[Eeglablist] Importing and Exporting EGI Data To/From EEGLab

[Joseph Dien]

I might be able to help with it but would need a copy of the file and  
a description of exactly what you did to import it into EEGlab.   
Basically, I wrote the FieldTrip code for importing segmented Simple  
Binary files but someone else patched it to handle unsegmented data  
and it sounds like something about the patch isn't working.

On the other hand, if all you want to do is use ICA, I'd recommend  
using my ERP PCA Toolkit.  It has an automatic routine for applying  
EEGlab's ICA to session data to remove eye blinks.  It also  
facilitates using ICA on averaged ERP data (if that's what you want to  
do).  I myself use EGI data so both EGI EGIS and Simple Binary formats  
are fully supported for both import and export. It's currently in beta  
and I'm about to post a new release.  I'd be happy to send a copy to  
you.  Otherwise, keep an eye on it at: http://sourceforge.net/projects/erppcatoolkit/ 
.

Cheers!

Joe

On Oct 24, 2009, at 2:06 PM, Camilla Hileman wrote:

> Hi all,
>
> I currently use NetStation (EGI) for data analysis. However, I would  
> like
> to use Independent Components Analysis on my data, and NetStation  
> doesn't
> have this option. So, I am trying to figure out how to import my  
> data into
> EEGLab. However, I'm having a difficult time with this. I have a few
> questions, and I would be quite grateful to anyone who could help out!
>
> 1. When I input the data into EEGLab, I get the following warning/ 
> error
> messages:
>
> 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 (180829) 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 139 ...
> eeg_checkset note: creating the original event table (EEG.urevent)
> Removing 1 channel(s)...
> pop_chanevent: importing events from data channel 138 ...
> eeg_checkset note: creating the original event table (EEG.urevent)
> Removing 1 channel(s)...
> pop_chanevent: importing events from data channel 137 ...
> eeg_checkset note: creating the original event table (EEG.urevent)
> Removing 1 channel(s)...
> pop_chanevent: importing events from data channel 136 ...
> eeg_checkset note: creating the original event table (EEG.urevent)
> Removing 1 channel(s)...
> pop_chanevent: importing events from data channel 135 ...
> eeg_checkset note: creating the original event table (EEG.urevent)
> Removing 1 channel(s)...
> pop_chanevent: importing events from data channel 134 ...
> eeg_checkset note: creating the original event table (EEG.urevent)
> Removing 1 channel(s)...
> pop_chanevent: importing events from data channel 133 ...
> eeg_checkset note: creating the original event table (EEG.urevent)
> Removing 1 channel(s)...
> pop_chanevent: importing events from data channel 132 ...
> 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)...
> eeg_checkset note: re-creating the original event table (EEG.urevent)
> Creating a new ALLEEG dataset 1
>
> I'm having a difficult time interpreting these error messages,
> particularly given that I am using a 128 channel (plus reference)  
> cap. So,
> I'm not sure why channels 130-139 are being mentioned in the error
> message. When I look at the data in EEGLab, it SEEMS to look okay. Is
> there an alternative way to export the data? Or is there a way to  
> double
> check to make sure that the data exported correctly? I've tried to  
> export
> a text file of the data from EEGLab, but the text file is SO big (129
> columns x 181,000 rows) that it's difficult to read and won't fit into
> Excel.
>
> 2. I am mainly exporting the data into EEGLab to use Independent
> Components Analysis. After using this tool, I will need to perform  
> several
> other operations on my data. It appears that EEGLab can perform most  
> of
> these operations ... but perhaps not everything? I can't figure out  
> how to
> get EEGLab to segment the data based on the type of stimulus and  
> whether
> the participant responded to the stimulus correctly. Also, I can't  
> figure
> out how to get EEGLab to automatically detect and export latency/ 
> amplitude
> information. Is anyone aware of how to do this in EEGLab?  
> Alternatively,
> if this can't be done in EEGLab, how can the data be exported back to
> NetStation?
>
> I would be very thankful to anyone who would have some advice!
>
> Best,
>
> Camilla Hileman
> University of Miami
>
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--------------------------------------------------------------------------------

Joseph Dien,
Senior Research Scientist
Center for Advanced Study of Language
University of Maryland
7005 52nd Avenue
College Park, MD 20742-0025

E-mail: jdien07 at mac.com
Phone: 301-226-8848
Fax: 301-226-8811
http://homepage.mac.com/jdien07/