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Dear Jörn,<br>
Thanks for you reply. I did mean source-level, so like you said, I
am trying to define the neighbouring voxels for each voxel.<br>
As far as I understand, leaving cfg.neighbours blank means that the
clustering is done over the time and frequency dimensions only, not
over space. <br>
The FT help reads: <br>
%If you specify an empty neighbourhood structure, clustering will
only be done in frequency and time (if available) and not over
neighbouring channels.<br>
<br>
Has anybody done clustering in source space using all three
dimensions and could explain how this works?<br>
Cheers, <br>
Ulrich<br>
<br>
<br>
<br>
<br>
On 30.01.2012 16:37, "Jörn M. Horschig" wrote:
<blockquote cite="mid:4F26B91E.2050200@donders.ru.nl" type="cite">
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Dear Ulrich,<br>
<br>
I think you are confusing some things there. cfg.neighbourdist is
a setting for defining neighbouring <i>sensors</i>, thus it's not
applicable for source level statistics (see
ft_prepare_neighbours). However, I never did cluster-based
permutation test on source-level in FieldTrip, but for me it seems
that it just works by taking neighbouring voxels as neighbours.
So, you shouldn't need to define anything special for running
sourcelevel stats (if I am wrong, someone with more experience
should correct me here). <br>
But, maybe you meant to write sensor level, but wrote source level
- in that case I'd be happy to help.<br>
<br>
Best,<br>
Jörn<br>
<br>
On 1/27/2012 4:34 PM, Pomper, Ulrich wrote:
<blockquote cite="mid:4F22C422.4080906@charite.de" type="cite">
Dear list members,<br>
I am trying to perform a cluster based permutation test on power
values at source level.<br>
I managed to run the test using just the time and frequency
dimensions (cfg.neighbourdist = [])<br>
but I am struggling with the issue of how to define the
neighbourdist parameter.<br>
I've looked through the tutorial, the FT site as well as through
the mailinglist but couldn't find an answer, so I'd really
appreciate any hint on this.
<p style="margin-bottom: 0in">Thanks a lot, <br>
Ulrich </p>
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<pre class="moz-signature" cols="72">--
Jörn M. Horschig
PhD Student
Donders Institute for Brain, Cognition and Behaviour
Centre for Cognitive Neuroimaging
Radboud University Nijmegen
Neuronal Oscillations Group
P.O. Box 9101
NL-6500 HB Nijmegen
The Netherlands
Contact:
E-Mail: <a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:jm.horschig@donders.ru.nl">jm.horschig@donders.ru.nl</a>
Tel: +31-(0)24-36-68493
Web: <a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://www.ru.nl/donders">http://www.ru.nl/donders</a>
Visiting address:
Trigon, room 2.30
Kapittelweg 29
NL-6525 EN Nijmegen
The Netherlands</pre>
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