Hi Peter,

Ok, the parameters I used for clusterize option on afni gui is:
p =.0099, t=2.924, NN level=2, Voxel = 33,
input file: Conjunctiontemp_CR12FA56_and_CR12HiConfiProportionalHit_17Subjects_3x3_2only_ExclusivelyMasked_wTvaluetemp_Wholebrain+tlrc

The commands I used for 3dmerge is below. Note that our resolution is 3x3x3, so the voxel size is 33x(3x3x3)=891 mm3. The rmm for the 3dmerge should be 4.23, but it somehow was slightly off with the results from the clusterize option in previous analysis, so we raised it to 4.3 and it worked for other analyses. The problem with this current analyses is that the clusterize option identifies two clusters, one with 47 voxels and the other with 45 voxels. The 3dmerge produces only 1 cluster, with 37 voxels.

3dmerge -1clust_order 4.3 891 -1tindex 1 -1thresh 2.924 -prefix Conjunctiontemp_CR12FA56_and_CR12HiConfiProportionalHit_17Subjects_3x3_2only_ExclusivelyMasked_wTvaluetemp_Wholebrain_clust01 Conjunctiontemp_CR12FA56_and_CR12HiConfiProportionalHit_17Subjects_3x3_2only_ExclusivelyMasked_wTvaluetemp_Wholebrain+tlrc

If you want, I can send you the file for testing. Thanks for your help!

Best,
Marina