<div dir="ltr"><div><div><div>Dear all,<br><br></div>I have the same question. Do we need to separate the two gradiometer sensors at one position when defining the neighbours for interpolating bad sensors?<br><br></div>Thanks!<br><br></div>Lin<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Sep 17, 2015 at 3:43 AM, Darinka Trübutschek <span dir="ltr"><<a href="mailto:darinkat87@gmail.com" target="_blank">darinkat87@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Dear Fieldtrip community,<div><br></div><div>I am new to MEG/fieldtrip and have a question regarding the neighbor structure necessary for computing cluster-based statistics. I am currently analyzing data from a Neuromag 306 system (with 102 Mags and 204 Grads) and would like to look separately at Mags, Grad1, and Grad2.</div><div>I assume that this means that I also need to compute the neighbors separately for the different channel types. </div><div><br></div><div>My question therefore concerns fieldtrip's standard neighbor templates for Neuromag. Is there a specific reason (theoretical or methodological), why there are no separate templates for Grad1 and 2? All that I could find are separate templates for Mag (neuromag306mag_neighb.mat), the combined planar gradients (neuromag306cmb_neighb.mat), and the neuromag306planar_neighb.mat template, which, if I understand correctly, does not combine the Grads, but still lists sensors of one type as neighbors of sensors of another type (e.g., for sensor 0713 - a gradiometer measuring the derivative along the longitudinal component, the neighbors listed include 0432, 0723, but also sensors that, if I interpret it correctly, should measure the derivative along the latitudinal component, such as 0433, 0712, etc.) Is there a specific reason, why sometimes, for a given sensor position, both Grad1 and Grad2 are included in the neighbors (e.g., 0432 and 0433), but sometimes only one of the two (e.g., 0742)?<br></div><div><br></div><div>Many thanks in advance for your help!</div><div><br></div><div>Best,</div><div>Darinka</div><span class="HOEnZb"><font color="#888888"><div>-- <br><div><div dir="ltr"><div><div dir="ltr"><font face="tahoma, sans-serif">Darinka Trübutschek (PhD Candidate)</font><div><font face="tahoma, sans-serif"><br></font><div><font face="tahoma, sans-serif">Inserm-CEA Cognitive Neuroimaging Unit</font></div></div><div><font face="tahoma, sans-serif">CEA/SAC/DSV/DRM/Neurospin</font></div><div><font face="tahoma, sans-serif">Bât 145, Point Courier 156</font></div><div><font face="tahoma, sans-serif">F-91191 Gif-sur-Yvette</font></div><div><font face="tahoma, sans-serif"><br></font></div><div><font face="tahoma, sans-serif">website: <a href="https://sites.google.com/site/dtruebutschek/" target="_blank">https://sites.google.<wbr>com/site/dtruebutschek/</a></font></div></div></div></div></div>
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