I have a question concerning the analysis I want to perform on my data and I could not find an answer appropriate in my exact situation .
My task have two conditions that were performed during one scanning run (low memory and high memory requirements) , and I would like to get activation map representing “union” of these two conditions on group level(in opposition to conjunction which I calculated using easy_conj_thresh script).
I was thinking about doing and F test on simple effects calculated for every condition but after checking the idea with FSL GLM wiki (F-test entry) I found that this approach is suitable for inter-group differences, and also is not suitable in case of repeated measures.
Therefore my question is whether there is a valid way of constructing such an F-test/other approach? Of course in worst case scenario I can calculate mean effect of both conditions but I am more interested in “union” of both activation maps.