Hi,

I need to define the common regions of activation across 4 tasks. I used the conjunction analysis to map the regions of task-realted and common activation between two tasks (thanks to script provided by Gang), but I am not sure if I can use the same approach for analysis across 4 stimuli. The script I tried

3dcalc -a Anova_zscore+tlrc'[1]' -b Anova_zscore+tlrc'[3]' -c Anova_zscore+tlrc'[5]' -d Anova_zscore+tlrc'[7]' -expr 'astep(a,4.03) +2*astep(b,4.03) +4*astep(c,4.03) +8*astep(d,4.03)' -prefix All_sum_z


resulted in too many color outputs, and honestly, it's a bit difficult for me to distinguish which one belongs to a task and which one to the overlap.
My question: is there any way to show common and task-related activation on the single map across 4 tasks using conjunction analysis approach, or there is a better alternative way?

Thanks in advance
Kristina