concatenating multiple resting state runs

AFNI Message Board
1

Hi,
I have a resting state data set where some participants have 10 minute runs, some have 5 minute runs, and some have two five minute runs that were either collected during the same scan session, or on separate days.

Is it possible to concatenate two five minute resting state runs and analyze it as a single 10 minute session? Or do I have to treat it differently?

I would appreciate any insight!

Josh

2

Is it possible to concatenate two five minute resting state runs and analyze it as a single
10 minute session? Or do I have to treat it differently?

It depends on what kind of analysis you’re planning to perform on the data. With seed-based correlation analysis, concatenation should be fine as long as you mark the temporal discontinuities with program 3dDeconvolve. However, you don’t have to physically concatenate the data: check out Example 9 or 9b in afni_proc.py.

3

Hi Gang,
I checked examples 9 and 9b but they did not seem to have multiple runs. How should I mark the temporal discountinuities? By treating each run as a 5 minute block?

Thank you
Josh

4

Hi Josh,

Just give afni_proc.py all of your datasets, as in:

-dsets sb23/epi_r*+orig.HEAD
  • rick
5

got it. Thanks Rick!