Anja - While you look for existing Adjar code, I suggest you trying visualize your data trials using erpimage(), for example sorted by subject reaction time. Then you can see directly 'what' features are time-locked to the stimulus onset, and 'what' to the subject response. Of course, if you visualize the channel data directly, keep in mind that each channel is a weighted sum/difference of several cortical source activities, with little or no sign of 'what' features come from 'which' in the individual channel records. Several examples of using erpimage plotting to explore 'trial-by-trial' data relationships in evoked response data trials are presented the chapter Julie Onton and I wrote last winter for a Steve Luck edited handbook:<br>
<br><a href="http://sccn.ucsd.edu/~scott/pdf/MakeigOnton_ERP09.pdf">http://sccn.ucsd.edu/~scott/pdf/MakeigOnton_ERP09.pdf</a><br><br>In fact, simple Adjar code could be written in Matlab using the outputs of erpimage. A plug-in wouldn't be hard for an experienced Matlab script writer to manage, and might include step-by-step erpimage visualizations. For example, at every iteration, a 2-by-4 matrix of erpimage plots could show<br>
<br>stim-aligned_data stim-aligned_data_ stim-aligned_ERP_data_ resp-aligned_ERP_<br>
with_ERPs_removed removed_from_each_ data_rmd_from_each_<br> stim-aligned_trial stim-aligned_trial<br><br>
resp-aligned_data resp-aligned_data_ stim-aligned_ERP_data_ resp-aligned_ERP_<br>
with_ERPs_removed removed_from_each_trial data_rmd_fr_ea_tr<br> resp-aligned_trial resp-aligned_trial<br><br>Sorry if this is beyond your current ability or outside your interest -- I'm hoping someone on the list<br>
may want to try it...<br><br>Scott Makeig<br><br><br><br>Scott<br><br><div class="gmail_quote">On Tue, Nov 17, 2009 at 9:44 AM, Dr. Anja Ischebeck <span dir="ltr"><<a href="mailto:anja.ischebeck@uni-graz.at">anja.ischebeck@uni-graz.at</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Dear all,<br>
<br>
We am currently trying to use the Adjar technique<br>
(Woldorff, Psychophysiology, 1993),<br>
to deal with overlapping ERP Responses.<br>
However, I am not quite able to wrap my head<br>
around it. Does anybody have some experience<br>
with Adjar? Every bit of script would help us,<br>
just as a demo of what has to be done.<br>
<br>
And of course we could be happy to<br>
learn from your experience and share our<br>
(hopefully) future experiences with that method.<br>
<br>
Any hints and comments are highly welcome<br>
<br>
Anja<br>
<br>
---------------------<br>
Dr. Anja Ischebeck<br>
Institut für Psychologie<br>
Universität Graz<br>
<br>
Universitätsplatz 2/DG, 8010 Graz<br>
Tel: +43 (0) 316 380-8503<br>
E-Mail: <a href="mailto:anja.ischebeck@uni-graz.at">anja.ischebeck@uni-graz.at</a><br>
<a href="http://www.anps.uni-graz.at/anps" target="_blank">http://www.anps.uni-graz.at/anps</a><br>
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</blockquote></div><br><br clear="all"><br>-- <br>Scott Makeig, Research Scientist and Director, Swartz Center for Computational Neuroscience, Institute for Neural Computation, University of California San Diego, La Jolla CA 92093-0961, <a href="http://sccn.ucsd.edu/~scott">http://sccn.ucsd.edu/~scott</a><br>