Figure 1.

Functional field organization of the monkey auditory cortex superimposed over the frequency response areas and anatomical features of the macaque superior temporal plane. Left: a sagittal view of the macaque brain (top) with the superior temporal plane (dark gray shadings) exposed by cutting out the operculum (bottom). Right: within the superior temporal plane, the core area, highlighted with bold stroke, is surrounded by belt fields. Anatomical features are designated by light gray color shade. Main gradient directions from low to high of the frequency response areas are indicated with green arrows left of the scheme. CS, circular sulcus. Auditory field labeling according to Hackett et al. (Hackett et al., 1998; Hackett, 2011).