<div>i would start by looking over some of the relevant papers, available at the eeglab website, makeig's homepage and jung's homepage</div>
<div> </div>
<div>eg, </div>
<div> </div>
<div><a href="http://www.sccn.ucsd.edu/~jung/pdf/PSY00.pdf">http://www.sccn.ucsd.edu/~jung/pdf/PSY00.pdf</a></div>
<div>fig2a/b {19 eeg, 1 ear and 2 eog channels before/after ica-filtering w ICs}<br><br></div>
<div class="gmail_quote">On Mon, Mar 24, 2008 at 7:58 AM, Edward Justin Modestino, M.Phil. <<a href="mailto:modestino@ccs.fau.edu">modestino@ccs.fau.edu</a>> wrote:<br>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">O.K., I guess it was too ignorant of a question and that is why nobody<br>answered me. I will assume that if ICA truly does remove the component<br>
associated with the eye movements, that the EOG channels will be<br>relatively flat. Of course, I can confirm this by doing so.<br><br>Furthermore, I have not looked into the exact filtering options in EEGLAB<br>in detail. I guess I can always try to find the mathematics behind an<br>
acausal FIR filter if this does not already exist in EEGLAB and just<br>create it and filter it on my own.<br><br>Thanks!<br>---------------------------- Original Message ----------------------------<br>Subject: [Eeglablist] [Fwd: Eye Movement Artifacts and Filtering]<br>
From: "Edward Justin Modestino, M.Phil." <<a href="mailto:modestino@ccs.fau.edu">modestino@ccs.fau.edu</a>><br>Date: Fri, March 14, 2008 1:18 pm<br>To: <a href="mailto:eeglablist@sccn.ucsd.edu">eeglablist@sccn.ucsd.edu</a><br>
--------------------------------------------------------------------------<br><br>Can someone please respond to my queries below, someone who knows perhaps<br>from the EEGLAB creators, about EOG channels in EEGLAB, using ICA to<br>
remove eye artifacts, etc. I need to know if I should format my data to<br>include the EOG channels or not, this has put me on hold. Also, I need to<br>know that ICA will not see the EOG channels as EEG channels. If I truly<br>
remove the eye movement artifacts using ICA, the EOG channel averages<br>should be relatively flat or reasonably free of eye movements. My advisor<br>will want me to include them to be able to show the EOG channel averages<br>
are clean. But, if this will not work, I am unsure what to do.<br><br>Thanks!<br><br>---------------------------- Original Message ----------------------------<br>Subject: [Eeglablist] Eye Movement Artifacts and Filtering<br>
From: "Edward Justin Modestino, M.Phil." <<a href="mailto:modestino@ccs.fau.edu">modestino@ccs.fau.edu</a>><br>Date: Mon, March 10, 2008 10:41 am<br>To: <a href="mailto:eeglablist@sccn.ucsd.edu">eeglablist@sccn.ucsd.edu</a><br>
--------------------------------------------------------------------------<br><br>Hello,<br>I am planning to use ICA in EEGLAB to remove eye movement artifacts. I<br>know that ICA does not use EOG channels locate the component associated<br>
with eye movements. However, my advisor will want me to show ERP averages<br>of the EOG channels as evidence that the eye movements have been removed<br>using ICA. So, I will be including the EOG channels (bipolar, but<br>
represented as individual difference waves as one channel, for HEO and<br>VEO).<br><br>So, first I need to make sure that there is a way to use the EOG channels<br>with appropriate locations in the location file. Second, I need to show<br>
via averages of the eye movement channels that eye movements have been<br>removed by ICA. If I have the EOG channels in the array of EEG channels,<br>will EEGLAB running ICA see these as EEG channels or EOG channels? Or<br>
does this matter? My fear is that EEGLAB using ICA may see the EOG<br>channels as EEG channels and thus not see all the eye movement artifact<br>contributions as truly that, but perhaps part of an EEG ERP components,<br>and thus leave them in!<br>
<br>Finally, I need to run an acausal FIR high pass filter at 1 Hz. [which<br>will not change the temporal components of the EEG] on the data before<br>running ICA, as there is an extreme trend in the data that made automated<br>
and even manual eye movement removal inadequate using the raw data outside<br>of EEGLAB. Also, the trend needs to be removed anyway. However, removing<br>the linear trend will not adequately alter the tend in the continuous data<br>
as the FIR filter will. So, I wish to use such a filter. [I may remove<br>the linear trend once the data is epoched per condition, but not on the<br>continuous data.] What sort of filters does EEGLAB have built in? Is this<br>
filter already available?<br><br>Thanks,<br>Ed<br><br>---------------------------------------------------<br>Edward Justin Modestino, M.Phil.<br>Ph.D. Candidate in Complex Systems and Brain Sciences<br>Cognitive Neurodynamics Laboratory<br>
Center for Complex Systems and Brain Sciences<br>Florida Atlantic University<br>(561) 297-2238<br>Fax: (561) 297-3634<br><a href="mailto:modestino@ccs.fau.edu">modestino@ccs.fau.edu</a><br><a href="http://www.ccs.fau.edu/~modestino/" target="_blank">http://www.ccs.fau.edu/~modestino/</a><br>
Lab: <a href="http://www.ccs.fau.edu/~bressler/CNL_CCSBS/CNL_CCSBS_FAU.html" target="_blank">http://www.ccs.fau.edu/~bressler/CNL_CCSBS/CNL_CCSBS_FAU.html</a><br>---------------------------------------------------<br>_______________________________________________<br>
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Edward Justin Modestino, M.Phil.<br>Ph.D. Candidate in Complex Systems and Brain Sciences<br>Cognitive Neurodynamics Laboratory<br>Center for Complex Systems and Brain Sciences<br>Florida Atlantic University<br>(561) 297-2238<br>
Fax: (561) 297-3634<br><a href="mailto:modestino@ccs.fau.edu">modestino@ccs.fau.edu</a><br><a href="http://www.ccs.fau.edu/~modestino/" target="_blank">http://www.ccs.fau.edu/~modestino/</a><br>Lab: <a href="http://www.ccs.fau.edu/~bressler/CNL_CCSBS/CNL_CCSBS_FAU.html" target="_blank">http://www.ccs.fau.edu/~bressler/CNL_CCSBS/CNL_CCSBS_FAU.html</a><br>
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</blockquote></div><br><br clear="all"><br>-- <br>Alexander J. Shackman<br>Laboratory for Affective Neuroscience<br>Waisman Laboratory for Brain Imaging & Behavior<br>University of Wisconsin-Madison<br>1202 West Johnson Street<br>
Madison, Wisconsin 53706<br><br>Telephone: +1 (608) 358-5025<br>FAX: +1 (608) 265-2875<br>EMAIL: <a href="mailto:shackman@wisc.edu">shackman@wisc.edu</a><br><a href="http://psyphz.psych.wisc.edu/~shackman">http://psyphz.psych.wisc.edu/~shackman</a><br>
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