期刊
NEURON
卷 51, 期 5, 页码 661-670出版社
CELL PRESS
DOI: 10.1016/j.neuron.2006.07.021
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资金
- NCRR NIH HHS [P41 RR 14075] Funding Source: Medline
- NEI NIH HHS [R01 EY017081] Funding Source: Medline
- NIBIB NIH HHS [EB 00790] Funding Source: Medline
- NIMH NIH HHS [MH 67529] Funding Source: Medline
It is generally assumed that sensitivity to different stimulus orientations is mapped in a globally equivalent fashion across primate visual cortex, at a spatial scale larger than that of orientation columns. However, some evidence predicts instead that radial orientations should produce higher activity than other orientations, throughout visual cortex. Here, this radial orientation bias was robustly confirmed using (1) human psychophysics, plus fMRI in (2) humans and (3) behaving monkeys. In visual cortex, fMRI activity was at least 20% higher in the retinotopic representations of polar angle which corresponded to the radial stimulus orientations (relative to tangential). In a global demonstration of this, we activated complementary retinotopic quadrants of visual cortex by simply changing stimulus orientation, without changing stimulus location in the visual field. This evidence reveals a neural link between orientation sensitivity and the cortical retinotopy, which have previously been considered independent.
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