I want to calculate the difference between sources in two conditions.
but which procedure is correct?
1- calculating the difference of sources in each subject and then grand averaging
2- calculating the sources of each condition from grand average ERPs and then subtracting one from the other.
Best
Shadi
Hi Shadi,
are you planning to use individual head models for source estimation? In that case I think only option 1 is preferable as the you will receive individual source differences. Interpolating then across the subjects also gives you the opportunity to estimate a standard error for the grand-source difference.
I hope I got it right and the answer is helpful.
Best,
Aljoscha
Dear Dr. Yadollahpour
thank you so much for your response.
I have only one group of subjects but I'm using the first approach right now. as you said second approach is not a good option and is less precise.
Best
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