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² Color Opacity lets you select the opacity of colored voxels (those
that are above the
threshold)
åOpacity of overlaid voxels is different from the
opacity it would have from the
underlay dataset at that location
åUsually
want this to be high (0.5 or above)
åTow
special values on this menu:
Ø Underlay means that the colored voxel’s opacity will be
determined by the opacity that it
would have from the underlay image
Ø ShowThru means that colored voxels show through underlay voxels
(the ‘glass brain’
effect), no matter how opaque the underlay is
•Takes some
practice to become accustomed to this type of image
•But can be a
very useful way to see lots of activation at once:
•Seeing this animated is especially useful (but hard to
publish)
