Figure 1 .

Flow diagrams of the steps in the application of the single-atlas parcellation scheme (SAPS), and two-atlas parcellation scheme (TAPS) are shown in the left and right columns, respectively, for the case of an individual in the chimpanzee cohort. For the vertex-wise analysis in SAPS (a) the interhemispheric and between-subject correspondences are established by coregistering both cerebral hemispheres of individual subjects to a symmetric registration atlas. For the corresponding vertex-wise analysis in TAPS (b) between-subject correspondences are established by separately coregistering left and right cerebral hemispheres of individual subjects to the relevant side of the atlas. For ROI-based analysis in SAPS (c) the parcellation of one cerebral hemisphere of the Desikan-Killiany atlas (e.g., left side) is first projected to both the ipsilateral and contralateral cerebral hemisphere of individual subjects. The pipeline is then repeated using the opposite side of the Desikan-Killiany atlas, and the two results are averaged. For ROI-based analysis in TAPS (d), the parcellation convention of each cerebral hemisphere in the Desikan-Killiany atlas is propagated separately to the corresponding hemisphere of individual subjects. The illustration is simplified by showing only one-half of the SAPS analysis pipeline for step-by-step comparison with TAPS.