Hello,
We have been analyzing some of our data using the gamma variate function in our GLM model. However, we have been having a hard time determining which is the best appropriate delay time for the 8 subjects we have for our study. Recently, we have taken the exhaustive approach of running analyses separately for each subject with a delay in the gamma function at 0 sec, 2 sec, 4 sec, and 6 sec. And from there we compare the resulting activation maps. The most appropriate delay time in the gamma function differed from subject to subject. Is there some possible alternative to this method? Is there anything in the fmri literature that has addressed this type of issue?
Your help would greatly be appreciated.
Thanks
Michael
