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V1-V3 manually defined grids. A, Schematic of the manually defined V1-V3 grids marked by 4 human anatomists: 7 iso-polar angle contours (V1m, V1d, V1v, V2d, V2v, V3d, V3v) and 5 iso-eccentricity contours (0.5°, 1°, 2°, 4°, 7°) on each hemisphere (LH depicted). B, A subject's inflated hemispheres with polar angle retinotopy (see color wheel), the manual definition of V1-V3 averaged across 4 anatomists (black grid).
