<div dir="ltr">Dear Chris,<div><br></div><div>thanks again for your comment. </div><div><br></div><div>Cheers,</div><div>Zsolt</div></div><div class="gmail_extra"><br><div class="gmail_quote">2015-05-19 12:47 GMT+02:00 Cristiano Micheli <span dir="ltr"><<a href="mailto:michelic72@gmail.com" target="_blank">michelic72@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><br><div class="gmail_extra">Dear Zsolt,<br></div><div class="gmail_extra">please find an answer below.<br></div><div class="gmail_extra">Regards<br></div><div class="gmail_extra">Cris<br><br></div><div class="gmail_extra"><div class="gmail_quote"><span class="">On Mon, May 18, 2015 at 11:33 AM, Zsolt Turi <span dir="ltr"><<a href="mailto:zsoltturi@gmail.com" target="_blank">zsoltturi@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hi Tzvetan and Chris,<div><br></div><div>thanks for your emails.</div><div>Removing channelcmb and adding a new one called label solved my problem. </div><div><br></div><div>Chris: </div><div>I'ld like to compare the WPLI difference of two conditions, congruent and incongruent ones by using a within-subjects design (so not a between trials comparison). </div><div>From your email I may infer that after running wpli, I should still have my trials. However, I do not have repetitions (trials) anymore in the output structure. Am I doing an illegitimate step during wPLI calculation or miss one specification?</div></div></blockquote></span><div><br>You did it correctly.<br>After running the wPLI metric ( I suggest the unbiased version of it, use the 'wpli_debiased' method in ft_connectivityanalysis) you are left with no trials. This is because the trials dimension (and tapers) are used to estimate the phase lag index. If I left that implied in the previous mail, I did not communicate it very well. What I meant to say is to be careful in the contrast of two conditions, because the subtraction (or ratio, or else...) will generate fake effects (or false positives) if the trials in condition 1 and condition 2 BEFORE wPLI calculation are different.<br><br></div><div>I hope this helps<br></div><div>Cris<br><br></div><div><div class="h5"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div><br></div><div><div>cfg = [];</div><div>cfg.method = 'wpli'; </div><div>dataWPLI = ft_connectivityanalysis(cfg,TFRhann);</div></div><div><br></div><div><br></div><div><span><div> labelcmb: {9x2 cell}</div><div> dimord: 'chan_freq_time'</div></span><div>wplispctrm: [9x43x16 double]</div><div> freq: [1x43 double]</div><span><div> time: [-0.5000 -0.4004 -0.3008 -0.1992 -0.0996 0 0.0996 0.1992 0.3008 0.4004 0.5000 0.5996 0.6992 0.8008 0.9004 1]</div><div> cfg: [1x1 struct]</div></span></div><div><br></div><div>Thanks for your help!</div><div><br></div><div>Best,</div><div>Zsolt</div><div><br></div><div><br><div><br></div></div></div><div><div><div class="gmail_extra"><br><div class="gmail_quote">2015-05-18 8:18 GMT+02:00 Tzvetan Popov <span dir="ltr"><<a href="mailto:tzvetan.popov@uni-konstanz.de" target="_blank">tzvetan.popov@uni-konstanz.de</a>></span>:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="word-wrap:break-word"><div>Hi Zsolt,</div><div><span><br><br><blockquote type="cite"><div dir="ltr">Hi Tzvetan,<div><br></div><div>thanks for your suggestions. </div><div>I am still stucked at the ft_freqstatistics, as I keep on receiving the following error and would be glad if you could make a comment on this as well:</div><div><br></div><div><div>####</div><div>Reference to non-existent field 'label'.</div><div><br></div><div>Error in ft_freqgrandaverage (line 123)</div><div> cfg.channel = ft_channelselection(cfg.channel, varargin{i}.label);</div></div><div>###</div><div><br></div><div>Is it because I have labelcomb in the WPLI data?</div></div></blockquote></span>yes<span><br><blockquote type="cite"><div dir="ltr"><div><br></div><div><div>labelcmb: {9x2 cell}</div><div> dimord: 'chan_freq_time'</div><div> wplispctrm: [9x7x16 double]</div><div> freq: [3 4 5 6 7 8 9]</div><div> time: [-0.5000 -0.4004 -0.3008 -0.1992 -0.0996 0 0.0996 0.1992 0.3008 0.4004 0.5000 0.5996 0.6992 0.8008 0.9004 1]</div><div> cfg: [1x1 struct]</div></div><div><br></div><div>And this is my specification (I couldn't fine the option cfg.channelcmb for ft_freqgrandaverage in the reference documentation):</div></div></blockquote></span>again try to give cell arrays as input to ft_freqanalysis. I’m still considering the case you mentioned in your initial e-mail, one channel etc.</div><div>e.g. cfg.channel = ‘FCzF3’;</div><div> cfg.parameter = ‘wplispctrm’;</div><div> cfg.neighbours = []; % this will force clustering over time and freq dimension</div><div><br></div><div>best</div><span><font color="#888888"><div>tzvetan</div></font></span><div><div><div><br></div><div><blockquote type="cite"><div dir="ltr"><div><br></div><div><div>cfg = [];</div><div>cfg.keepindividual = 'yes';</div><div>cfg.cfg.foilim = 'all';</div><div>cfg.toilim = 'all';</div><div>cfg.channel = 'all';</div><div>cfg.parameter = 'wplispctrm';</div></div><div><br></div><div>Thanks again for the answer in advance!</div><div><br></div><div>Best,</div><div>Zsolt</div><div><br></div><div>ps.I can provide other parts of my code but I don't want to make this mail too long :</div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">2015-05-13 19:14 GMT+02:00 Tzvetan Popov <span dir="ltr"><<a href="mailto:tzvetan.popov@uni-konstanz.de" target="_blank">tzvetan.popov@uni-konstanz.de</a>></span>:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="word-wrap:break-word"><div>Hi Zsolt,</div><div><span><br><br><blockquote type="cite"><div dir="ltr"><p class="MsoNormal"><span style="font-family:Arial,sans-serif" lang="EN-US">Dear all,</span></p><div><span style="font-family:Arial,sans-serif" lang="EN-US"> </span><br></div><p class="MsoNormal" style="text-align:justify"><span style="font-family:Arial,sans-serif" lang="EN-US">I would like
to perform a cluster-based permutation test on weighted phase lag index values by
using a within-subjects experimental design. I have two conditions (congruent
and incongruent one) and my goal is to compute WPLI between certain channel
combinations (FCz and F3 for instance) and see the WPLI change let’s say in 3-9
Hz and -100 to 500 ms between the two conditions. </span></p><p class="MsoNormal" style="margin-bottom:0.0001pt"><span style="font-family:Arial,sans-serif" lang="EN-US"><br></span></p><p class="MsoNormal" style="margin-bottom:0.0001pt"><span style="font-family:Arial,sans-serif" lang="EN-US">I experienced some difficulties a</span><span style="font-family:Arial,sans-serif">fter the point when I calculated the WPLI data for each participant. To perform the above-mentioned comparison, shall I use ‘</span><span style="font-family:Arial,sans-serif">ft_freqstatistics’for the cluster-based permutation test?</span></p><div><br></div></div></blockquote></span>You could. Stick with the tutorial you are currently working with. You should organize your data into cell arrays and call ft_freqstatistics like this: stat = ft_freqstatistics(cfg, congruent{:}, incongruent{:}). Furthermore you should specify cfg.parameter = ‘wplispctrm’ otherwise ft_freqstatistics will default to ‘powspctrm’ which will be not present in the data.</div><div>good luck</div><span><font color="#888888"><div>tzvetan</div><div><br></div></font></span></div><br>_______________________________________________<br>
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