hi Gang (and other AFNI folk)

I have been using 3dMEMA and think it's terrific, so thanks. However, I have a question about the option of outputting t or z-stats. I was under the impression that this would be similar to 3dmerge -1zscore, in that it would be a simple conversion that would not change the results of the anaysis with respect to what voxels were declared active at a given p-value, but this does not appear to be the case.

I have run the same R script and only changed the option for t or z, and I get significantly different patterns in the results of each (specifically, the active voxels in the z-stat condition are a small subset of those in the t-stat condition at the same p-value threshold).

I feel I must certainly be missing something obvious--please advise?

thanks!

James