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When you call ft_freqanalysis with ‘fourier’ in the cfg.method, followed by ft_sourceanalysis with ‘pcc’ in cfg.method, the source.avg.mom contains the fourier coefficients at the single taper level. A bunch of tapers constitute a single trial, the number of
which depends on the smoothing parameter that you used in ft_freqanalysis.
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<div class="">Jan-Mathijs</div>
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<div class="">On 2 Feb 2018, at 01:12, Yaocong Duan <<a href="mailto:yaocong.duan@gmail.com" class="">yaocong.duan@gmail.com</a>> wrote:</div>
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<div dir="ltr" class="">Hi Stephen,
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<div class="">Thank you for your response. I write something wrong in my previous email. the freq structure does have trails information. but then I do a source reconstruction and generate a source structure. phase locking value is calculated from the source structure
directly. However, the source structure does not have any trails info (trails seems have been averaged).</div>
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<div class="">source = ft_sourceanalysis(cfg, freq);</div>
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<div class="">plv = ft_connectivityanalysis(cfg, souceSparse);</div>
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<div class="">below are the freq structure generated by freq analysis, source structure generated by source analysis as well as the .avg field of source structure.</div>
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<div class="gmail_quote">On 1 February 2018 at 18:02, Stephen Whitmarsh <span dir="ltr" class="">
<<a href="mailto:stephen.whitmarsh@gmail.com" target="_blank" class="">stephen.whitmarsh@gmail.com</a>></span> wrote:<br class="">
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<div dir="ltr" class="">Dear <span style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:12.8px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline" class="">Yaocong,</span>
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<div class=""><span style="font-size:12.8px" class="">To understand your question, it would be helpful if you post the output of the freqanalysis, i.e. your
<i class="">freq </i>datastructure. It should contain a .<i class="">pow </i>field, which should be an array of structs, numbering your number of trials, right?</span></div>
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<div class=""><span style="font-size:12.8px" class="">Cheers,</span></div>
<div class=""><span style="font-size:12.8px" class="">Stephen</span></div>
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<div class="h5">On 1 February 2018 at 18:31, Yaocong Duan <span dir="ltr" class="">
<<a href="mailto:yaocong.duan@gmail.com" target="_blank" class="">yaocong.duan@gmail.com</a>></span> wrote:<br class="">
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<span style="font-size:11pt" class="">Hi All,<span class=""></span></span></div>
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<span style="font-size:11pt" class="">I am using Phase Locking Value to measure the connectivity between brain regions at the source level. I learned that the PLV is an average value over trails. In the fieldtrip code, I calculated a frequency model first,
then do connectivity analysis with this freq model. The problem is I don’t see trails information in the freq model. So how do I get that phase locking result?<span class=""></span></span></div>
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<span style="font-size:11pt" class="">Below is my code. This code works, but I am confused about the question above.</span></div>
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<div class="">Thanks in advance,</div>
<div class="">Yaocong</div>
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