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<p class="MsoNormal" style="text-align:justify"><span style="mso-fareast-language:EN-US">Hi
</span>Jan-Mathijs and Raghavan,<o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify"><o:p> </o:p></p>
<p class="MsoNormal" style="text-align:justify">Thank you for your emails and for sharing the paper. I’ve been doing further research into this and have come across some other useful papers that may interest you.
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<p class="MsoNormal" style="text-align:justify">The paper by Zalesky et al. describes a spatial pairwise clustering algorithm that provides a useful explanation of how you can analyse matrices with chan x chan x … dimensions using a cluster-based permutation
method, similar to the network-based statistic. The paper by Hipp et al. also provides another example of this type of approach. There is no open-source code or toolboxes for spatial pairwise clustering that I know of, but there is code for the network-based
statistic (via the brain connectivity toolbox) that may provide a starting point for developing your own code; I hope this is helpful for your own work.
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<p class="MsoNormal" style="text-align:justify"><o:p> </o:p></p>
<p class="MsoNormal" style="text-align:justify">Papers:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#222222;background:white">Zalesky, A., Cocchi, L., Fornito, A., Murray, M. M., & Bullmore, E. D. (2012). Connectivity differences in brain networks. <i>Neuroimage</i>, <i>60</i>(2),
1055-1062.</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hipp, J. F., Engel, A. K., & Siegel, M. (2011). Oscillatory synchronization in large-scale cortical networks predicts perception. Neuron, 69(2), 387-396.<o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify"><o:p> </o:p></p>
<p class="MsoNormal" style="text-align:justify">All the best,<o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify">Jack<o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Raghavan Gopalakrishnan <gopalar.ccf@gmail.com>
<br>
<b>Sent:</b> Friday, 19 March 2021 11:45 PM<br>
<b>To:</b> FieldTrip discussion list <fieldtrip@science.ru.nl><br>
<b>Cc:</b> Jack Fogarty <jf752@uowmail.edu.au><br>
<b>Subject:</b> Re: [FieldTrip] Question regarding nonparametric testing for coherence differences<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D">Hi Jack,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D">I am also trying something along the same lines.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D">I think this paper might be of help to you. I tried contacting the authors but could not get a working code.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D">Phillips JM, Vinck M, Everling S, Womelsdorf T. A long-range fronto-parietal 5- to 10-Hz network predicts "top-down" controlled guidance in a task-switch
paradigm. Cereb Cortex. 2014;24(8):1996-2008. doi:10.1093/cercor/bht050</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D">Thanks,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D">Raghavan</span><o:p></o:p></p>
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<p class="MsoNormal">On Fri, Mar 19, 2021 at 3:27 AM Schoffelen, J.M. (Jan Mathijs) <<a href="mailto:jan.schoffelen@donders.ru.nl">jan.schoffelen@donders.ru.nl</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">Hi Jack, <o:p></o:p></p>
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<p class="MsoNormal">No, currently it is not possible to cluster data of dimensionality chan_chan_<something else>_<etc>. In older versions of the low-level code (findcluster) there were some lines of code (experimental) which have never been ‘active’ as such
- i.e. they were not reachable when these functions were called from the higher level code. In the old days, if I remember well, Eric played around with channel-like clustering along more than one dimension, but the active development of this functionality
was abandoned because it was hard to get it right. I have just finished a revision of the clustering code which will be released soon, where I actually haver removed those non-functional lines. <o:p></o:p></p>
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<p class="MsoNormal">Best wishes,<o:p></o:p></p>
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<p class="MsoNormal">Jan-Mathijs<o:p></o:p></p>
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<p class="MsoNormal">On 19 Mar 2021, at 00:33, Jack Fogarty <<a href="mailto:jf752@uowmail.edu.au" target="_blank">jf752@uowmail.edu.au</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">Dear Prof Maris and Fieldtrip team,<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">Is there an established approach to clustering across channel x channel x frequency, as mentioned in this thread? I am hoping to try an exploratory between groups analysis of WPLI differences and it is unclear if the current fieldtrip functions
behave when dealing with that complexity.<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">The ‘findcluster’ function seems well set up for matrices of chan x freq x time, but it is difficult to determine if it can handle chan x chan x freq appropriately, or if a new function is required altogether.<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">Any insight would be helpful thank you!<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">Jack Fogarty<o:p></o:p></p>
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<p class="MsoNormal">PhD Student<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">T: +61 4221 5547 | E: <a href="mailto:jf752@uowmail.edu.au" target="_blank">jf752@uowmail.edu.au</a><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">Brain & Behaviour Research Institute<o:p></o:p></p>
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<p class="MsoNormal">Psychophysiology Lab | School of Psychology | University of Wollongong<o:p></o:p></p>
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<p class="MsoNormal"><image001.png><image002.png><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif">_______________________________________________<br>
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<p class="MsoNormal">_______________________________________________<br>
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<p class="MsoNormal">-- <o:p></o:p></p>
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<p class="MsoNormal"><i>Raghavan Gopalakrishnan,</i><o:p></o:p></p>
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<p class="MsoNormal"><i>Principal Research Engineer, </i><o:p></o:p></p>
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<p class="MsoNormal"><i>Cleveland Clinic</i><o:p></o:p></p>
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