[Mne_analysis] EGI sensor layout

[Aaron Newman]

Hi Emily

The plot you showed from MNE in your original post is the layout map for
the much-older GSN 200 2.1 nets. For the past many years (decade?) EGI has
sold the HCGSN nets, which have a slightly different layout (as shown in
the "official" EGI layout you attached). As you noticed, a telltale sign is
whether the bottom-most centre electrode in the layout map is 81 (new) or
82 (old).

I haven't tried importing EGI data into MNE yet, so I can't speak directly
to your issue. However I do know that EEGLAB for years (and possibly still)
by default uses the old layout when using their EGI importer. The EEGLAB
folks did, however, post a layout map file for the new HCGSN configuration,
which you can find at https://sccn.ucsd.edu/bugzilla/show_bug.cgi?id=1643
It should be in a standard format that hopefully MNE recognizes, or could
be adapted pretty easily. Getting EGI data into MNE has been on my to-do
list but I haven't tried it yet!

Best,
Aaron

On Tue, 14 Feb 2017 at 12:55 Emily Ruzich <Emily.Ruzich at neuro.gu.se> wrote:

> Hi Jaakko,
>
> I think we may have resolved this? The updated code is
>
> file = '/Users/delfin/Documents/RPKPILOT/RAW/PILOT002_GONOGO.set'
> ### read channel names and get raw data
> mon = mne.channels.read_montage('GSN-HydroCel-128')
> raw = mne.io.read_raw_eeglab(file, preload=True)
> raw.set_montage(mon) ## !!
> ### look at channels
> mne.viz.plot_sensors(raw.info, show_names=True)
> raw.plot_sensors(show_names=True)
> raw.plot_sensors('3d')
>
> Sorry for any confusion! Hopefully we are correct and this is the right
> layout!
>
> ------------------------------
> *From:* mne_analysis-bounces at nmr.mgh.harvard.edu [
> mne_analysis-bounces at nmr.mgh.harvard.edu] on behalf of Jaakko Leppakangas
> [jaeilepp at gmail.com]
> *Sent:* Tuesday, February 14, 2017 3:14 PM
> *To:* Discussion and support forum for the users of MNE Software
> *Subject:* Re: [Mne_analysis] EGI sensor layout
>
> Hi Emily,
>
> I'm unable to replicate this. Looks like some channels are missing from
> your plot. Can you copy-paste the commands you run to plot this figure?
>
> -Jaakko
>
> On Tue, Feb 14, 2017 at 2:28 PM, Emily Ruzich <Emily.Ruzich at neuro.gu.se>
> wrote:
>
> Hello all,
>
> I have a question about the sensor layout map for EGI hydrocel sensor nets.
>
> I have been studying the two figures attached - one is the 128 channel map
> provided by EGI, the other is the sensor positions determined by using the
> commands mne.channels.read_montage('GSN-HydroCel-128') and
> mne.viz.plot_sensors.
>
> While there are similarities, some definite differences exist - notably,
> 81 has shifted from the occipital midline to close to the vertex. Has this
> been addressed before? And if so, what is the advice you recommend?
>
> Many thanks!
> Emily
>
>
>
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-- 

Aaron J Newman, PhD

Professor

Director, RADIANT CREATE Neurotechnology Innovation Training Program

Director, NeuroCognitive Imaging Lab (NCIL)

FACULTY OF SCIENCE

Department of Psychology & Neuroscience

FACULTY OF MEDICINE

Departments of Pediatrics, Psychiatry, and Surgery

Aaron.Newman at dal.ca

+1.902.488.1973 | fax: +1.902.494.6585

Box 15000, Life Sciences Centre, Halifax NS B3H 4R2 Canada

DALHOUSIE UNIVERSITY

NCIL.science <http://ncil.science/>
dal.ca/RADIANT <http://www.dal.ca/RADIANT>
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