Dear Ming-Ting,
> According to the previous discussion on the significance of averaging
> the individual Z-score images across subjects, this averaging approach
> is a simple meta-analysis which doesn't generalize to the population.
> I would like to try this approach and would like to know if anyone
> know/ has a script to do the average of several Z-score images across
> subjects.
I am afraid SPM does not support this approach. As you correctly point
out it is a rather ad hoc form of meta-analysis that has little
connection with classical inference in the context of hierarchical
models.
Having said this you could simply average the T images using 'imagcalc'.
I hope this helps - Karl
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