[Eeglablist] channel location file
balazs at cogpsyphy.hu
Mon Jul 12 06:43:45 PDT 2010
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?
> 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.
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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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