Hi Cate,
While I do not have too much experience with ETAC numbers, those seem reasonable, with the only concern coming around the small clusters. You can check the single subject results in those areas to be sure the results are pretty consistent. But since this is based on permutation testing and not a minimum global cluster size, it is certainly feasible to get smaller clusters.
If you evaluate those small regions across subjects, do the results seem consistent?
- rick