I have several datasets from different clinics that I am processing.
I also have research datasets that I use.
These datasets sometimes use different electrode montages, i.e. 10-20, 10-10, 10-05, or something unique, like a 10-20 that has T1 and T2 electrodes added, but no O1 and O2.
Another example is a research dataset that uses 10-05 (-ish), and does not include Fp1 and Fp2.
I would like for them all to be usable as 10-20 datasets.
Is it possible (and advisable) to convert between the systems using interpolation?
Or perhaps running ICA, then projecting back to a different montage?
That depends on how many channels you would have to interpolate. Based on how you describe the situation it sounds like you’d have to interpolate a different amount of different channels for each dataset … it could be possible, but might also be “a bit much”.
Why don’t you try and then write a snippet of a potential “methods section” → writing this section and then reading it will give you a good idea of how reasonable that approach sounds.
Alternatively you could select a small subset of electrodes that is present for all (most) datasets.
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