Figure 3.

Cross-validated probabilistic maps of cytoarchitectonic areas. (A) Probabilistic maps of cytoarchitectonic areas on the Freesurfer (FS) average cortical surface. Colors indicate the proportion of overlapping subjects at each point on the cortical surface. Black outline: mid-fusiform sulcus (MFS). The arrangement of the probabilistic cROIs on the FS average cortical surface maintains the relation to the cortical folding as seen in individual subjects. Specifically, the MFS serves as the boundary between the probabilistic map of FG1 and FG2 (Weiner et al. 2014) and the boundary between probabilistic map of FG3 and FG4 (Lorenz et al. 2015). Top: FG4 and FG3. Bottom: FG2 and FG1. (B) Exhaustive, leave-one-out cross-validation of group probability maps for each cROI. Each map was generated with 9 subjects. Then, we evaluated how well this map predicted the left-out subject using the dice coefficient. This process was done 10 times for each left-out subject. Across FG1–FG4, the best dice coefficient was obtained at thresholds of 0.3–0.4. Thus, for subsequent analyses, we used the 0.3 threshold. Line: mean dice coefficient. Shaded area: standard error of the mean. Top: FG4 and FG3. Bottom: FG2 and FG1. Direct comparison of the MPMs of these cROIs across hemispheres is illustrated in Supplementary Figure 1.