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Hi Freesurfer Developers, 

I am analyzing a fear conditioning imaging study and am attempting to regress out the shock/unconditioned stimulus by adjusting the modulation weights in my par file. I set the stimuli  presented with the shock (CS+) with a modulation weight of -1 and set all other unshocked/unpaired stimuli (CS- and fixation) with a weight of 1. 

Similarly, we have a few CS+ trials where the participants are expecting a shock but didn't receive one -- I have been setting these with a modulation weight of 1 similar to the CS- and fixation stimuli. 

I attached a copy of our .par file. Could you let me know if this makes sense for our analyses? 

Best,

Gillian Grennan 

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