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Dear JM,<br><br>thank you for the hint.<br>I was not aware of this thread in the faqs.<br><br>Removing the DC offset seems to solve the problem indeed.<br>It's funny though, that using<br><br>cfg.demean = 'yes';<br>data = preprocessing(cfg,data);<br><br>did not do the job.<br><br>I had to manually remove the DC with<br><br>data.trial{1} = data.trial{1} - mean(data.trial{1},2);<br><br>to get rid of the problem (see attached figure).<br>But maybe that's because the fieldtrip version I am using is outdated?<br><br>In any case, many thanks for the fast and efficient help.<br><br>Frederic<br><br> </body>
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