<html><head><meta http-equiv="Content-Type" content="text/html charset=iso-8859-1"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>Hi all,</div><div><br></div><div>I have also been trying to reinterpolate MEG channels that were never recorded with the nearest neighbour interpolation method, however when calling the method (in the same way Tom also used it) the function seems to do something, however it did not interpolate the missing sensors. </div><div>There were still 273 sensors instead of 275. Do I need to give along a special cfg.grad or do something else?</div><div><br></div><div>Thanks in advance,</div><div><br></div><div>Linsey</div><div><br></div><br><div><div>On Nov 26, 2012, at 10:45 AM, Jörn M. Horschig <<a href="mailto:jm.horschig@donders.ru.nl">jm.horschig@donders.ru.nl</a>> wrote:q</div><br class="Apple-interchange-newline"><blockquote type="cite">
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<div class="moz-cite-prefix">Hey Tom,<br>
<br>
</div>
<blockquote cite="mid:50B23369.5020105@fcdonders.ru.nl" type="cite">
<br>
I guess I have several questions all at once:<br>
1) Is it actually possible to reinterpolate MEG channels that were
never recorded - eg because the channels were deactivated when the
acquisition took place? <br>
</blockquote>
<br>
Should work, but only with the SSI (=spherical spline interpolation)
method. For the nearest neighbour interpolation, the function
constructs a list of neuighbouring and constructs a weighted
average. The function, however, wants to weigh each sensor according
to its distance from the sensor to be reconstructed. That
information can only be found in the grad structure, but in the grad
structure there are only sensors which were recorded, thus the
distance from a missing sensor cannot be measured because its
position is missing in the grad structure. SSI should work though,
cause it relies on a different rationale.<br>
<br>
<br>
<blockquote cite="mid:50B23369.5020105@fcdonders.ru.nl" type="cite">
2) What might be causing the error I'm seeing?<br>
</blockquote>
<br>
Since you have 301 channels rather than 275, my suspicion is that
you include reference gradiometers. This should not fail in
principle, though... maybe I can drop by your office to check it
out? Got some time right now?<br>
<br>
<blockquote cite="mid:50B23369.5020105@fcdonders.ru.nl" type="cite">
3) Where is ft_fetch_sens?<br>
</blockquote>
<br>
It's a private function, can be found in FieldTrip/private. You have
to cd to that directory in order for Matlab to find it (the idea
behind private function is that there are only visible for
higher-level function and 'hidden' for all other functions).<br>
<br>
Best,<br>
Jörn<br>
<br>
<br>
<blockquote cite="mid:50B23369.5020105@fcdonders.ru.nl" type="cite">
<br>
Thanks for help with any of the above!<br>
Best,<br>
Tom<br>
<pre class="moz-signature" cols="72">--
Tom Marshall, MSc.
Neuronal Oscillations Group, Donders Centre for Cognitive Neuroimaging
tel: +31(0)243668487
email: <a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:t.marshall@fcdonders.ru.nl">t.marshall@fcdonders.ru.nl</a>
postal: PO Box 9101, 6500HB, Nijmegen, The Netherlands
visiting: Kapittelweg 29, 6525EN, Nijmegen, The Netherlands</pre>
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</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
FieldTrip Development Team
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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_______________________________________________<br>fieldtrip mailing list<br><a href="mailto:fieldtrip@donders.ru.nl">fieldtrip@donders.ru.nl</a><br>http://mailman.science.ru.nl/mailman/listinfo/fieldtrip</blockquote></div><br><div apple-content-edited="true">
<span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">--</div><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><br></div><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Linsey Roijendijk MSc.</div><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Donders Institute for Brain, Cognition and Behaviour<br>Centre for Neuroscience<br>dept. of Biophysics<br>Radboud University Nijmegen<br>Montessorilaan 3, Room B.02.34<br>P.O.Box 9104<br>6500 HE Nijmegen<br>The Netherlands<br>Tel: +31(0)24 3612616<br><a href="mailto:L.Roijendijk@donders.ru.nl">L.Roijendijk@donders.ru.nl</a></div></span></div></span></div></span></div></span></div></span></span>
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