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<p class="MsoNormal">Hello Fieldtrip,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">This is my first posting so I’ll introduce myself. My name is Martin and I’m a PhD student at the Institute of Hearing Research in Nottingham, primarily interested in auditory oscillations associated with tinnitus using EEG and MEG. This
problem is from a project I did a while back but I’m just wrapping up now. <o:p>
</o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’m having a problem with running some cluster based permutation statistics on some frequency and timelocked MEG data I have. The first thing to mention is that the code runs fine. Fieldtrip is happy to run the tests, the problem is that
I am getting no significant clusters out of it. This is in spite of some rather large t-values that might suggest otherwise. I suspect this is due to the fact that the frequency and timelocked data I am passing to the relevant stats functions (ft_freqstatistics
and ft_timelockstatistics respectively) is analysed in source space, not sensor space. Unfortunately, due to data artefacts it isn’t possible for me to do these analyses in sensor space. As such, I think that fieldtrip is telling me I have no clusters because
it defines clusters based on neighbouring channels/sensors supplied by a layout template which it no longer has access too because I’m in source space on an MNI grid system.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have 2 questions then:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Is this a sensible conclusion for why I’m getting no significant clusters?
<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>And if so, is there a way I can make the fieldtrip statistics functions recognise MNI grids and calculate the neighbours on grid points rather than sensors?
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Many thanks,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Martin<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">==============================================================<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">Martin Holding<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">PhD Student<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">MRC Institute of Hearing Research<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">University Park<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">Nottingham<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">NG7 2RD<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">Tel: (0115 74) 86938
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">Email: <a href="mailto:martin.holding@nottingham.ac.uk">
martin.holding@nottingham.ac.uk</a><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">==============================================================<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">Martin Holding<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">PhD Student<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">MRC Institute of Hearing Research<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">University Park<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">Nottingham<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">NG7 2RD<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">Tel: (0115 74) 86938
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">Email: martin.holding@nottingham.ac.uk<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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