[Eeglablist] Converting EEG Montage to Standard Montage

[James Desjardins]

Hi Iman,

Sorry that the documentation is scarce, this is one of a few extensions that I am trying to prepare for the EEGLAB extension manager (I just could not help but pre-release it when I saw your message!). For now I have posted an interpmont demo video here<http://youtu.be/Q8qYxNvz_OQ> performing what I believe you are interested in.

The channels in the coordinate file do not need to be the same as the currently loaded chanlocs structure... they also do not need to sit on the same surface as you will see in the demo.

I typically use this extension for warping the chanlocs structure or interpolating an average reference site. What you are asking for, I usually only use for exporting a study set's worth of ERPs (to sLORETA for example). So keep an eye on it (as there may still be some quirks [e.g. fiducials may become unaligned with the data...]). Feel free to open "issue" tickets from the github repository if you notice any problems or come across a road block.

James
________________________________
From: eeglablist-bounces at sccn.ucsd.edu [eeglablist-bounces at sccn.ucsd.edu] on behalf of Iman M.Rezazadeh [irezazadeh at ucdavis.edu]
Sent: April-10-14 5:49 PM
To: James Desjardins; 'EEGLAB List'; mmiyakoshi at ucsd.edu; 'Arnaud Delorme'
Subject: Re: [Eeglablist] Converting EEG Montage to Standard Montage

Hi James,
Thanks for your email!
So, should the electrode labels be the same in the original EEG file and the new coordinates? Could you please elaborate more how should I use the plug-in?
Best
Iman

From: James Desjardins [mailto:jdesjardins at brocku.ca]
Sent: Thursday, April 10, 2014 7:46 AM
To: Iman M.Rezazadeh; 'EEGLAB List'; mmiyakoshi at ucsd.edu; 'Arnaud Delorme'
Subject: RE: [Eeglablist] Converting EEG Montage to Standard Montage

Hi Iman,

I have an EEGLAB extension "Interpmont" that may help. It can be downloaded from the public github repository here.<https://github.com/jadesjardins/interpmont>

"EEGLAB extension for interpolating recording locations. Utilities include changing current locations to fit a model surface (warplocs), Interpolating current data to locations in a coordinate file (interpmont) and re-referencing to the average interpolated site from a coordinate file (interpref)."

Once you have the extension folder extracted into the EEGLAB plugins folder use " Tools > Interpolate to coordinate file > interpolate the data to sites in a coordinate file". In the GUI select an EEGLAB recognized coordinate file and then in the "Optional inputs" edit box enter <'manual','on'> (this will allow you to coregister your loaded data set chanlocs coordinates to the surface of the new coordinate file [if they are not already on the same surface]).

James Desjardins, MA
Electrophysiology Technologist
Cognitive and Affective Neuroscience Lab, Psychology Department
Jack and Nora Walker Centre for Lifespan Development Research
Brock University
500 Glenridge Ave.
St. Catharines, ON, Canada L2S 3A1
905-688-5550 x4676
--
"'Cause you never can tell What goes on down below!
"This pool might be bigger Than you or I know!"

McElligot's Pool
Dr.Seuss 1947
________________________________
From: eeglablist-bounces at sccn.ucsd.edu<mailto:eeglablist-bounces at sccn.ucsd.edu> [eeglablist-bounces at sccn.ucsd.edu] on behalf of Iman M.Rezazadeh [irezazadeh at ucdavis.edu]
Sent: April-09-14 4:19 AM
To: 'EEGLAB List'; mmiyakoshi at ucsd.edu<mailto:mmiyakoshi at ucsd.edu>; 'Arnaud Delorme'
Subject: [Eeglablist] Converting EEG Montage to Standard Montage

Hi EEGLABers,

I want to transform my current electrodes’ montage (128ch – bad electrodes) for each individual subject to a standard montages ( like 81 channels ) like what I can do it in BESA to make all of the electrode locations standardized for group comparison in ELECTRODE SPACE NOT SOURCE SPACE. Is there any function /plug-in to do it?
Best
Iman


============================================
Iman M.Rezazadeh, Ph.D , M.Sc., B.Sc.
Research Associate II
Semel Institute for Neuroscience and Human Behavior
University of California, Los Angeles (UCLA)


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