[Eeglablist] extracting Epochs

[Makoto Miyakoshi]

Dear Lina and Malte,

You can disable ASR's window rejection option so that before and after ASR
your data length will be unchanged. This however means that even if
clean_rawdata() wants to reject some really bad portion that ASR could not
completely correct, it can't reject it.

Makoto

On Fri, May 8, 2020 at 2:57 AM Lina Ismail <linaelsherif at knights.ucf.edu>
wrote:

> Dear all,
> I am following Makotos  preprocessing order (02/28/2020 updated)
> as follows:
>
>   1.  Change the option to use double precision
>   2.  Import data
>   3.  Downsample if necessary
>   4.  High-pass filter the data at 1-Hz (for ICA, ASR, and CleanLine)
>   5.  Import channel info
>   6.  Remove line noise using CleanLine
>   7.  Apply clean_rawdata() only to reject bad channels.
>   8.  Interpolate all the removed channels
>   9.  Re-reference the data to average
>   10. Apply clean_rawdata() only to perform Artifact Subspace
> Reconstruction (ASR).
>   11. Re-reference the data to average again--this is to reset the data to
> be zero-sum across channels again.
>   12. Run AMICA using calculated data rank with 'pcakeep' option (or
> runica() using 'pca' option)
>   13. Estimate single equivalent current dipoles
>   14. Search for and estimate symmetrically constrained bilateral dipoles
>
> My question  is after step 11 which means before running AMICA,  I starts
> extracting the data epochs it gave me few number of epochs compared to my
> real epochs. for example, 9 but I suppose to have 33. However, when I skip
> doing Artifact Subspace Reconstruction (ASR) alone byt remove the bad
> channels it gave me the correct number of epochs!
> Do you have clarification for that?
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