[Eeglablist] ASR with clean_rawdata

[Cedric Cannard]

Dear Siddhartha,

If you check the parameter "Use Riemannian distance metric", ASR will reconstruct the signals where bursts and artifacts are detected. And yes, the phase will be affected. If you leave it unchecked, it will remove the whole segment. So I'd recommend doing that with very lax thresholds and use ICA to extract eye/muscle components. This will also affect the phase but should be more targeted than ASR I would imagine (and should preserve the phase of the "good" brain components. Not sure how this would affect connectivity values, but probably better than computing connectivity on eye blinks. Curious if someone has tested how different preprocessing methods affect connectivity/cross-spectrum estimations. 
If they are eyes closed (i.e., not too many eye blinks and movements) and the sample is not too large, I would consider removing bad portions manually. 

Cedric



------- Original Message -------
On Thursday, December 8th, 2022 at 3:55 PM, Pandit, Siddhartha <SPANDIT2 at mgh.harvard.edu> wrote:


> Hello!
> I am trying Makoto’s preprocessing pipeline on resting state EEG data. I don’t like the idea of epoching resting state data, so I am trying ASR (clean_rawdata) to remove artifacts. Since I would like to do connectivity analyses, does ASR modify the phase of the signal in any way?
> Do you have any further advice on rsEEG preprocessing avoiding epoching?
> 
> Thank you!
> Siddhartha Pandit
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