Dear All:
I am very sorry to bother you. However, I had a (dumb) question regarding the SPM.mat file that accompanies some beta images, and am not able to find the answer unfortunately. Your help much appreciated!
Specifically, I have a directory that contains:
(a) a beta image for each individual
(b) an SPM.mat file from the generation (?) of these Beta images
I would like to use the SPM.mat file to extract:
(i) onsets/durations of events which have been regressed to create the Beta values
(ii) whether the regression was on HRFs * constant or HRFs * some round-dependent value
I believe these should be in SPM.Sess fields (at least my understanding is that this is where they are placed upon creation of the Beta maps), but unfortunately there is neither an SPM.Sess _nor_ SPM.xBF structure in the appropriate SPM.mat files.
Thank you. Please reply to myself as well as the list if possible.
Misha
p.s. I have also attached a very short (one page) document detailing my understanding of how the beta maps are mathematically derived for at least one multi-round economic exchange game in our laboratory. If there is something incorrect or inaccurate in my understanding, I would very much appreciate hearing about it. Thank you!
--
Misha Koshelev
MD/PhD Student
Human Neuroimaging Laboratory
One Baylor Plaza
S104
Baylor College of Medicine
Houston, TX 77030
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