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Dear Experts

Assume that I want to  perform a first level GLM analysis on fmri data.Could you please tell me whether I should apply the mask(i.e brodmann3,4) before the analysis(on my preprocessed data) or after the analysis(on beta maps)?
I tried both of 
approaches.However,there is a slight difference on the resulted image for 
each approach.
 

 Regards
 Mahsa