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Dear Davide,<br>
<br>
I was hesitant to answer, because I thought others know more than
me. But since none responded, I can try to help with my limited
knowledge.<br>
<br>
From my knowledge of source reconstruction, I can just say that if
all your source reconstructions are in the same space (say, MNI),
you can use the .pos from your template to overcome this problem. I
am not using ft_volumenormalise, so I have no experience what is
exactly going on there. I would assume, however, that
volumenormalise will transofmr your source structures to a common
space.<br>
However, I stick to normalizing the following way:<br>
<a class="moz-txt-link-freetext" href="http://fieldtrip.fcdonders.nl/example/create_single-subject_grids_in_individual_head_space_that_are_all_aligned_in_mni_space">http://fieldtrip.fcdonders.nl/example/create_single-subject_grids_in_individual_head_space_that_are_all_aligned_in_mni_space</a><br>
<br>
Hope it helps at least a little bit.<br>
Best,<br>
Jörn<br>
<br>
On 10/19/2011 6:12 PM, Davide Rivolta wrote:
<blockquote
cite="mid:CAMkcSw5LPnYAeibG1qhnbAeqFLHdbMv7BCbmDgqz6C0dY-T_wg@mail.gmail.com"
type="cite">
<div>Hi Michael,</div>
<div> </div>
<div>I am using the single shell (Nolte).</div>
<div> </div>
<div>The grid has 2340 positions, but I am not still using mni.</div>
<div> </div>
<div>Thanks,</div>
<div> </div>
<div>Davide<br>
<br>
</div>
<div class="gmail_quote">On Wed, Oct 19, 2011 at 5:44 PM, Michael
Wibral <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:michael.wibral@web.de">michael.wibral@web.de</a>></span>
wrote:<br>
<blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px
0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">
<div style="BACKGROUND-COLOR: #ffffff; FONT-FAMILY: Verdana,
Arial, sans-serif; FONT-SIZE: 10pt" bgcolor="#FFFFFF">Hi
davide,<br>
<br>
what headmodel and grid are you using?<br>
<br>
Michael<br>
<br>
<br>
<blockquote style="BORDER-LEFT: blue 2px solid;
PADDING-LEFT: 5px; MARGIN-LEFT: 5px; PADDING-TOP: 5px">
<hr>
<b>Von:</b> "Davide Rivolta" <<a moz-do-not-send="true"
href="mailto:drivolta81@gmail.com" target="_blank">drivolta81@gmail.com</a>><br>
<b>Gesendet:</b> Oct 19, 2011 3:54:37 PM<br>
<b>An:</b> "Email discussion list for the FieldTrip
project" <<a moz-do-not-send="true"
href="mailto:fieldtrip@donders.ru.nl" target="_blank">fieldtrip@donders.ru.nl</a>><br>
<b>Betreff:</b> [FieldTrip] beamforming - normilise issue
<div>
<div class="h5"><br>
<br>
<div>Dear all,</div>
<div> </div>
<div>I am trying to use beamforming for some MEG data.</div>
<div> </div>
<div>I have 1 condition, and I wish to compare it
against the baseline. Ideally I wish to have the
average of all group and statistically compare
stimulus agains baseline..</div>
<div> </div>
<div>As such, for each subject I calculate the source
for the baseline and the source for the stimulus
(using a common filter as indicated on the website).</div>
<div> </div>
<div>I then call ft_sourceinterpolate and, since I
wish to have a group analysis, ft_volumenormalise.</div>
<div>In order to compute the average, I call
ft_sourcegrandaverage.</div>
<div> </div>
<div>Even though the help tells me that it is fine,
the grandaverage does not work if the input is from
the ft_volumenormalise. It is because there is not
the ".pos" field!</div>
<div> </div>
<div>Am I doing something wrong?</div>
<div> </div>
<div>Any advice would be great.</div>
<div> </div>
<div>Thanks a lot,</div>
<div> </div>
<div>Davide</div>
</div>
</div>
</blockquote>
</div>
<br>
_______________________________________________<br>
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href="http://mailman.science.ru.nl/mailman/listinfo/fieldtrip"
target="_blank">http://mailman.science.ru.nl/mailman/listinfo/fieldtrip</a><br>
</blockquote>
</div>
<br>
<br clear="all">
<br>
-- <br>
Davide Rivolta, PhD<br>
<br>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
fieldtrip mailing list
<a class="moz-txt-link-abbreviated" href="mailto:fieldtrip@donders.ru.nl">fieldtrip@donders.ru.nl</a>
<a class="moz-txt-link-freetext" href="http://mailman.science.ru.nl/mailman/listinfo/fieldtrip">http://mailman.science.ru.nl/mailman/listinfo/fieldtrip</a></pre>
</blockquote>
<br>
<br>
<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 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 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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