Figure 4.

Montage of individual participants' R₁ maps, with values sampled halfway through cortex and projected onto the inflated surface of temporal and frontal lobes. As shown in the color bars, the range of projected R₁ values is constant over participants, with the color scale slope adjusted slightly to show individual patterns of myelination. Keyhole-shaped regional increases in R₁ oriented posteromedially to anterolaterally across Heschl's gyrus were observed in all hemispheres (medial-most aspect indicated by arrowhead) except the left hemisphere of participant S4 (marked with black diamond shape). R₁ maxima are also observed along the pre- and post-central gyri within strongly myelinated presumptive primary motor and somatosensory regions. S. Circular S, superior circular sulcus of the insula; Cent S, central sulcus; Heschl's G, Heschl's gyrus.