[FieldTrip] low-pass filtering

[Simanova, I. (Irina)]

Hi Diego, Hi Matthias, Dear Burkhard, 

Thank you very much for your replies, they are very helpful.

My intuition was that the permutation test should not be affected by the filtering, because any non-independecy would be identical in the real and permuted data. And I would also expect that averaging over 25 ms reduces the data and removes all effects. The simulation (thank you, Diego), and the comment on the bandwidth (thanks Burkhard) make it really clear. We will indeed rerun the analysis on downsampled data to 125hz, and I do not expect to see much difference from the original analysis, same as in Diego’s simulation.

Best,
Irina