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<p class="MsoNormal">Dear FieldTrippers,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am facing a problem with ft_freqanalysis which has already been reported here in the mailing list but not clear and definite answer/solution has been given so far.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am working with resting-state eeg, 3 minutes eyes closed which I divide in epochs of 1 sec each, I preprocess and carefully visually inspect to discard any artefact. When channels are noisy I use ft_repairchannel with the method triangulation
to repair them. I am focusing only on the right and left motor areas, plus the middle line electrodes.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I would like to analyse the signals in the time-frequency domain, thus once the data are all preprocessed and cleaned (contained in the structure DataOut_Rep) I perform an analysis with Morlet wavelet. Below there is my code:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:"Courier New";color:black">cfg = [];</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:"Courier New";color:black">cfg.channel = {</span><span style="font-size:12.0pt;font-family:"Courier New";color:#A020F0">'all'</span><span style="font-size:12.0pt;font-family:"Courier New";color:black">
</span><span style="font-size:12.0pt;font-family:"Courier New";color:#A020F0">'-HEOG'</span><span style="font-size:12.0pt;font-family:"Courier New";color:black">
</span><span style="font-size:12.0pt;font-family:"Courier New";color:#A020F0">'VEOG'</span><span style="font-size:12.0pt;font-family:"Courier New";color:black">};</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:"Courier New";color:black">cfg.foi = 3:1:45;</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:"Courier New";color:black">cfg.toi = 0:0.001:1;</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:"Courier New";color:black">cfg.output =
</span><span style="font-size:12.0pt;font-family:"Courier New";color:#A020F0">'pow'</span><span style="font-size:12.0pt;font-family:"Courier New";color:black">;</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:"Courier New";color:black">cfg.method =
</span><span style="font-size:12.0pt;font-family:"Courier New";color:#A020F0">'wavelet'</span><span style="font-size:12.0pt;font-family:"Courier New";color:black">;</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:"Courier New";color:black">cfg.width = 7;</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:"Courier New";color:black">cfg.t_ftimwin = ones(length(cfg.foi),1).*0.5;</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:"Courier New";color:black">TFR = ft_freqanalysis(cfg, DataOut_Rep);</span><span style="font-size:12.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Here is an example of dataset (this in particular is baseline, resting state before any task is performed):<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><a href="https://www.dropbox.com/s/6fqmn6i9mju75sq/DM_RepairRerefData_Fam.mat?dl=0">https://www.dropbox.com/s/6fqmn6i9mju75sq/DM_RepairRerefData_Fam.mat?dl=0</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am facing 2 problems with the output of ft_freqanalysis:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">1)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>I have a lot of NaNs: TFR.powspctrm is made of 29 (channels) x 43 (frequencies) x 1001 (time points), and in several position I have NaN values.<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">2)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>When I use ft_topoplotTFR, the plots of some frequency bands (e.g. Beta, 13-30 Hz) have super high values, up to hundreds or thousands.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Has anybody any idea of why this happens?! In case, does also anyone have a potential solution to overcome this issue?!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thank you!<o:p></o:p></p>
<p class="MsoNormal">Sara<o:p></o:p></p>
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