Sorry, I don't have a paper on it On 8/7/2020 10:27 AM, Nasiriavanaki, Zahra wrote: > Hi Doug > > Thanks so much for your reply. This is a question that a reviewer has pointed > out. They were concerned that with the stimuli duration of 16 sec, maybe I am > not using the correct hpf cutoff. > Could you please refer me a paper about this? > > Thanks > Mona > > >> On Aug 7, 2020, at 10:15 AM, Douglas N. Greve <dgr...@mgh.harvard.edu> wrote: >> >> There is not a hard and fast formula. With a block length of 16 sec, you >> will have frequencies at 0.0625Hz and multiples thereof. The closer you >> are to 0.625, the more signal you are going to lose. Also, if you don't >> remove the whitening, then FSFAST will compute a highpass filter for >> you. I think that .01Hz is probably fine, but you could bump it up to >> .02Hz too >> >> On 8/6/2020 6:11 PM, Nasiriavanaki, Zahra wrote: >>> Hi Freesurferers >>> >>> Could you please let me know how I should calculate the high pass filter >>> cutoff? I have seen a bunch of different formulas (i.e 1.5*the stimulation >>> period)? >>> My task is a block-designed task, each stimuli takes 16 seconds and is >>> followed by the next stimuli without an ITI. TR=2, number of conditions=8. >>> I have used a hpf=0.01, Is this correct? >>> >>> Thanks >>> Mona >>> >>> >>> _______________________________________________ >>> Freesurfer mailing list >>> Freesurfer@nmr.mgh.harvard.edu >>> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer >> _______________________________________________ >> Freesurfer mailing list >> Freesurfer@nmr.mgh.harvard.edu >> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
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