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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Hi JanMathijs,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Thank you, sorry that I did not read your statement correctly about the baseline correction. I added ft_freqbaseline function between
ft_freqanalysis and ft_multiplotTFR and I’m seeing a lot more detail of activation across time and frequency now that I’m not having the plot function perform the baseline. Attached is the new image set.<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New"">cfg = [];</span><span style="font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.output = 'pow'; %return power spectra</span><span style="font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.channel = 'all';</span><span style="font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.method = 'wltconvol';
</span><span style="font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.width = 1; % 3 has shown some promise for results</span><span style="font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.gwidth = 4; %decreasing this has shown to fill out are of the figure</span><span style="font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.pad = 20; %increases resolution as the value goes up</span><span style="font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.foilim = [1 30]; %1 to 30 Hz range</span><span style="font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.toi = -.05:0.00001:.250; %time window from -50 ms to 250ms in 0.01ms steps</span><span style="font-family:"Courier New""><o:p></o:p></span></p>
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</span><span style="font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> TFRwavelet = ft_freqanalysis(cfg, EEG_Data_Trial);</span><span style="font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> cfg = [];</span><span style="font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.baseline = 'yes';</span><span style="font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.baselinetype = 'relchange';</span><span style="font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> [freq] = ft_freqbaseline(cfg, TFRwavelet)</span><span style="font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""></span><span style="font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> cfg = [];</span><span style="font-family:"Courier New""><o:p></o:p></span></p>
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</span><span style="font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.maskstyle = 'saturation';</span><span style="font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.zlim = 'maxmin';</span><span style="font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.layout = 'ordered';</span><span style="font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.showlabels = 'yes';</span><span style="font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.showoutline = 'yes';</span><span style="font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> [EEG_Spec] = ft_multiplotTFR(cfg, freq);</span><span style="font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">I really appreciate the help.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Kind Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Daniel C.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> fieldtrip <fieldtrip-bounces@science.ru.nl>
<b>On Behalf Of </b>Schoffelen, J.M. (Jan Mathijs)<br>
<b>Sent:</b> 19 June 2019 14:40<br>
<b>To:</b> FieldTrip discussion list <fieldtrip@science.ru.nl><br>
<b>Subject:</b> Re: [FieldTrip] Issue with visualising EEG Spectrogram<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Daniel, it looks as if the baseline correction is not applied. You’d need to specify cfg.baseline = ‘yes’ in order to achieve this.
<o:p></o:p></p>
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<p class="MsoNormal">Note also, that I again recommend to do the baseline correction in a separate step, not asking the plotting function to do it.<o:p></o:p></p>
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<p class="MsoNormal">Recursive baseline corrections with a ‘relchange’ may be problematic, since at some point you start dividing by 0.<o:p></o:p></p>
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<p class="MsoNormal">Best,<o:p></o:p></p>
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<p class="MsoNormal">JanMathijs<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><br>
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<o:p></o:p></p>
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<p class="MsoNormal">On 19 Jun 2019, at 14:15, Daniel Campoy (CMP - Student) <<a href="mailto:D.Campoy@uea.ac.uk">D.Campoy@uea.ac.uk</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Hi Jan-Mathijs,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Thank you for replying back to me. I made the suggested changes and I’m seeing better results as the majority of the area is not as blue and on some of the channels I’m seeing
a more defined shaped. In case you are interested I attached the new results. Overall I’m satisfied with the results and see in come trials a more clearer response.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">I added a couple questions to two of your suggestions below.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">This is the new block of code as well. <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">cfg = [];</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.output = 'pow'; %return power spectra</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.channel = 'all';</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.method = 'wltconvol'; </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> %cfg.trials = trigger_idx; %specify index location to find event in EEG_Data_Trial.trial</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.width = 1; % 3 has shown some promise for results</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.gwidth = 4; %decreasing this has shown to fill out are of the figure</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.pad = 20; %increases resolution as the value goes up</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.foilim = [1 30]; %1 to 30 Hz range</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> %cfg.toi = -.10:0.0001:.35; %produced a full image time window from -100 ms to 350ms in 0.1ms steps</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.toi = -.05:0.00001:.250; %time window from -50 ms to 250ms in 0.01ms steps</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> TFRwavelet = ft_freqanalysis(cfg, EEG_Data_Trial);</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> fprintf('\n Time-Freq wavelet for trigger index %u channel %s and processed %u trigger(s)\n',trigger_idx(i),channels{z},i)</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> %Create Image of EEG Spectrogram to output cdat matrix</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> cfg = [];</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> %cfg.baselinetype = 'relchange';</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.maskstyle = 'saturation';</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.zlim = 'maxmin';</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.layout = 'ordered';</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.showlabels = 'yes';</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.showoutline = 'yes';</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> %subplot(2,4,z)%used to create figures of plotted channels</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> [EEG_Spec] = ft_multiplotTFR(cfg, TFRwavelet);</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal">1 a). You can run ft_freqanalysis for all channels at once (without the for-loop)<span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"> <span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal">From my understanding if I supply all channels for ft_freqanalysis and use ft_singleplotTFR then this will show one plot for a trial with an average across all the channels (in my case 8).<span class="apple-converted-space"> </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"> <span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal">1 b). You may want to use cfg.method = ‘wltconvol’ for ft_freqanalysis, rather than ‘wavelet’ , since it’s much faster with equivalent results.<span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"> <span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal">2). Next, you can call ft_freqbaseline (again: only once, and perhaps use ‘relchange’ as a method) to ‘baseline correct' the spectrograms.<span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"> <span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal">What are the consequences of running this more than once?<span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"> <span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal">3). Next, you can use ft_multiplotTFR on the baseline corrected variable, using a cfg.layout = ‘ordered’, and don’t specify any baseline correction options here.<span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">If I use ft_singleplotTFR again would you recommend I omit the baseline parameter too?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">I also want to add that when performing ft_freqanalysis I’m seeing these messages “Warning: output time-bins are different from input time-bins, multiples of the sametrial”
for all my trails processing. When I’m looking at the trial cell data type and looking at the maxtrix defined inside their numbers are not same. I was not able to find much information as to exactly how this is triggered. I did find the line of code the produces
this but not entirely sure why it is triggered. Is this message typically ignored?<span class="apple-converted-space"> </span><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Kind Regards,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Daniel C.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><a name="_olk_signature"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Sent from<span class="apple-converted-space"> </span></span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><a href="https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgo.microsoft.com%2Ffwlink%2F%3FLinkId%3D550986&data=02%7C01%7CD.Campoy%40uea.ac.uk%7Cceb777a35f6c42538daf08d6f4bc3841%7Cc65f8795ba3d43518a070865e5d8f090%7C0%7C0%7C636965486572083954&sdata=tg81Kk8Ho0NnveTgFKTvoRsZtiTJ9xF1%2B05afgc%2BeGA%3D&reserved=0"><span style="color:#954F72">Mail</span></a><span class="apple-converted-space"> </span>for
Windows 10<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span class="apple-converted-space"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">fieldtrip
<<a href="mailto:fieldtrip-bounces@science.ru.nl"><span style="color:#954F72">fieldtrip-bounces@science.ru.nl</span></a>> on behalf of Schoffelen, J.M. (Jan Mathijs) <<a href="mailto:jan.schoffelen@donders.ru.nl"><span style="color:#954F72">jan.schoffelen@donders.ru.nl</span></a>><br>
<b>Sent:</b><span class="apple-converted-space"> </span>Wednesday, June 19, 2019 10:24:23 AM<br>
<b>To:</b><span class="apple-converted-space"> </span>FieldTrip discussion list<br>
<b>Subject:</b><span class="apple-converted-space"> </span>Re: [FieldTrip] Issue with visualising EEG Spectrogram<o:p></o:p></span></p>
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<p class="MsoNormal">Hi Daniel,<span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal">May I suggest you to do 4 things, rather than trying to really understand why no apparent baselining seems to have been applied.<span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"> <span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal">1 a). You can run ft_freqanalysis for all channels at once (without the for-loop)<span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal">1 b). You may want to use cfg.method = ‘wltconvol’ for ft_freqanalysis, rather than ‘wavelet’ , since it’s much faster with equivalent results.<span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal">2). Next, you can call ft_freqbaseline (again: only once, and perhaps use ‘relchange’ as a method) to ‘baseline correct' the spectrograms.<span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal">3). Next, you can use ft_multiplotTFR on the baseline corrected variable, using a cfg.layout = ‘ordered’, and don’t specify any baseline correction options here.<span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"> <span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal">Best wishes,<span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal">Jan-Mathijs<span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"> <span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal">On 18 Jun 2019, at 20:12, Daniel Campoy (CMP - Student) <<a href="mailto:D.Campoy@uea.ac.uk"><span style="color:#954F72">D.Campoy@uea.ac.uk</span></a>> wrote:<span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"> <span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Hello,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">I have been stuck trying to understand the results I’m seeing so please forgive me as my background is not in neuroscience. I’m a Masters student working with EEG data for
a classification project using Matlab 2017b.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">I have been successful at visualising the data of a test subject for a specific trigger and plot all channels (dataset has 8 channels) from the trigger (image stimuli) using
ft_singleplotTFR. Thus creating a 2x4 plot of images for all 8 channels. However I’m stuck trying understand my results when I plot an EEG spectrogram using ft_singleplotTFR for each channel across all triggers (T=1 in my dataset) the data does not show what
I’ve seen for separate channels. It displays a plot of 8 images filled blue and a fine yellow/green bar across the bottom. The only thing I’ve changed is supplying all the trials instead of one at a time using a for loop to iterate through each trial for
8 channels. I’ve removed the for loop outside of the for loop of channels since I’m supplying all trials. Below is my code and process. Any insight would be much appreciated and if you need further information please let me know. I’ve attached an image of
the results of each channel across all triggers.<span class="apple-converted-space"> </span><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">My first step is to load the .mat file I’ve saved containing all the defined trials. After this is complete, the below code is used to extract all the trigger events where
the value in cfg.events is T=1. I run the ft_</span><span style="font-size:10.0pt;font-family:"Courier New"">preprocessing</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">again but for the defined trials I’m looking for T=1.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">trigger = extractfield(cfg.event,<span style="color:#A020F0">'value'</span>);</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">channels = EEG_Data.cfg.channel;</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">trigger_idx = find(startsWith(trigger,<span style="color:#A020F0">'T=1'</span>));</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">cfg.trials = trigger_idx;<span class="apple-converted-space"> </span><span style="color:forestgreen">%index location for all T=1 stimuli triggers</span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">EEG_Data_Trial = ft_preprocessing(cfg,EEG_Data);</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">After completion the next block of code is ran for each channel. You may have noticed the cdat variable is in the output, this is me modifying the ft_singleplotTFR function
to return the EEG spectrogram matrix I use for later analysis.<span class="apple-converted-space"> </span><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">figure<span class="apple-converted-space"> </span><span style="color:forestgreen">%used to create a figure of EEG Spectrograms</span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:blue">for</span><span class="apple-converted-space"><span style="font-size:10.0pt;font-family:"Courier New""> </span></span><span style="font-size:10.0pt;font-family:"Courier New"">z
= 1:length(channels)<span class="apple-converted-space"> </span><span style="color:forestgreen">%Collect the measurements from each channel for a given trigger</span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> Img_idx = 1 + Img_idx;</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> cfg = [];</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.output =<span class="apple-converted-space"> </span><span style="color:#A020F0">'pow'</span>;<span class="apple-converted-space"> </span><span style="color:forestgreen">%return
power spectra</span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.channel = channels{z};</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.method =<span class="apple-converted-space"> </span><span style="color:#A020F0">'wavelet'</span>;<span class="apple-converted-space"> </span><span style="color:forestgreen">%use
wavelet function</span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> <span class="apple-converted-space"> </span><span style="color:forestgreen">%cfg.trials = trigger_idx; %specify index location to find event in EEG_Data_Trial.trial</span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.width = 1;<span class="apple-converted-space"> </span><span style="color:forestgreen">% 3 has shown some promise for results</span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.gwidth = 4;<span class="apple-converted-space"> </span><span style="color:forestgreen">%decreasing this has shown to fill out are of the figure</span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.pad = 20;<span class="apple-converted-space"> </span><span style="color:forestgreen">%increases resolution as the value goes up</span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.foilim = [1 30];<span class="apple-converted-space"> </span><span style="color:forestgreen">%1 to 30 Hz range</span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> <span style="color:forestgreen">%cfg.toi = -.10:0.0001:.35; %produced a full image time window from -100 ms to 350ms in 0.1ms steps</span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.toi = -.05:0.00001:.250;<span class="apple-converted-space"> </span><span style="color:forestgreen">%time window from -50 ms to 250ms in 0.01ms steps</span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> TFRwavelet = ft_freqanalysis(cfg, EEG_Data_Trial);</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> fprintf(<span style="color:#A020F0">'\n Time-Freq wavelet for trigger index %u channel %s and processed %u trigger(s)\n'</span>,trigger_idx(i),channels{z},i)</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> <span class="apple-converted-space"> </span><span style="color:forestgreen">%Create Image of EEG Spectrogram to output cdat matrix</span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> cfg = [];</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.baselinetype =<span class="apple-converted-space"> </span><span style="color:#A020F0">'absolute'</span>;</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.maskstyle =<span class="apple-converted-space"> </span><span style="color:#A020F0">'saturation'</span>;</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> cfg.zlim = <span class="apple-converted-space"> </span><span style="color:#A020F0">'maxmin'</span>;</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> subplot(2,4,z)<span style="color:forestgreen">%used to create figures of plotted channels</span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> [EEG_Spec,cdat] = ft_singleplotTFR(cfg, TFRwavelet);</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> subplot(2,4,z)<span style="color:forestgreen">%used to create figures of plotted channels</span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:blue">end</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Thank you and kind regards,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Daniel C.<o:p></o:p></span></p>
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<p class="MsoNormal"><OneSub_acrossTrails_T1.png><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif">_______________________________________________<br>
fieldtrip mailing list<br>
</span><a href="https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmailman.science.ru.nl%2Fmailman%2Flistinfo%2Ffieldtrip&data=02%7C01%7CD.Campoy%40uea.ac.uk%7Cceb777a35f6c42538daf08d6f4bc3841%7Cc65f8795ba3d43518a070865e5d8f090%7C0%7C0%7C636965486572093958&sdata=OAQIp0ZPne5jKOG%2FZfWA64S%2BtRwTqO%2FHEyu83JcrPFA%3D&reserved=0"><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif;color:#954F72">https://mailman.science.ru.nl/mailman/listinfo/fieldtrip</span></a><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif"><br>
</span><a href="https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdoi.org%2F10.1371%2Fjournal.pcbi.1002202&data=02%7C01%7CD.Campoy%40uea.ac.uk%7Cceb777a35f6c42538daf08d6f4bc3841%7Cc65f8795ba3d43518a070865e5d8f090%7C0%7C0%7C636965486572103975&sdata=OcCfSqAAnTFAkFtqByp9ySWis2JvsOlqVgtQCaEZY3g%3D&reserved=0"><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif;color:#954F72">https://doi.org/10.1371/journal.pcbi.1002202</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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</blockquote>
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<p class="MsoNormal"> <span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><10HzSub02a_T1_All_Trials.png><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif">_______________________________________________<br>
fieldtrip mailing list<br>
</span><a href="https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmailman.science.ru.nl%2Fmailman%2Flistinfo%2Ffieldtrip&data=02%7C01%7CD.Campoy%40uea.ac.uk%7Cceb777a35f6c42538daf08d6f4bc3841%7Cc65f8795ba3d43518a070865e5d8f090%7C0%7C0%7C636965486572103975&sdata=GI%2Fq7ZakEjArOtXC1gzb18itK3IZYZiGk3KpjEU%2B0tE%3D&reserved=0"><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif;color:#954F72">https://mailman.science.ru.nl/mailman/listinfo/fieldtrip</span></a><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif"><br>
</span><a href="https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdoi.org%2F10.1371%2Fjournal.pcbi.1002202&data=02%7C01%7CD.Campoy%40uea.ac.uk%7Cceb777a35f6c42538daf08d6f4bc3841%7Cc65f8795ba3d43518a070865e5d8f090%7C0%7C0%7C636965486572113979&sdata=OOBbW7o%2BULlYJsZHmh%2F3g9DzDKAGpzMmrA6vR5tIFgI%3D&reserved=0"><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif;color:#954F72">https://doi.org/10.1371/journal.pcbi.1002202</span></a><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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