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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222;background:white">Dear all,</span><o:p></o:p></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222">My data (that are recorded with a neuromag306 system) look vertically smeared after sourceanalysis (see attached picture). The sources
look like columns. The location (when plotted with method 'surface') looks comparable to the sensor analysis so I am not worried about that. <o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222">The noise projection (cfg.dics.lambda) is something that I have been playing around with, but other then 'nai amplitude' de- or increases,
this does not change the sources 'verticallness'. This indicates to me that this might be the problem... <o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222">I am wondering if any of you has an idea where I should look to find a solution. <o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222">Further information:<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222">I am using a mni-normalised headmodel such as described on the site: <a href="http://fieldtrip.fcdonders.nl/example/create_single-subject_grids_in_individual_head_space_that_are_all_aligned_in_mni_space" target="_blank"><span style="color:#1155CC">http://fieldtrip.fcdonders.nl/example/create_single-subject_grids_in_individual_head_space_that_are_all_aligned_in_mni_space</span></a> but
adapted to the neuromag system (I will make changes to the specific site :-) ).<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222">Then compute the fourier, and do sourceanalysis as follows:<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222">cfg = [];<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222">cfg.method = 'dics';<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222">cfg.grid = mni_grid;<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222">cfg.grid.filter = source.avg.filter; % precomputed filter and leadfield to project all trials through the same filter<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222">cfg.grid.leadfield = source.leadfield;<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222">cfg.vol = ft_convert_units(mni_vol,'mm'); % this step is needed somehow...<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222">cfg.vol.unit = 'cm';<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222">cfg.frequency = 60;<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222">cfg.latency = 3;<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222">cfg.dics.projectnoise = 'yes';<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222">cfg.dics.lambda = '0.05%';<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222">cfg.dics.normalize = 'yes';<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222">cfg.keeptrials = 'yes';<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222">cfg.rawtrial = 'yes'; % project each single trial through the filter<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222">s = ft_sourceanalysis(cfg, f);<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222">Thanks in advance for any suggestion!<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222">Groetjes Hanneke<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt">__________________________________________<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt">Hanneke van Dijk, PhD<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE" style="font-size:9.0pt"><a href="http://www.uniklinik-duesseldorf.de/deutsch/unternehmen/institute/KlinNeurowiss/Team/HannekevanDijk/page.html"><span lang="EN-US" style="color:blue">http://www.uniklinik-duesseldorf.de/deutsch/unternehmen/institute/KlinNeurowiss/Team/HannekevanDijk/page.html</span></a></span><span style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt">Institute for Clinical Neuroscience,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt">Heinrich Heine Universit</span><span lang="DE" style="font-size:9.0pt">ä</span><span style="font-size:9.0pt">t D</span><span lang="DE" style="font-size:9.0pt">ü</span><span style="font-size:9.0pt">sseldorf,
Germany<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt"><a href="mailto:Hanneke.vanDijk@med.uni-duesseldorf.de">Hanneke.vanDijk@med.uni-duesseldorf.de</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt">Tel. +49 (0) 211 81 13074 <o:p>
</o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt">__________________________________________
<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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