[Eeglablist] relation between EEG data and other signal, average ref question

[Makoto Miyakoshi]

Dear Ida,

1. Put event markers for breathing onset/peak/offset and try event-related
potential analysis. Regression analysis seems to work too, but the current
EEGLAB does not support it.

2. Reference and ground are not for data recording. Well, reference channel
is paired with ALL channels, actually. After average referencing you can
recover at least reference channel signal, but that introduces redundancy
(because the recovered channel is a pure linear combination of the
surrounding channels). Note also that after average referencing you have to
discard one channel.

It's better for you to google what reference and ground channels do. You
don't know it means you don't know how EEG is recorded, which is no good.

Makoto

2013/6/17 ida miokovic <ida.miokovic at gmail.com>

> Dear list,
>
> I have 2 questions which I will try to present as clear as I can and to
> thank you in advance for any help:
>
> 1. I am trying to find relation (causal connection) between EEG dataset
> and certain breathing signal (let's say it is B signal) recorded at the
> same time as EEG.
>
>  I performed EEG data preprocessing (filtering, ICA and removal of
> components recognized as artifacts).
>
>  So on one side I have continuous signal of EEG channels and on the other
> side continuous signal B (of the same size as EEG channels recording). What
> are the best ways to perform this in EEGLAB? I suppose everyone is always
> trying to find certain relation between something and EEG signals so I
> suppose it is not unusual request.
>
> 2. This question is about re-referencing to the average reference - EEG
> dataset I am working with has been recorded with AFz as GND and FCz as REF
> (128 chennels Acti Cap is used). Nothing from these channels isn't present
> in data I have (I did not participate in recording procedure) and I would
> like to re-reference data to the average reference. Is it usual that
> activity from REF and GND channels are not given/measured? In tutorial  of
> EEGLAB, I found suggestion to include reference channels in the average
> reference if they are on the scalp. Mine are on the scalp, but I don't have
> any recordings of them. Also, everyone is mentioning REF electrode, and I
> have GND too...
>
> Kind regards and thank you for your time and help
>
> Ida
>
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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