Hi,
I'm analyzing NKI tasks data but I got trouble with the timing onsets for both breath hold and visual checker board. Here are some QC testing I did for both breath and visual

To summarize:
visual : in the website it is written 2.5mn, in the onset file 2mn and in the raw data 2mn 17.20sec. Raw data shows about 17 seconds time difference compared to the onset file.
breath: in the website it is written 10mn, in the file 4mn 12sec and in the raw data 4mn 20.4sec. There is about 8 second difference between raw data and the onset file (let's consider that the 10mn in the website is a typo).
if you have any hint on these miss match I'll be very happy to hear about it and do more testing if needed

Thanks
Yassine