Hi Daniel,

Thanks for your reply. I found out what the problem was. I was looking into clusters using [clusterize] option while thresholding t-values which are the values of voxels. I found that the spot I was dealing with consists of two voxels: one is larger than the threshold value I set, and the other is smaller than the threshold. I realized that the threshold I set lies between intensities of two voxels. So when I set a threshold larger than the intensity of the latter, the latter voxel disappeared, and subsequently the former one disappeared too because I set '2' as a minimum cluter size that will be kept, on the [clusterize] panel. Now I see the reason.

Anyway thank you for your help in this. I appreciate it!