Hi all, I have been looking into the task fMRI data and comparing the timings saved in EVs folder with those explained Table 4 in Barch et al. (2013) "Function in the human connectome: Task-fMRI and individual differences in behavior".
I am new to fMRI, so maybe I am missing something basic but the numbers do not seem to exactly match what I expect. I would greatly appreciate if some of you could l clarify this for me. 1. What is the length of a frame? If I use read_avw.m function provided by FSL, I get 0.72 s/frame. The numbers I get from Table 4 in Barch et al. seem to vary from a task to another. For example, for WM task, 5:01 / 405 frames = 0.74 s/frame. Actually, the numbers in this table does not add up as I would expect. For example, for the motor task, according to the table the run duration is 3:34 (min). But 10 * (12 + 3) + 3 * 15 = 3:15 (min). 2. Does the first fMRI frame corresponds to the origin (0s) of the times in *.txt files in EVs folder? The first trial (or cue) saved in EVs folder seems to be always around 8s and the last trial seems to end always much earlier than the duration of a run. I was wondering what time the timings in *.txt files are measured from. 3. What is Sync.txt in EVs folder? It doesn't seem to be explained in the reference manual. Thanks, Ryota Tomioka _______________________________________________ HCP-Users mailing list [email protected] http://lists.humanconnectome.org/mailman/listinfo/hcp-users
