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  Natural vision reveals regional specialization to local motion and to contrast-invariant, global flow in the human brain.

Bartels, A., Zeki, S., & Logothetis, N. (2008). Natural vision reveals regional specialization to local motion and to contrast-invariant, global flow in the human brain. Cerebral Cortex, 18(3), 705-717. doi:10.1093/cercor/bhm107.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-CA21-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-315D-E
Genre: Journal Article

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Bartels, A1, 2, Author              
Zeki, S, 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: Visual changes in feature movies, like in real-live, can be partitioned into global flow due to self/camera motion, local/differential flow due to object motion, and residuals, for example, due to illumination changes. We correlated these measures with brain responses of human volunteers viewing movies in an fMRI scanner. Early visual areas responded only to residual changes, thus lacking responses to equally large motion-induced changes, consistent with predictive coding. Motion activated V51 (MT1), V3A, medial posterior parietal cortex (mPPC) and, weakly, lateral occipital cortex (LOC). V51 responded to local/differential motion and depended on visual contrast, whereas mPPC responded to global flow spanning the whole visual field and was contrast independent. mPPC thus codes for flow compatible with unbiased heading estimation in natural scenes and for the comparison of visual flow with nonretinal, multimodal motion cues in it or downstream. mPPC was functionally connected to anterior portions of V51, whereas laterally neighboring putative homologue of lateral intraparietal area (LIP) connected with frontal eye fields. Our results demonstrate a progression of selectivity from local and contrast-dependent motion processing in V51 toward global and contrast-independent motion processing in mPPC. The function, connectivity, and anatomical neighborhood of mPPC imply several parallels to monkey ventral intraparietal area (VIP).

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 Dates: 2008-03
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: DOI: 10.1093/cercor/bhm107
BibTex Citekey: 4494
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Title: Cerebral Cortex
Source Genre: Journal
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Publ. Info: New York, NY : Oxford University Press
Pages: - Volume / Issue: 18 (3) Sequence Number: - Start / End Page: 705 - 717 Identifier: ISSN: 1047-3211
CoNE: https://pure.mpg.de/cone/journals/resource/954925592440