[Eeglablist] channel location file

Laszlo Balazs balazs at cogpsyphy.hu
Mon Jul 12 06:43:45 PDT 2010


Hello Michael,
To your second question: We have just started to try ICA based EOG 
correction and I have the same concern about throwing out some baby with 
the bath water. Once I have tested the regression based method provided 
by Neuroscan. I chose a few subjects with frequent blinks but still high 
enough number of clean sweeps. Then I compared uncorrected and corrected 
sweeps by visual inspection and also the averaged ERP to targets in a 
visual oddball (blink free epochs only).  I have seen marked decrease in 
both EEG and ERP amplitude over Fp1/2. We plan to repeat this test soon 
including ICA and hope it will outperform the regression method. I 
wonder if there are papers or other ideas for validation tests around?
Kind regards,
Laszlo

> Dear all,
>
> are there any channel location files for the Neuroscan QuickCap40 (40 
> channels) available? On the Neuroscan ftp I only found "dave.zip" which 
> contains 32 and 64 channels + I get an error when I read those in, anyway.
>
> And a second question:
> I'm playing around with ICA to reject ocular artifacts from continuous 
> data. Up to now I could find only few papers about the validity of 
> ICA-corrected data. I'm asking myself that question because very often I 
> get components representing the ocular artifacts, but they also seem to 
> contain eeg-information, especially when I use the fastica algorithm. 
> This results in quiet different looking signals in sections where no 
> artifacts occur - mainly in frontal channels of course.
>
> Any help is highly appreciated.
>
> Thanks!
>
> Michael
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     Laszlo Balazs, Ph.D.          /      dr. Balázs László
Institute for Psychology HAS       /   MTA Pszichol¢giai Kutatóitézet
Budapest, P O B 398, H-1394 Hungary / Tel:+36(1)354-2410  Fax:+36(1)354-2416



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