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Hi Wiktor,

If you were just resampling, you could multiply by a constant (in this case, the new DLH would be 8 times larger than the original). However, given that the alignment is non-linear, you'd need to take that into account. Try instead running the model again with the input data in standard space, since then the residuals will also be in standard space, and smoothest will compute the smoothness already taking that into account.

All the best,

Anderson


On 8 October 2017 at 14:07, Wiktor Olszowy <[log in to unmask]> wrote:
Dear FSL Experts,

I would like to use the 'cluster' function on zstat1 after registering zstat1 to MNI space. I understand that I have to feed the cluster function with the DLH and the VOLUME parameters, which are normally in the file feat/stats/smoothness. How should I change these values to match the new (MNI) space? is it correct to scale the two parameters given the differences in voxel sizes between native space and MNI space? if MNI voxels are 2^3 mm^3, and native space voxels are 4^3 mm^3, then I wonder if the new DLH is 8 times smaller than the DLH for native space and the new VOLUME parameter is 8 times larger? I was playing with these values, but could not get meaningful results (for smaller voxels there should be a higher number of positive voxels...)

Best wishes,

Wiktor Olszowy