Grenoble Alpes, France, ou_persistent22              
2Centre national de la recherche scientifique, Université Grenoble Alpes, France, ou_persistent22              
3Institut national de la santé et de la recherche médicale, Université Grenoble Alpes, France, ou_persistent22              
4Gipsa-lab, Université Grenoble Alpes, France, ou_persistent22              

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Free keywords: Spatial frequencies; Root mean square contrast; Parahippocampal place area; Retrosplenial cortex; Occipital place area
 Abstract: Visual analysis begins with the parallel extraction of different attributes at different spatial frequencies. Low spatial frequencies (LSF) convey coarse information and are characterized by high luminance contrast, while high spatial frequencies (HSF) convey fine details and are characterized by low luminance contrast. In the present fMRI study, we examined how scene-selective regions - the parahippocampal place area (PPA), the retrosplenial cortex (RSC) and the occipital place area (OPA) - responded to spatial frequencies when contrast was either equalized or not equalized across spatial frequencies. Participants performed a categorization task on LSF, HSF and non-filtered scenes belonging to two different categories (indoors and outdoors). We either left contrast across scenes untouched, or equalized it using a root-mean-square contrast normalization. We found that when contrast remained unmodified, LSF and NF scenes elicited greater activation than HSF scenes in the PPA. However, when contrast was equalized across spatial frequencies, the PPA was selective to HFS. This suggests that PPA activity relies on an interaction between spatial frequency and contrast in scenes. In the RSC, LSF and NF elicited greater response than HSF scenes when contrast was not modified, while no effect of spatial frequencies appeared when contrast was equalized across filtered scenes, suggesting that the RSC is sensitive to high-contrast information. Finally, we observed selective activation of the OPA in response to HSF, irrespective of contrast manipulation. These results provide new insights into how scene-selective areas operate during scene processing.

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Language(s): eng - English
 Dates: 2015-02-262015-03-062015-05-15
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.neuroimage.2015.02.058
BibTex Citekey: Kauffmann2015
PMID: 25754068
Other: Epub 2015
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Title: NeuroImage
Source Genre: Journal
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Pages: - Volume / Issue: 112 Sequence Number: - Start / End Page: 86 - 95 Identifier: ISSN: 1053-8119
CoNE: https://pure.mpg.de/cone/journals/resource/954922650166