Hi Anderson,

Thank you for your quick answer! I understand now. 

Do you think the FWE correction could lead to some differences too since the number of voxels included are different?

Thanks!

All the best,

Giang-Chau

2016-09-28 1:51 GMT-05:00 Anderson M. Winkler <[log in to unmask]>:

Hi Giang-Chau,

The support region of the TFCE (see the original paper) depends on the size of the region one is looking at, which here depends on the FA threshold, so the results can differ.

All the best,

Anderson

On 27 September 2016 at 21:52, Giang-Chau <[log in to unmask]> wrote:

Dear FSL experts,

I have two infants DTI data set and I have run TBSS + randomise (with TFCE) analysis using different FA thresholds (0.1, 0.15, 0.2) therefore different masks.
When looking at the corrected p-value map, I have noticed that some tracts appear significantly (p<0.05) different when using a FA=0.02 but are not when using=0.1 and vice versa. Are the differences in p-value between the different thresholds resulting from the correction of the multiple comparison?

Thank you very much for your time and help!

Giang-Chau