I see Matthew addressed the question in 2010 for a different application
(https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind1008&L=fsl&D=0&P=99311)
although with setup_masks could it be that somehow
the tfce algorithm is not excluding the zeros as intended?
"On Mon, August 9, 2010 15:50, Matthew Webster wrote:
> Hello,
> The TFCE algorithm involves an integral with a step size based
> on the peak-statistic value in the first permutation. If a
> subsequent permutation has much larger statistic values than
> those in the first permutation, this integral can take an
> extremely long time to complete. It might be worth checking the
> input design for problems - as an error in the design can often
> cause this behaviour.
>
> Many Regards
>
> Matthew"
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