Fig. 5.
Quantification of preferred orientation. Column groups in this analysis are defined as those voxels with preferred orientations within ±15 around 0°, 45°, 90°, or 135° orientations. (a) Histograms of the number of voxels within each preferred orientation group for each subject. For both subjects, a statistically significant (Psubject1 < 0.03, Psubject2 < 0.07) larger number of voxels were tuned to 90° orientations. (b) Normalized fMRI signal amplitude changes for each group of orientations, averaged over both subjects. The error bars in a represent errors between scans within the same subject, and the asterisks represent the significance of the difference between the number of voxels at a given orientation vs. the number of voxels at 90°.