[Eeglablist] Converting EEG Montage to Standard Montage

Thu Apr 17 21:41:56 PDT 2014

Sorry for my delay Iman,

I have not had a chance to try to replicate the bug that you reported. In the mean time, something to try... I normally use one of the standard_1020 elc files that comes with eeglab. Make a copy of it and then edit it in a text editor so that it only contains the desired channels. Then use interpmont create the data at the new sites.

I hope that this helps

___
Sent from an auto-correcting touch screen device.
___
James

On Apr 14, 2014, at 4:08 PM, "Iman M.Rezazadeh" <irezazadeh at ucdavis.edu<mailto:irezazadeh at ucdavis.edu>> wrote:

Hi James,
Thanks for your email and the video.
I have been trying to use the toolbox according to the YouTube video and change the head radius in EEGLAB to 85;  but I have got a strange error ( see below) and I could not even see the head model and rotate it! My goal is to change the current montage of the data from 128-channel EGI ( which apparently I have rejected some bad channels so I have less than 128 channels) to the standard 81 or 27 channel montage from BESA ( or whatever standard montage with less channels , like 27) . I have attached the electrode location file  that I have been trying to use. I have downloaded it from : http://robertoostenveld.nl/?p=5
Do you have any idea what is going wrong or the electrode location file is incorrect or what? Or do you have a 21/27 montage that works well for you and you can share it here.

<image001.png>

Very best
Iman

============================================
Iman M.Rezazadeh, Ph.D. , M.Sc., B.Sc.
Research Associate II
UCLA David Geffen School of Medicine
Semel Institute for Neuroscience and Human Behavior
760 Westwood Plaza, Ste 47-448
Los Angeles, CA  90095

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<mailto: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<mailto:eeglablist-bounces at sccn.ucsd.edu>] on behalf of Iman M.Rezazadeh [irezazadeh at ucdavis.edu<mailto: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)

<81ch_montage.sfp>
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