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<font size="4" class="">Hi Julian,</font>
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<div class=""><font size="4" class="">Fieldtrip can only automatically define ’neighbours’ in node-space, not in edge-space. That is, providing a specification of cfg.neighbours (see ft_prepare_neighbours etc.), the lower-level function that deals with the
spatial clustering can create a boolean adjacency matrix (#nodes x #nodes). This adjacency matrix is implicitly stored in cfg.connectivity. This works only if the input data is defined on the nodes.</font></div>
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<div class=""><font size="4" class="">In your case, where the input data is defined on edges (i.e. channel combinations), it should be theoretically possible to add a cfg.connectivity adjacency matrix, which is defined on the edges. Yet, you need to define
this matrix yourself by hand (you can grep the code base for cfg.connectivity to get an idea of the relevant code). The crucial question there is that you need to define when two edges are defined as neighbours. Another thing to keep in mind is that the order
of the edges in the adjacency matrix needs to be exactly the same as the order of the edges in your data, because FieldTrip assumes this order to be the same (and it has no way of checking or correcting for a possible mismatch).</font></div>
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<div class=""><font size="4" class="">So, long story short, with some fiddling around, what you want to achieve might be possible, but it needs some creativity on your end.</font></div>
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<div class=""><font size="4" class="">Best wishes,</font></div>
<div class=""><font size="4" class="">Jan-Mathijs</font></div>
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<div class="">On 27 Aug 2021, at 15:32, Julian Amacker via fieldtrip <<a href="mailto:fieldtrip@science.ru.nl" class="">fieldtrip@science.ru.nl</a>> wrote:</div>
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<div dir="ltr" class=""><span style="font-family: Helvetica; font-size: 12px;" class="">Hi all,</span><br style="font-family: Helvetica; font-size: 12px;" class="">
<br style="font-family: Helvetica; font-size: 12px;" class="">
<span style="font-family: Helvetica; font-size: 12px;" class="">I’m investigating methods for statistical analysis of intra-subject study. The data are PTE matrices (chan x chan) for two conditions, effect and baseline.</span><br style="font-family: Helvetica; font-size: 12px;" class="">
<span style="font-family: Helvetica; font-size: 12px;" class="">Is there a function in fieldtrip to do a (spatial) cluster based permutation test on connectivity data? Or would it be possible to use the function t_freqstatistics.m but for connectivity matrices?</span><br style="font-family: Helvetica; font-size: 12px;" class="">
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<span style="font-family: Helvetica; font-size: 12px;" class="">Many thanks and best regards,</span><br style="font-family: Helvetica; font-size: 12px;" class="">
<span style="font-family: Helvetica; font-size: 12px;" class="">Julian</span><br class="">
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