why are you doing this with modulation instead of just designating 3 different conditions?
On 3/28/2023 1:36 PM, Gillian Grennan wrote:
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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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