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  The Effect of image scrambling on visual cortical BOLD activity in the anesthetized monkey

Rainer, G., Augath, M., Trinath, T., & Logothetis, N. (2002). The Effect of image scrambling on visual cortical BOLD activity in the anesthetized monkey. NeuroImage, 16(3 Part A), 607-616. doi:10.1006/nimg.2002.1086.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-DF84-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-8366-4
Genre: Journal Article

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 Creators:
Rainer, G1, 2, Author              
Augath, M1, 2, Author              
Trinath, T1, 2, Author              
Logothetis, NK1, 2, Author              
Affiliations:
1Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497798              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

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 Abstract: We have investigated BOLD signal changes associated with scrambling natural images into different numbers of segments in visually modulated regions of the macaque monkey (macacca mulatta) brain. For 10° × 10° images, we observed that BOLDactivity in primary visual cortex (V1) increased with scrambling, and then dramatically dropped for very highly scrambled images (128 × 128 segments). In extrastriate visual areas, BOLD signal levels did not distinguish between natural images and scrambled images, except that as in V1 very highly scrambled images led to a drop in BOLDactivity. Finally in the superior temporal sulcus region and inferior temporal cortex, BOLDactivity decreased systematically with scrambling. Our results are consistent with the view that the BOLD signal might reflect average activation of local orienation detectors in V1, and sensitivity to more global object representations in higher visual areas. In addition, we quantify the effects of scrambling on the Fourier amplitude spectrum of the images. This analysis shows that scrambling causes substantial changes to the spatial frequency content of images. This suggests that low-level accounts for reduced BOLD activation in higher visual areas cannot be completely ruled out based on scrambling data.

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 Dates: 2002-07
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: DOI: 10.1006/nimg.2002.1086
BibTex Citekey: 849
 Degree: -

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Title: NeuroImage
Source Genre: Journal
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Publ. Info: Orlando, FL : Academic Press
Pages: - Volume / Issue: 16 (3 Part A) Sequence Number: - Start / End Page: 607 - 616 Identifier: ISSN: 1053-8119
CoNE: https://pure.mpg.de/cone/journals/resource/954922650166