Hi,
I'm trying to find significantly activated clusters. According to 3dclust program help file, using "-1noneg" option is "strongly" recommended. However, I do not understand why you want to zero out voxels with negative intensities. Would you please explain why this option is recommended and in what situations it is most desirable? I've run 3dclust using with/without this option and I get exactly the same reports.
Thank you!