Figure 3.

Examples of manually defined boundaries (black lines) compared with atlas-based boundaries (white lines). The figure shows flattened sphere representations of 2 example subjects. The top two hemispheres represent an example of marked discrepancy between the manual definition and Wang atlas, especially in the dorsal regions of V1-V3. The bottom two hemispheres represent a subject with substantial agreement between the manual definition and Wang atlas definition of V1v/d, V2v/d, V3v/d. The manually defined boundaries have the advantage of more closely capturing individual differences in retinotopy, as well as parcellating each area into multiple eccentricity sectors. Our manual definitions extend from 0° to 7°, while the Wang atlas's most foveal and eccentric boundaries differ.