History of AFNI updates  

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May 09, 2022 12:32PM
Hi Rick,

yes, some of the runs indeed go up to two hours. These are sleep recordings and subjects were allowed to sleep in the scanner up to two hours.
I will now try running my script again adding
-regress_polort 2         \
-regress_bandpass 0.01 1
as you suggested, thank you. The option -regress_compute_fitts does not work or make sense here, because I use a resting-state script.

Update: AFNI proc ends up with 147 baseline funcs for over 2100 time points when using polort 2 and bandpass 0.01-1.



Meanwhile, I would like to ask you another question. When I am intersted in the BOLD signal’s power in the frequency-domain, say at around 0.01 Hz, would you recommend to always use a polort degree of 2 in combination with a bandpass filter (instead of using the automatic calculation of polort depending on the run length)?

I read through the message board, and I also read some AFNI .pdf files, but I don't really understand how the polort option affects the BOLD signal (in a comparison before/after preprocessing). It is possible to explain this theoretically in easy words?

So, if I am interested in the frequency spectrum of the signal, and not so much in statistical parametric maps, is there a better way to adjust the -regress_polort option than leaving it at the default autocomputation? But, I assume that there is not one correct answer here, and the appropriate polort option rather depends on many factors?



Edited 3 time(s). Last edit at 05/09/2022 01:47PM by Philipp.
Subject Author Posted

AFNI proc -regress_polort option for very long runs

Philipp May 07, 2022 08:47AM

Re: AFNI proc -regress_polort option for very long runs

rick reynolds May 09, 2022 11:55AM

Re: AFNI proc -regress_polort option for very long runs

Philipp May 09, 2022 12:32PM

Re: AFNI proc -regress_polort option for very long runs

rick reynolds May 09, 2022 02:08PM

Re: AFNI proc -regress_polort option for very long runs

Philipp May 09, 2022 02:17PM

Re: AFNI proc -regress_polort option for very long runs

rick reynolds May 09, 2022 02:39PM

Re: AFNI proc -regress_polort option for very long runs

Philipp May 09, 2022 02:44PM

Re: AFNI proc -regress_polort option for very long runs

rick reynolds May 09, 2022 02:51PM

Re: AFNI proc -regress_polort option for very long runs

Philipp May 09, 2022 02:58PM

Re: AFNI proc -regress_polort option for very long runs

rick reynolds May 09, 2022 03:31PM

Re: AFNI proc -regress_polort option for very long runs

Philipp May 09, 2022 03:35PM

Re: AFNI proc -regress_polort option for very long runs

rick reynolds May 09, 2022 04:10PM



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