Hello Katerina,

- The first row in the SyncSlide.OnsetTime column reflects the onset of the 
first TR in E-Prime clock (i.e., the first trigger). This time must be 
subtracted from all other timestamps in the TAB.txt to determine the amount of 
time since the first trigger / first BOLD volume.

- To determine the onset of the task blocks, use Cue2Back.OnsetTime for 2-back 
blocks or CueTarget.OnsetTime for 0-back blocks. The individual task stimuli 
are presented after the task cue.

- Additional information about the timing values in the TAB.txt files is 
provided in Appendix 6 to the HCP Reference Manual:

https://www.humanconnectome.org/storage/app/media/documentation/s1200/HCP_S1200_Release_Appendix_VI.pdf

--Greg

____________________________________________________________________
Greg Burgess, Ph.D.
Staff Scientist, Human Connectome Project
Washington University School of Medicine
Department of Psychiatry
Phone: 314-362-7864<tel:314-362-7864>
Email: [email protected]<mailto:[email protected]>

On Jun 9, 2018, at 9:18 AM, Katharina Ring 
<[email protected]<mailto:[email protected]>> wrote:

Hi everyone,

I am working on the working memory task fMRI data and want to extract the exact 
times for when the first picture of each block is shown. I found the 
WM_run2_TAB.txt file and in it the column “Stim.OnsetTime”. However, the first 
stimulus is at 36 seconds according to this file, which contradicts the info in 
the Evs folder. I am guessing the Stim.OnsetTime includes some time before the 
task starts? Is there a way to find out how much time exactly that is, so I can 
get the exact time where the picture starts to be shown? Also, I couldn’t find 
an end time for the pictures. Is there an exact end time reported somewhere or 
do I have to use the approximate 2 seconds for the stimulus duration? There is 
the “Stim.OnsetToOnsetTime” Column, but I thought after every picture shown, 
there is a 0.5 seconds pause?

Thanks in advance,
Katharina
PS: I'm sending this again as I haven't gotten any answers last time. Still 
hope, someone can help!


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