Figure 1.
Regions of interest. Top, Three-dimensional rendering of the starling brain. The right hemisphere is a surface rendering of the telencephalon (pink), the cerebellum (blue, Cb), and the Optic chiasm (orange, CO). The left hemisphere is a transparent mirror image of the right hemisphere with horizontal and coronal FA maps projected into it. Middle, Two sagittal color coded FA maps (right is caudal) of one male starling in the breeding season. The colors define the main diffusion direction in each voxel (red: rostral–caudal; green: dorsal–ventral; blue: medial–lateral). The insets show Area X and RA respectively of the same subject at the two different seasons. Bottom, Representative slices of FA-maps on which the regions of interest (insets) are depicted. A, POA and VMN of the SBN. B, BNST of the SBN. C, Auditory region NCM. Regions of interest expand more than the depicted slices; see Materials and Methods for more detailed information. Cb, Cerebellum; CoA, commissura anterior; CO, optic chiasm; Field L, used as proper name; LFM, lamina frontalis suprema; LFS, lamina frontalis superior; LPS, lamina pallio-subpallialis; LaM, lamina mesopallialis; X, Area X.