[Eeglablist] when to re-reference

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Thu Dec 4 11:44:28 PST 2014


Dear Bin,

> My question is if the re-reference step must be done before epoch the
data and artefact removal.

If you have crazy channels you have to remove them first and then
rereference to average. Epoching has nothing to do with rereferencing.

I have glanced that Christian Kothe uses robust mean for computing average
reference. Maybe it is supported in BCILAB?

> Because I want to do all of preprocessing steps and artefact removal, and
then apply several different re-reference selections, by this way I don’t
need to do all of preprocessing steps again. Does it sound fine?

I'm not quite sure what you try to do.

> Is there any other artefacts or problems that will be induced by the
re-reference of last step.

Re-reference makes the data rank-deficient by one.

Makoto

On Sun, Nov 30, 2014 at 3:48 PM, Bin Wang <binwang87828 at gmail.com> wrote:

> Dear all,
>
> One simple question: I would like to try several different reference
> selections (i.e. average or mastoid), hopefully, I can find a relatively
> better one. My question is if the re-reference step must be done before
> epoch the data and artefact removal. Because I want to do all of
> preprocessing steps and artefact removal, and then apply several different
> re-reference selections, by this way I don’t need to do all of
> preprocessing steps again. Does it sound fine? Is there any other artefacts
> or problems that will be induced by the re-reference of last step.
>
> I am looking forward your any advices
>
> Thank you in advance,
>
> Bin
>
> ++++++++++++++++++++++++++++++
> Bin Wang
> Cognitive Neuroscience
> Institute of Neuroscience and Medicine (INM-3)
> Forschungszentrum Juelich,
> Leo-Brandt-Str. 5
> 52425 Juelich
> Email: b.wang at fz-juelich.de
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>      &  binwang87828 at gmail.com
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>
> <https://webmail.fz-juelich.de/owa/redir.aspx?C=hswxAlx8wU6cP189jFS_1w0PFSKb8dAIIkV6dqtR-VUUMNMIisKisV7RZADeuZK3wPR2w27Q5yU.&URL=mailto%3abinwang87828%40gmail.com>
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> ++++++++++++++++++++++++++++++
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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