[Eeglablist] EGI 64-channel system to 10-10 international system

[Iman M.Rezazadeh]

Hi, 
If you want to change an EEG recoding montage to a standard montage ( for
example , standard 81 or 27 channel montage from BESA) , you should:
-	Download the Interpmont toolbox from here and copy it into the
EEGLAB plug-in folder
-	Have a standard montage- I have copied the standard 27 and
81-channel montages (an SFP file) which I have taken from BESA software. It
should be noted that you should take out the fuducial channels and change
'Nz' label to sth else like 'Nz1' from the SFP file.
-	Use the following command lines
 
outEEG=pop_interpmont(EEG,desired_montage_electrode_location_file',  ..
..'manual','off');
pop_save(outEEG)
About the Interpmont toolbox by James Desjardins [jdesjardins at brocku.ca] -
It is an 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 co-register your loaded data set
chanlocs coordinates to the surface of the new coordinate file [if they are
not already on the same surface]).
-Best
Iman

-------------------------------------------------------------
Iman M.Rezazadeh, Ph.D

Research Associate II 
Semel Intitute, UCLA , Los Angeles
& Center for Mind and Brain, UC DAVIS, Davis


-----Original Message-----
From: eeglablist-bounces at sccn.ucsd.edu
[mailto:eeglablist-bounces at sccn.ucsd.edu] On Behalf Of Alisha Kozlovsky
Sent: Monday, August 4, 2014 2:39 PM
To: eeglablist at sccn.ucsd.edu
Subject: [Eeglablist] EGI 64-channel system to 10-10 international system

Hi all,

I am working with data obtained from an EGI HCGSN 64-channel cap.  I have
the .sfp file to map out the electrode positions properly in EEGLab.

However, I would like to obtain the signals at specific locations based on
the 10-10 system (Fpz, AF7, etc.) which the EGI cap does not follow, in
terms of naming and electrode placement.  Some electrodes on the EGI cap
overlay the 10-10 electrode positions, but not all.

Is there a method in EEGLab to determine the signals at 10-10 electrode
positions using the signals obtained from the EGI cap?

Thank you very much!

Alisha Kozlovsky



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