[Eeglablist] importing ERPs

[Joseph Dien]

You might find my EP Toolkit to be useful for this.  It can import EEGlab data files, generate difference waves, and plot them.

https://sourceforge.net/projects/erppcatoolkit/

Cheers!

Joe

On Sep 3, 2012, at 11:17 PM, Joshua Hartshorne <jkhartshorne at gmail.com> wrote:

> I have been trying to plot difference waves (well, really difference topoplots) in EEGLab. Since there didn't appear to be any way to actually do this, I thought I'd get around the problem by exporting the data, computing the condition averages, subtracting the one condition from the other, and then reimport in order to then plot.
> 
> Unfortunately, importing has not bee working. I followed several examples in the wiki, including the one for Matlab arrays which gives and example involving made-up data (http://sccn.ucsd.edu/wiki/A01:_Importing_Continuous_and_Epoched_Data#Importing_a_Matlab_array) but invariably get the following error:
> 
> 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 (25600) 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
> 
> When I plot the data, it ignores anything I told it about where the epoch starts (e.g., -0.2) and starts the epoch at 0 regardless. And when I edit channel info, it says there is only 1 channel, even though it's happy to plot all the channels. 
> 
> Does anybody have any idea what might be happening?
> 
> Josh Hartshorne
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--------------------------------------------------------------------------------

Joseph Dien,
Senior Research Scientist
University of Maryland 

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










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