<div dir="ltr">Hello Luisa,<div><br></div><div>As for the top right panel of that plot, what that plots is the ICA's amplitude per trial, and the ERP. So I imagine you can't get those when you're not using epoched data (although I haven't tried myself). </div>
<div><br></div><div>I'm not sure about the issue with the head maps; my hunch is that it might not be possible to get good topoplots without more channels, but hopefully someone else more familiar with that issue can give you some more input.</div>
<div><br></div><div>Best,</div><div>Steve</div></div><div class="gmail_extra"><br clear="all"><div><div dir="ltr"><div><br><br></div>Stephen Politzer-Ahles<br>New York University, Abu Dhabi<br>Neuroscience of Language Lab<br>
<a href="http://www.nyu.edu/projects/politzer-ahles/" target="_blank">http://www.nyu.edu/projects/politzer-ahles/</a><br></div></div>
<br><br><div class="gmail_quote">On Thu, May 15, 2014 at 3:37 AM, Luisa Roeder <span dir="ltr"><<a href="mailto:l.roeder@qut.edu.au" target="_blank">l.roeder@qut.edu.au</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div>
<p class="MsoNormal">Hi all,<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I have been following the EEGLAB discussion list for a few weeks now and have been working through most of the tutorials and wiki pages but I am still a newbie to MATLAB, EEGLAB and analysing EEG signals in general. Hence, I have basic,
newbie questions which I hope you can help me with.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal" style="margin-left:36.0pt;text-autospace:none">
I am trying to follow the analysis steps that are outlined in this paper: <span style="font-size:9.0pt;font-family:"Segoe UI","sans-serif"">
Petersen, T.H., M. Willerslev-Olsen, B.A. Conway, and J.B. Nielsen, <i>The motor cortex drives the muscles during walking in human subjects.</i> The Journal of physiology, 2012.
<b>590</b>(Pt 10): p. 2443-52.<u></u><u></u></span></p>
<p class="MsoNormal"><a href="http://www.ncbi.nlm.nih.gov/pubmed/?term=1.%09Petersen%2C+T.H.%2C+M.+Willerslev-Olsen%2C+B.A.+Conway%2C+and+J.B.+Nielsen%2C+The+motor+cortex+drives+the+muscles+during+walking+in+human+subjects.+The+Journal+of+physiology%2C+2012.+590%28Pt+10%29%3A+p.+2443-52" target="_blank">http://www.ncbi.nlm.nih.gov/pubmed/?term=1.%09Petersen%2C+T.H.%2C+M.+Willerslev-Olsen%2C+B.A.+Conway%2C+and+J.B.+Nielsen%2C+The+motor+cortex+drives+the+muscles+during+walking+in+human+subjects.+The+Journal+of+physiology%2C+2012.+590%28Pt+10%29%3A+p.+2443-52</a>.
<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">At the moment I am looking at a continuous dataset that contains 6 EEG and 6 EMG channels and that was recorded during a sustained muscle contraction of the leg. Eventually I also want to look at gait data but I am not there yet.
<u></u><u></u></p>
<p class="MsoNormal">As outlined in the paper, I am trying to perform ICA (runica) on the EEG channels. After I ran the ICA, I want to remove unwanted components (in the gui) via Tools->reject data using ICA-> reject components by map. However, since I only
recorded 6 channels (C3, Cz, C4, F3, Fz, F4) the head maps I receive only cover the region between the 6 electrodes but not the whole head. Also, when clicking on one component the top right panel that is supposed to show the activity of the component is empty<span style="color:#1f497d">.
<u></u><u></u></span></p>
<p class="MsoNormal">Here is a link to 2 images: <span style="color:#1f497d"><a href="https://www.dropbox.com/sh/t5b8kmb9b9ce93e/AAC5VyeSEQbob0PTSiSZ61Ita" target="_blank">https://www.dropbox.com/sh/t5b8kmb9b9ce93e/AAC5VyeSEQbob0PTSiSZ61Ita</a>
</span><u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">This does not provide sufficient information to be able to judge whether to keep or to discard a component.
<u></u><u></u></p>
<p class="MsoNormal">What can I do to fix the problem? Is there another/better/more appropriate way to remove artefacts from my data than this approach? Or is the only way recording more channels (32+?) so that I can plot sufficient head maps?<u></u><u></u></p>
<p class="MsoNormal">Currently I use MATLAB R2012a and EEGLAB v10.2.5.8b.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Thanks so much in advance for your help!!<u></u><u></u></p>
<p class="MsoNormal">Kind regards<u></u><u></u></p>
<p class="MsoNormal">Luisa<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;color:black">Luisa Roeder</span></b><span style="font-size:10.0pt;color:black"> <b>| PhD researcher | Movement Neuroscience Program</b></span><span style="font-size:12.0pt"><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:black">Institute of Health and Biomedical Innovation & School of Exercise and Nutrition Science</span><span style="font-size:12.0pt"><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:black">Queensland University of Technology | 60 Musk Ave, Kelvin Grove, Brisbane, QLD 4059, Australia.</span><span style="font-size:12.0pt"><u></u><u></u></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;color:black">t:</span></b><span style="font-size:10.0pt;color:black"> <a href="tel:%2B61%207%C2%A03138%206428" value="+61731386428" target="_blank">+61 7 3138 6428</a> |<b> e:
<a href="mailto:l.roeder@qut.edu.au" target="_blank">l.roeder@qut.edu.au</a> </b></span><span style="font-size:12.0pt"><u></u><u></u></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;color:black">w:</span></b><span style="font-size:10.0pt;color:black">
<b><a href="http://www.ihbi.qut.edu.au/about/researchover/injury/movementNeuroscience.jsp" target="_blank"><span style="color:black">www.ihbi.qut.edu.au/about/researchover/injury/movementNeuroscience.jsp</span></a>
</b></span><span style="font-size:12.0pt;color:black"><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;color:black">CRICOS No. 00213J</span><span style="font-size:12.0pt;color:black"><u></u><u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
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