Figure 2.

Cross-subject surface average relaxation rate (R₁) test/retest. Top left inset redrawn from Flechsig (1920) shows early myelinating areas in gray. Rows 1–6 show spherical morph cross-subject average ΔR₁ (difference above mean) projected back onto the gray–white, pial, and inflated surfaces of 1 subject. R₁ values in each subject were sampled at a point halfway between the individual's gray–white matter and pial surfaces. Row 3 shows the data before removing variance due to local cortical curvature; that variance is removed in all other rows. Rows 5 and 6 show excellent scan/rescan reliability of average. Lower middle inset shows same magnification lateral occipital cutout with individual subjects' R₁ maxima (yellow contours), superimposed on MT postmortem probability map in purple (Malikovic et al. 2007; Fischl et al. 2008), showing that the individual and average R₁ maxima differ subtly from the postmortem map. See text for midline and anterior insula mask.