[Eeglablist] Locating Channel for EGI's 128 + VREF Channel

[Tarik S Bel-Bahar]

Hello Narendra, here are some notes below that should help a little. Let me
know if you continue to have an issue with this basic step. Cheers!




First try to find and download all the EGI location files from the EGI
support site or their support team. These contain versions for their
current hydrocel nets, with and without the VREF. The files are "sfp" files
and are properly & automatically loaded into EEGLAB by using the gui

Edit>Channel Locations, and loading the correct EGI chanlocations file, and
then saving the .set eeglab file with the correct locations. This is easy
and works well. Visualize in 2d and 3d in the channel locations window to
confirm you've achieve cahnnel location sanity.

You might also benefit from googling eeglablist to find answers to similar
questions on the list in the past.In case you need them or don't have them,
I've included the 129 and 128 channel locations (hydrocel adult nets) as
text info below. If you need to you can cut and paste and save as a sfp
file, and eeglab should read it with no problem.

Regarding the "number of channels" it says, first open the EEG data viewer,
and see if you see 128 or 207 channels there. I think you will see 128 or
129 channels, and if you see 207 channels there is a problem with the data
you are importing.

Next, regarding the default channel locations that eeglab applies upon
import of EGI files, just ignore that, and apply the correct channel
locations after the data is imported and in matlab memory. You could try to
manually remove and replace the current locations file that eeglab is
calling from its folders, but I don't recommend doing so. Please put in a
small bug report on eeglab bugzilla, and help the developers make sure they
have all the correct files so that the issue is resolved in the future.

Also, for EEGLAB, remember you need to make sure you export correctly from
EGI's Netstation software. so, specifically, please be sure  that you are
exporting .raw files appropriately with or without the vref. EGI has a new
file format too that might work or be recognized better, you can find out
about it from them (called the Mff or MMF format, for which there is an
eeglab plugin).












































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On Wed, Feb 3, 2016 at 3:33 AM, Narendra Kumar <
narendra.linguistics at gmail.com> wrote:

> Dear EEGLAB / ERPLAB users,
>
> I am using EGI's 128 Channel (withVREF) HGSN EEG system for my experiment.
> Whenever I load the EGI file, it shows the following in the MATLAB window
> and identifies GSN-128 channel as a default channel location.
>
> _______________________________________________
> Warning: This function can only import continuous files or
>          epoch files with only one length for data epochs
> Only one segment, cannot read portion of the file
> Importing binary EGI data file ...
> eeg_checkset warning: 3rd dimension size of data (1) does not match the
> number of epochs (0), corrected
> eeg_checkset warning: number of columns in data (754674) does not match
> the number of points (0): corrected
> eeg_checkset note: upper time limit (xmax) adjusted so (xmax-xmin)*srate+1
> = number of frames
> pop_chanevent: importing events from data channel 207 ...
> eeg_checkset note: creating the original event table (EEG.urevent)
> Removing 1 channel(s)...
> pop_chanevent: importing events from data channel 206 ...
> eeg_checkset note: creating the original event table (EEG.urevent)
> Removing 1 channel(s)...
>
> ........................
> ........................
> ........................
>
> pop_chanevent: importing events from data channel 131 ...
> eeg_checkset note: creating the original event table (EEG.urevent)
> Removing 1 channel(s)...
> pop_chanevent: importing events from data channel 130 ...
> eeg_checkset note: creating the original event table (EEG.urevent)
> Removing 1 channel(s)...
> Warning: event renaming failed
> eeg_checkset note: re-creating the original event table (EEG.urevent)
> Deleting empty data reference channel (reference channel location is
> retained)
> EGI channel location automatically detected GSN129.sfp ********* WARNING
> please check that this the proper file
> readlocs(): 'sfp' format assumed from file extension
> ______________________________________________________
>
> Now I want to know
>
>    1. Why does it shows 207 channels ?
>    2. How can I make the HGSN 128 channel location file as the default
>    file (or should I use HGSN 129 channel because EGI's Net has 128 + VREF
>    channel) ?
>    3. For multiple subject analysis how to write script to load EGI file
>    so that it will locate HGSN-129 channel by default.
>
>                  (When I use
>
> ..................................................
>
> sourcefile = ['G:\Exp1_Asha\Mat_files\',subj,'.raw']
>
>
>
>  % load input file using readegi
>
> EEG = pop_readegi(sourcefile);
> ...............................................................
>
> It shows the following error:
> Warning: This function can only import continuous files or
>          epoch files with only one length for data epochs
> Error using readegi (line 67)
> No such file or directory
>
> Error in pop_readegi (line 106)
>     [Head EEG.data Eventdata SegCatIndex]
>     = readegi( filename);
>
> Error in Preproc (line 22)
> EEG = pop_readegi(sourcefile);
>
> ........................................................
>
>
>
>
>
>
>
>
>
>
>
>
>
> I would be thankful for the help.
>
> Regards,
> Narendra Kumar
>
> _______________________________________________
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