I don't know that that is actually possible in tksurfer. You can go into the fsfast directory and invert the sign by running

mris_calc -o sig.neg.nii sig.nii mul -1

then load sig.neg.nii in tksurfer, then invert and truncate.

doug

Balaji Goparaju wrote:

Hello,

I have a loaded a significance map using the tksurfer-sess command. I want to visualize only the negative activation on the surface.

In the View -> Configure -> Overlay window, I check both the "truncate" and "inverse" buttons. So only the negative activation is shown however it is in Red-Orange-Yellow color scale. How can I get this negative activation to be represented by Dark and Light Blue color scale.

Thanks in advance for the help!

Balaji Goparaju

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