Confirmation of units for cosmo spherical neighborhood

[Flo Martinez Addiego]

Hello,

I hope you all are doing well.

I was reading through the documentation for cosmo spherical neighborhood and I think I confused myself about the units, and I just want to be certain I understand properly.

"'radius', r } either use a radius of r, or select 

% 'count', c } approximately c voxels per searchlight 

% Notes: % - These two options are mutually exclusive % - When using this option for an fmri dataset, the % radius r is expressed in voxel units; for an meeg % source dataset, the radius r is in whatever units % the source dataset uses for the positions

When I use the 'radius' option for fmri data, the radius is in mm right? As in, if I choose a radius of 5 for fmri searchlight, it would be 5mm?

Thanks kindly,

Flo

[jvschw...@gmail.com]

Dear Flo

for fMRI the radius is in voxel units. Suppose your voxel size is 3x3x3 mm, a radius of 5 (voxels) corresponds to a radius of 15mm. 

Best

Jens

On 3. Apr 2025, at 18:40, Flo Martinez Addiego <fa...@georgetown.edu> wrote:

Hello,

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