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<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);" class="elementToProof">
Dear fieldtrip community,</div>
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I'm getting strange results when I compute the powerspectrum of my data with the mtmconvol method.</div>
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When I plot my results over time and frequencies, I get most power in the higher frequencies, compared to the wavelet, tfr, or superlet methods where I get most power in the lower frequencies.</div>
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When I look at just the power over frequencies, it looks like mtmconvol removes 1/f. Is this indeed the case? If so, why does it do this?</div>
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I attached plots of the powerspectrum for the mtmconvol method, superlet method, and superlet method adjusted for 1/f by multiplying the power with the frequency which makes it look a lot more like the mtmconvol results.</div>
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My settings:</div>
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fieldtrip-20220401<br>
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cfg <span> </span><span> </span> = [];</div>
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<div class="ContentPasted1">cfg.output <span> </span><span> </span>= 'pow';</div>
<div class="ContentPasted1">cfg.keeptrials <span> </span><span> </span>= 'yes';</div>
<div class="ContentPasted1">cfg.channel <span> </span><span> </span>= 'all';</div>
<div class="ContentPasted1">cfg.method <span> </span><span> </span>= 'mtmconvol'; /'<span style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); display: inline !important;" class="ContentPasted2">superlet'</span></div>
<div class="ContentPasted1">cfg.taper <span> </span><span> </span>= 'dpss';</div>
<div class="ContentPasted1">cfg.foi <span> </span><span> </span>= 4:.5:100;</div>
<div class="ContentPasted1">cfg.t_ftimwin <span> </span><span> </span>= 7./cfg.foi; </div>
<div class="ContentPasted1">cfg.toi <span> </span><span> </span>= 'all'; </div>
<div class="ContentPasted1">cfg.polyremoval <span> </span><span> </span>= 1; </div>
<div class="ContentPasted1">cfg.pad <span> </span><span> </span>= 11; </div>
<div class="ContentPasted1">cfg.tapsmofrq <span> </span><span> </span>= 0.3.*cfg.foi ; </div>
<div class="ContentPasted1"><br>
</div>
<div class="ContentPasted1">% for 'superlet' method</div>
<div class="ContentPasted1">cfg.width <span> </span><span> </span> = 3; </div>
<div class="ContentPasted1">cfg.gwidth <span> </span><span> </span>= 3; </div>
<div class="ContentPasted1">cfg.combine <span> </span>= 'additive'; <br>
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cfg.order <span> </span><span> </span>= round(linspace(1,40,numel(cfg.foi)));<br>
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ft_freqanalysis(cfg, data);<br>
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I'm grateful for any input.</div>
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Best regards,
<div>Martin</div>
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<font color="#333333" size="1" style=""><span lang="en-US" style="margin:0px"><span style="font-family: Calibri, sans-serif; font-size: 12px; text-align: left; color: rgb(118, 113, 113); background-color: rgb(255, 255, 255); display: inline !important;">------------</span><br>
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<font color="#333333" size="1" style=""><span lang="en-US" style="margin:0px"><b>Martin Schaefer | </b></span></font><span style="font-family:Tahoma; font-size:x-small">PhD Student</span></p>
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<font color="#333333" size="1" style=""><span style="font-family: Tahoma; font-size: x-small; background-color: rgb(255, 255, 255); display: inline !important;"><a href="https://www.perceptionlab.se/">https://www.perceptionlab.se/</a><br>
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<font color="#333333" size="1" style="">Department of Clinical Neuroscience (CNS), K8</font></p>
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<font color="#333333" size="1" style="">Karolinska Institutet | 17 177 Stockholm | Nobels väg 9</font></p>
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<span lang="en-US" style="margin:0px"><font color="gray" size="1" style=""><a href="mailto:artin.arshamian@ki.se" target="_blank" rel="noopener noreferrer" style="margin:0px">martin.schaefer@ki.se</a></font></span></p>
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<span lang="en-US" style="margin:0px"><font color="gray" size="1" style="">______________________________________<br>
Karolinska Institutet – a Medical University</font></span></p>
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