The version 4 method smooths 3D in the volume, so you run the risk of smoothing across sulci before you sample on the surface. Otherwise, it's going to be pretty similar. When you look at your results, check to see whether some activation spots look like they could be bridging a sulcus. If not, I don't think you need to re-run.

doug

Chindhuri Selvadurai wrote:

Hello,

We have a question about preprocessing in fs4 compared to fs5. We used the preproc-sess command without specifying -surface or volume and did all our processing and analysis in fs5. I believe in fs4 you didn't have to specify this.

Do you think this is a problem for doing both surface and volume based analyses? Do you think it wise to redo the preprocessing?

Let us know if you need more info.

Subjects dir: /cluster/manoach/milton/subjects Command used: preproc-sess -s "$subject" -d /cluster/manoach/milton/subjects/ -per-run -fwhm 8

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