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<div class="">A tangential question… </div>
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Makoto says, " I tend to include them [EOG channels]. If you exclude them, you typically find no frontal ICs”. There seems to be a common understanding that using ICA to correct for eye movements is OK if you are primarily interested in posterior EEG, but that
ICA eye movement correction is problematic when interested in frontal EEG because ICA cannot clearly separate frontal activity from eye activity. This logically follows from Makoto’s comment, but does anybody know of actual references, which demonstrate that
ICA eye movement correction is OK if interested in posterior EEG, but not OK if interested in frontal EEG?
<div class="">thanks</div>
<div class="">Tim<br class="">
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<div class="">On May 10, 2017, at 10:22 AM, Arnaud Delorme <<a href="mailto:arno@ucsd.edu" class="">arno@ucsd.edu</a>> wrote:</div>
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Dear Alessio,
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<div class="">Yes, include the EOG channels but as long as they have the same reference as the scalp channels. Otherwise, do not include them.</div>
<div class="">Best wishes,</div>
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<div class="">Arno</div>
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<div class="">On May 10, 2017, at 7:33 AM, Makoto Miyakoshi <<a href="mailto:mmiyakoshi@ucsd.edu" class="">mmiyakoshi@ucsd.edu</a>> wrote:</div>
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<div dir="ltr" class="">Dear Alessio,
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<div class="">Getting back to you after 3 month!</div>
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<div class="">> how to deal with ICs where EOG contributes for example for 20%, or 40%, or 60%?<br class="">
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<div class="gmail_extra">This is a good question.</div>
<div class="gmail_extra">Usually EOG is decomposed well, so the result is rather black and white. You can reduce it by optimizing settings (using proper preprocessing and parameters.) </div>
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<div class="gmail_extra">However, sometimes this mixture of brain EEG and non-brain artifact happens. In this case, you are forced to choose either false positive (include them) or false negative (exclude them). I tend to include them. If you exclude them,
you typically find no frontal ICs.</div>
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<div class="gmail_extra">Makoto</div>
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<div class="gmail_quote">On Sun, Feb 12, 2017 at 1:31 AM, Alessio Matiz <span dir="ltr" class="">
<<a href="mailto:muec@inbox.com" target="_blank" class="">muec@inbox.com</a>></span> wrote:<br class="">
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Very dear EEGLAB-list,<br class="">
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is it correct to fit dipoles (via DIPFIT2-plugin) to ICs that have been found including EOG channel in the ICA decomposition (as Arno suggested in
<a href="https://sccn.ucsd.edu/pipermail/eeglablist/2007/001801.html" rel="noreferrer" target="_blank" class="">
https://sccn.ucsd.edu/pipermai<wbr class="">l/eeglablist/2007/001801.html</a>)<wbr class="">?<br class="">
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From my datasets I removed ICs where EOG channel contributes for >90% of IC power (considering them artifactual ICs), but how to deal with ICs where EOG contributes for example for 20%, or 40%, or 60%?<br class="">
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Thanks,<br class="">
Alessio<br class="">
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-- <br class="">
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<div dir="ltr" class="">Makoto Miyakoshi<br class="">
Swartz Center for Computational Neuroscience<br class="">
Institute for Neural Computation, University of California San Diego<br class="">
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