[Eeglablist] Where to (alternatively) put ground and ref on ActiCap

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Wed Dec 16 10:47:53 PST 2015


Dear Clemens,

If you run ICA it'll evaluate the spatial distribution of the frontal theta
across ALL channels, so it does not matter if you miss FCz for example.

Otherwise--reference and ground channels are the two most important
channels which you CANNOT reject. Therefore you want to place them to the
most mechanically stable location, such as earlobe using a clip. If you set
the reference to Cz for example and the electrode cap was a bit too big or
does not fit the subject's head shape, your Cz may be loose--this will be a
disaster.

I recommend you use average reference even if you don't use ICA, so the
initial reference location is relatively trivial (other than the contact
stability issue).

Both nose tip and earlobes sound good, but I would personally avoid nose
tip since it bothers subjects.

Makoto

On Mon, Dec 14, 2015 at 6:40 AM, Clemens DICKHUT <clemens.dickhut at uni.lu>
wrote:

> Dear EEG experts,
>
> I am using the standard ActiCap (layout attached) and I would like to
> replace the ground (AFz) and reference (FCz) electrodes with two others, as
> these occupy the frontal-medial region which will be a region of interest
> in my analyses (frontal-midline theta oscillations during working memory).
>
> Which electrodes do you think could I sacrifice from the head to use as
> FCz and AFz, or in other words, which other sites would be appropriate for
> ground and reference?
>
> I was thinking about the nose as reference and leaving the ground where it
> is, or, using POz and Oz as Ref and ground, respectively.
>
> What do you suggest? Thanks in advance for your input!
>
>
> Kind regards,
> Clemens
>
>
>
> __________________________________
> Clemens Dickhut, M.Sc., (PhD Student)
> Institute for Health and Behaviour
> Research Unit INSIDE
> University of Luxembourg - Campus Belval
> Maison des Sciences Humaines
> 11, Porte des Sciences, R. 04 415
> L-4366 Esch-sur-Alzette
> Tel.: (+352) 46 66 44 9536
>
>
>
> Begin forwarded message:
>
> *From: *Clemens Dickhut <clemens.dickhut at icloud.com>
> *Subject: **ActiCap setup*
> *Date: *14 Dec 2015 15:28:18 CET
> *To: *Clemens DICKHUT <clemens.dickhut at uni.lu>
>
>
>
>
>
>
> Von meinem iPhone gesendet
>
>
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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