Hi Jonathan,<div><br></div><div>This indeed looks like a bleeding in of the 0Hz component. How did you exactly follow the help on the wiki? Could you post your entire analysis pipeline? (i.e. your call to ft_preprocessing, your call to ft_singleplotTFR, baselining that you do, etc.). That would help in diagnosing the problem.</div>
<div><br></div><div>All the best,</div><div>Roemer</div><div><br><br><div class="gmail_quote">On Fri, Oct 19, 2012 at 1:23 PM, Jonathan Schubert <span dir="ltr"><<a href="mailto:jonathan.schubert@uni-hamburg.de" target="_blank">jonathan.schubert@uni-hamburg.de</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Dear all,<br><br>I have a question regarding frequency analysis using the multitaper approach. I transformed my data using the following code:<br>
<br> cfg = [];<br> cfg.channel = 'all';<br>
cfg.output = 'pow';<br> cfg.method = 'mtmconvol';<br> cfg.foi = 40:1:100;<br> cfg.toi = -1.0:0.02:1.0;<br> cfg.t_ftimwin = 7./cfg.foi;<br> cfg.tapsmofrq = cfg.foi*0.4;<br>
cfg.pad = 'maxperlen';<br> cfg.keeptrials = 'no';<br> freq = ft_freqanalysis(cfg, data);<br><br>When I plot the TFR it looks strange in a similiar way to what I found on the fieldtrip homepage: <a href="http://fieldtrip.fcdonders.nl/faq/why_does_my_tfr_look_strange" target="_blank">http://fieldtrip.fcdonders.nl/faq/why_does_my_tfr_look_strange</a> <br>
Following the help on the homepage did not improve the outcome. I attached an example of my TFR.<br><br>What can I do to improve the outcome of the frequency analysis?<br><br>Best,<br>Jonathan<br><br>
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van der Meij M.Sc.<br>
PhD Candidate<br>
Donders Institute for Brain, Cognition and Behaviour<br>
Centre for Cognition<br>
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E-mail: <a href="mailto:r.vandermeij@donders.ru.nl" target="_blank">r.vandermeij@donders.ru.nl</a></font></font></font><div style="padding:0px;margin-left:0px;margin-top:0px;overflow:hidden;word-wrap:break-word;color:black;font-size:10px;text-align:left;line-height:130%">
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