AFNI Message Board

Dear AFNI users-

We are very pleased to announce that the new AFNI Message Board framework is up! Please join us at:

https://discuss.afni.nimh.nih.gov

Existing user accounts have been migrated, so returning users can login by requesting a password reset. New users can create accounts, as well, through a standard account creation process. Please note that these setup emails might initially go to spam folders (esp. for NIH users!), so please check those locations in the beginning.

The current Message Board discussion threads have been migrated to the new framework. The current Message Board will remain visible, but read-only, for a little while.

Sincerely, AFNI HQ

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paulhami
March 04, 2014 08:06PM
Gurujis,

Let's say I'm doing subject-level analysis of a block design FMRI task and want to filter out high frequency fluctuations in the time series (e.g., blocks last 20 sec, TR = 2 sec, filter out fluctuations in BOLD at fastest possible frequency of .25 Hz) during preprocessing and then filter out low frequency noise with -polort A during regression. Provided doing this is advisable (it seems rational to me, but let me know if you think otherwise), how can I do this in the context of afni_proc? Could I use the bandpass option and set the low frequency limit to something beyond the length of the run?

Thanks!

Paul

>:D<
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Subject Author Posted

lowpass filtering in afni_proc

paulhami March 04, 2014 08:06PM

Re: lowpass filtering in afni_proc

rick reynolds March 04, 2014 09:04PM

Re: lowpass filtering in afni_proc

paulhami March 05, 2014 03:04PM

Re: lowpass filtering in afni_proc

rick reynolds March 05, 2014 04:23PM

Re: lowpass filtering in afni_proc

paulhami March 05, 2014 05:44PM