Topology-preserving smoothing of retinotopic maps
Fig 10
The retinotopic mapping of the V1/V2/V3 complex of the left hemisphere of the first observer: (A) the raw retinotopic map in the eccentricity-extended-polar coordinate space (with 232 flipped triangles), (B)-(E) the smoothing results of the Average (with 55 flipped triangles), Median (with 85 flipped triangles), Laplacian (with 151 flipped triangles), and the proposed smooth (no flipped triangles), respectively, (F) the entire left inflated mesh in medial view, (G) an enlarged graph of the raw retinotopic map on the inflated mesh, (H)-(K) smoothing results on the inflated surface of the four smoothing methods, in the same order of (B)-(E). In (A)-(E) the x axis is the eccentricity v(1), and the y axis is the extended polar angle v(2), in (H)-(K), the green and blue curves are levels sets, i.e., the contours of eccentricity v(1) and extended polar angle v(2), respectively.