Visualization. Left. Functional and structural volume data shown in the Slice Viewport, which displays three orthogonal slices. fMRI (warm colors), and 2 related source localized EEG volumes (green and magenta) are simultaneously shown superimposed on the structural MRI. Right. The same data shown in the Surface viewport. In this case the fMRI is shown as red iso-surfaces and the EEG data are shown with a cutaway view.