Journal
JOURNAL OF NEUROSCIENCE
Volume 31, Issue 13, Pages 4792-4804Publisher
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.5160-10.2011
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Funding
- NEI NIH HHS [R01 EY016752, R01-EY016752] Funding Source: Medline
- NINDS NIH HHS [R01-NS047493, R01 NS047493] Funding Source: Medline
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The representation of orientation in primary visual cortex (V1) has been examined at a fine spatial scale corresponding to the columnar architecture. We present functional magnetic resonance imaging (fMRI) measurements providing evidence for a topographic map of orientation preference in human V1 at a much coarser scale, in register with the angular-position component of the retinotopic map of V1. This coarse-scale orientation map provides a parsimonious explanation for why multivariate pattern analysis methods succeed in decoding stimulus orientation from fMRI measurements, challenging the widely held assumption that decoding results reflect sampling of spatial irregularities in the fine-scale columnar architecture. Decoding stimulus attributes and cognitive states from fMRI measurements has proven useful for a number of applications, but our results demonstrate that the interpretation cannot assume decoding reflects or exploits columnar organization.
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