Individual morphology and relative gray matter volume of HG and PT. A, 3D reconstruction of an individual AC. HGs and its duplications are colored in blue (left hemisphere) and red (right hemisphere). B, A top view of 12 exemplary individual ACs reveals the characteristic large variability in size, gyrification, and hemispheric asymmetry of HG and PT. C, Bar graphs showing the gray matter (GM) volumes of HG, PT, and HG/PT ratio in both hemispheres for the three groups. L, Left; R, right.