I use a NIRx NIRScout fNIRS recording system with 26 LED sources and 27 detectors. During one of our data collection sessions, we forgot to select “bilateral” in the NIRStar set-up menu, and subsequently the data was collected at a sampling rate of about 2.4 Hz, instead of the typical 4.8 Hz that the other data points have. Is there any way that I can still use this data in our analysis pipeline/ upsample the fNIRS data that would be appropriate?
Hi @ansleykunnath - the usual re-sampling method for neural time-series signals is down sampling. So this would mean down sampling your 4.8 Hz files to 2.4 Hz.
I believe that it is unlikely that anyone here would suggest upsampling your data.
Thank you for the reply! My follow-up question is whether there’s any meaningful difference between fNIRS data collected in bilateral mode that’s downsampled vs. data collected in default mode. NIRx says that “in a bilateral pattern, two sources are on at the same time” as opposed to one source at a time. Would it still be okay to group this data together?
I don’t work with fNIRS data so I am not sure. You may have better luck reaching out to your lab’s NIRx contact 