[Eeglablist] EOG

[Joseph Dien]

When you say readses.m, are you referring to my code for reading ERPSS  
files into Matlab?  If so, it doesn't care about how each channel was  
referenced.  I expect the issue has more to do with whether the bipolar  
channels will covary (with respect to the higher moments) properly with  
the other channels, which is what ICA is looking for when it removes  
the blinks.  I would think that the presence of bipolar channels would  
not be a problem for this algorithm since blink activity in the EOG  
channels would still have a linear relationship to blink activity in  
other channels.  Unless there is some problem with assumptions about  
referencing in the EEGLAB code.

Cheers!

Joe


On Friday, August 29, 2003, at 10:12 AM, Timothy O'Keefe wrote:

> That seems odd to me because we are able to import bipolar VEO and HEO
> into EEGLAB (we use Digitize acquisition software whcih records into
> erpss format). They both come up as channels 63 and 64 (as they are
> recorded) AND we have imported and exported (without running ICA) and
> the output yeilds identical datasets. I don't know if that could be a
> result of how MANSCAN codes bipolar electrodes? Though Arno did say  
> that
> "EEGLAB can not yet handle properly bipolar channels". That is  
> confusing
> to me because we have had no problems as of yet removing blinks. Does
> readses.m fix this (Arno, you should know about readses.m)?  I'm not so
> sure cuz Iv'e used the read_erpss function and that reads them in fine
> too. Also, we reference everything to the nose inc. HEO and VEO.
> -Tim
>
> P.S. - Sorry for not including the rest of the conversation before .
>
>
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------------------------------------------------------------------------ 
--------

Joseph Dien
Assistant Professor of Psychology
Department of Psychology
419 Fraser Hall
1415 Jayhawk Blvd
University of Kansas
Lawrence, KS 66045-7556
E-mail: jdien at ku.edu
Office: 785-864-9822
Fax: 785-864-5696
http://people.ku.edu/~jdien/Dien.html
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