Results from the whole-brain GM VBM analysis according to dimension. p < 0.05 after FWE correction. Significant regions associated with changes in GM volume related to performance in terms of RT are superimposed on a coronal (left) and sagittal (right) view. Additional slices can be found in Supplementary Figure 2. The whole-brain analyses identified a right anterior temporal region (r-ant-ATL) (in red), in which GM volume was negatively correlated with RT in the Category dimensions (same and different category tasks) and a most posterior ATL region (r-post-ATL) (in green) in which GM volume was negatively correlated with RT in the Shape (same and different shape tasks) dimensions. Shared regions are shown in yellow. Plots between performance and GM measures within these 2 regions are displayed in the partial regression diagrams: X axes represent the residual RT in each experimental dimension, and Y-axes the residual of the mean GM volume within each region. This analysis showed that the r-ant-ATL is significantly associated with Category but not Shape, while the r-post-ATL is significantly associated with Shape but not Category.