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Representative coronal slices showing the orbitofrontal (A) and superior temporal (B) regions. The olfactory sulcus, intermediate orbital sulcus (IOS), and Heschl's sulcus on the left hemisphere are colored red. Because we traced the surface of the intrasulcal gray matter using a line 1 mm in width, the number of pixels (1.0 × 1.0 mm) in each coronal slice was equal to the sulcus depth (mm). LOS, lateral orbital sulcus; MOS, medial orbital sulcus.
