Hi Desmond,
If you only want the positive direction of the one-sample t-test, you need to supply the "-t design.con" file containing that contrast (it's currently missing from your command line). The same file can contain the negative contrast).
If both design matrix (-d) and contrast (-t) are omitted, then it will automatically create design and both positive and negative contrasts for a one-sample t-test.
Also, unrelated: 10000 permutations with TFCE and NPC will be slow. Consider using fewer permutations and using the tail approximation. That is, use the options "-n 500 -approx tail -nouncorrected".
Also, consider using -logp, as the results are easier to read, with the figures generated lated having good contrast.
Hope this helps!
All the best,
Anderson
