详细记录  
题名:The Radial Bias: A Different Slant on Visual Orientation Sensitivity in Human and Nonhuman Primates
作者:Yuka Sasaki,1,2,3, Reza Rajimehr,1 Byoung Woo Kim,1 Leeland B. Ekstrom,1,4 Wim Vanduffel,1,2 and Roger B.H. Tootell1,2,4
来源:Neuron, Vol 51, 661-670, 07 September 2006
URL :http://www.neuron.org/content/article/abstract?uid=PIIS0896627306005861
日期:060930
摘要:1 Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, 149 13th Street, Charlestown, Massachusetts 02129
2 Department of Radiology, Harvard Medical School, 25 Shattuck Street, Boston, Massachusetts 02115
3 ERATO Shimojo Implicit Brain Function Project, California Institute of Technology, Pasadena, California 91125
4 Health Sciences and Technology/Nuclear Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139

Corresponding author
Yuka Sasaki
yuka@nmr.mgh.harvard.edu

Summary

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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