[Eeglablist] recording facial EMG with monopolar montage

[Makoto Miyakoshi]

Dear Maria,

> I read this could add some noise to the signal but it is not completely
clear to me why this would happen and which offline procedure I could use
to improve the SNR.

I wonder why, too.
I can think of only one possible case: when you run average referencing. If
you don't exclude the facial channels, you may introduce EMG into scalp
channels. You may want to exclude facial channels from those with which
average reference is computed.

I'd like to know whether there are other factors we need to consider...

Makoto

2014/1/20 Maria Serena Panasiti <m.serenapanasiti at gmail.com>

> Dear List,
>
> we are setting up an experiment in which we would like to simultaneously
> record EEG and facial EMG. Unfortunately at the moment we just have
> monopolar amplifiers so we were wondering if it was actually possible to
> measure a clean EMG activity by using monopolar  electrodes (with  cephalic
> ground and reference) and by then offline subtracting the two channels. I
> read this could add some noise to the signal but it is not completely clear
> to me why this would happen and which offline procedure I could use to
> improve the SNR.
>
> Any help would be very much appreciated!
>
> Best wishes,
>
> Serena
>
> --
> Maria Serena Panasiti, Ph.D
>
> Cognitive Social and Affective Neuroscience Lab
> Department of Psychology.
> University of Rome "La Sapienza".
> Via dei Marsi 78 - 00185 - Roma.
> Phone: (+39) 06-49917635. Fax: (+39) 06-49917635
>
> School of Psychology & Clinical Language Sciences
> University of Reading
> Reading, United Kingdom
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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