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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Hi all,
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<div>I am having problems using ft_sourceanalysis with planar gradiometer data.</div>
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</div>
<div>I am following a tutorial for beamforming with lcmv method (which I believe is a work in progress) found here:</div>
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<p class="MsoNormal" style="text-align:justify;text-justify:inter-ideograph;
mso-pagination:none;mso-layout-grid-align:none;text-autospace:none">
<a href="http://fieldtrip.fcdonders.nl/tutorial/beamformer_lcmv?s[]=covariancewindow" target="_blank">http://fieldtrip.fcdonders.nl/tutorial/beamformer_lcmv?s[]=covariancewindow</a></p>
<p class="MsoNormal" style="text-align:justify;text-justify:inter-ideograph;
mso-pagination:none;mso-layout-grid-align:none;text-autospace:none">
Using planar gradiometer data is mentioned in the tutorial, although not in detail.</p>
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mso-pagination:none;mso-layout-grid-align:none;text-autospace:none">
<br>
</p>
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My problem:</p>
<p class="MsoNormal" style="text-align:justify;text-justify:inter-ideograph;
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<font style="font-size: 10pt;">The .avg field produced by time locking, is lost when combining planar gradiometers using '</font><span style="font-size: 10pt;">ft_combineplanar'.</span></p>
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<span style="font-size: 10pt;">In this case, I am unable to to use 'ft_sourceanalysis' on combined planar gradiometer data.</span></p>
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<span style="font-size: 10pt;">I get the error: </span><span style="font-size: 10pt;"><font color="#ff0000">Reference to non-existent field 'avg'.</font></span></p>
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<span style="font-size: 10pt;"><font color="#ff0000"><br>
</font></span></p>
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<span style="font-size: 10pt;">I reasoned that I may be able to keep the .avg filed if I combine the planar gradiometer data at the outset, prior to timelocking. But in this case, the gradiometer positions in data.grad does not include 'coilpos'. Eg, no data.grad.coilpos.</span></p>
<p class="MsoNormal" style="text-align:justify;text-justify:inter-ideograph;
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When<font size="2"> calling 'ft_sourceanalysis' in this case, I get the error: </font><span style="font-size: 10pt;"><font color="#ff0000">Reference to non-existent field 'coilpos'.</font></span><span style="font-size: 10pt;"> </span></p>
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<span style="font-size: 10pt;"><br>
</span></p>
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<span style="font-size: 10pt;">Any suggestions?</span></p>
<p class="MsoNormal" style="text-align:justify;text-justify:inter-ideograph;
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<span style="font-size: 10pt;"><br>
</span></p>
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<span style="font-size: 10pt;">If the .grad.coilpos was retained when I combined the planar gradiometer data at the outset, (after preprocessesing and prior to timelokcing) then I would be able to use ft_sourceanalysis on planar gradiometer combined data </span>successfully.</p>
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Is that possible?</p>
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<br>
</p>
<p class="MsoNormal" style="text-align:justify;text-justify:inter-ideograph;
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Thanks in advance! (and thank you to all previous very helpful responses on this list).</p>
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<br>
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Kaelasha Tyler </p>
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PhD Candidate </p>
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Brain and Psychological Science Research Centre</p>
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Swinburne University of Technology</p>
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Melbourne</p>
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Australia</p>
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