Fig. 2.

Para-midline sagittal sections, after optimised spatial normalization, of the fMRI mean image of 4 subjects (one per row) to illustrate noise and variable signal dropout. Columns from left are for x = −20, −12, −8, −4, 0 mm relative to midline. One of each bilateral ROI (left side) and the midline dorsal Raphe ROI are labelled in the top row (hippo: hippocampus subiculum, Culm: culmen, CnF: cuneiform nucleus, Mdul: rostral medulla, iLam: thalamus intralaminar nucleus, DoRph: dorsal Raphe nucleus). The edge voxels are within the ROI. Note on the midline at right, the variable distortion / signal loss on the ventral surface of the brainstem while the dorsal surface is relatively well-preserved. Note also signal dropout near the hypothalamus.