Those thresholds apply to both pos and neg. Eg, what you have there will show values between +0.1 and +250 AND between -0.1 and -250. It appears that you don't have any negative values in that map

On 11/22/2023 1:34 PM, Atena Akbari wrote:

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Screenshot 2023-11-22 at 1.32.53 PM.png  doesn't allow me to adjust the threshold to negative values, for example t-values between -3 and 3.

On Wed, Nov 22, 2023 at 1:26 PM Douglas N. Greve dgreve@mgh.harvard.edu wrote:

Have you tried adjusting the threshold. Open the configure overlay
option. Also, sending a pic would be helpful (and the contents of
tk.dat)

On 11/22/2023 11:29 AM, Atena Akbari wrote:

...

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Dear freesurfer team,

I want to overlay the activation map that I got from SPM on the
inflated surface. The command I use is:


"mri_vol2surf    --mov    spmT_funcmap.nii     --ref
 subj01/mri/orig.mgz.   --reg    tk.dat --hemi rh   --o   
flodername"


in which, I got the registration file (tk.dat) by aligning my
functional mean image to the orig.mgz in tkregisterfv.


now the problem is when I overlay the activation map on the
inflated surface, I can only see the voxels with positive
t-values. I can't see the negative ones. I cannot change the
threshold values provided by "configure overlay" to negative
values. Also, changing the "z-score" option next to the overlay
configuration doesn't make any difference. can you help me with
this, please?


Thanks a lot,

Atena


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