Figure 6.

Average polar angle data. 3T average phase-encoded polar angle maps (n = 22 subjects) rendered on close-up views of the inflated left (LH) and right (RH) cortical hemispheres are shown. Here, polar angle maps show the average of 2–12 scans acquired over one to three sessions. Also in the average map, CCW and CW polar angle scans were combined in each subject to cancel hemodynamic delay differences among areas. Dashed yellow ellipsoids indicate the position of the human area V6. Also in the average map, the presence of an extra upper-field representation on the medial wall is clearly appreciable. We calculated the average retinotopy of the V6 area (average of left and right hemisphere ellipses): mean, 2.1 cm². The area of V6 estimated from the retinotopic average is likely to be a slight overestimate as a result of blurring caused by intersubject differences. Other labels and logos are as in Figure 2.