Hi Marnie,

Thanks for the information, that helps a lot.

The difference between your results and mine was that you
gave the command with '-fwhm 5', but your results were from
using '-fwhm 6'. Now I see the same thing.

Another thing that was clarified is the size of your mask.
That looks like you did a many-step dilation in +orig space
(presumably with '3dAutomask -dilate 6' or some such). That
will hurt you in the multiple comparison correction.

I expect that your mask goes far outside the actual brain.
You would be better off applying an anatomical mask, and
using that in your AlphaSim computation.

For example afni_proc.py no longer masks the data in orig
space (unless you tell it to). For details on why, please
see the "MASKING NOTE" section of "afni_proc.py -help".

- rick