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Hi all,
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<div class="">Stephen is totally right. If you’re in for doing a MEG source reconstruction there is no need to interpolate missing channels. The interpolation step does not add new information (it just represents old information in a different way). Also, the
introduction of rank deficiency might introduce numerical problems if you don’t deal with that properly.</div>
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<div class="">Best wishes,</div>
<div class="">Jan-Mathijs</div>
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<div class="">PS: thanks Stephen for teaching me a new verb: to intuit :).<br class="">
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<div class="">On 4 Oct 2021, at 19:22, Stephen Whitmarsh via fieldtrip <<a href="mailto:fieldtrip@science.ru.nl" class="">fieldtrip@science.ru.nl</a>> wrote:</div>
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Hi Fan,
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<div class="">While Julian is of course right, and ft_channelrepair will probably do it for you, I don't think you <i class="">have<span class="Apple-converted-space"> </span></i>to interpolate before doing source modelling: just don't include those channels
in your source modelling.</div>
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<div class="">Someone more fluent in the underlying math can chime in, and don't take it from me, but I would intuit that interpolating channels will make your data rank-deficient. I doubt this would pose any real problems though.</div>
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<div class="">Cheers,</div>
<div class="">Stephen</div>
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<div dir="ltr" class="gmail_attr">Op ma 4 okt. 2021 om 19:04 schreef Julian Keil via fieldtrip <<a href="mailto:fieldtrip@science.ru.nl" class="">fieldtrip@science.ru.nl</a>>:<br class="">
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<div style="overflow-wrap: break-word;" class="">Hi Fan,
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<div class="">ft_channelrepair is what you’re looking for: <a href="https://urldefense.com/v3/__https://www.fieldtriptoolbox.org/reference/ft_channelrepair/__;!!HJOPV4FYYWzcc1jazlU!o8oPUVhu488868p0k77GXZEoEu0U1SoRKtrHgdhGfunViqT_gPMhSGQjba5q1qqDVFZc8W9QUeJYzpA$" target="_blank" class="">https://www.fieldtriptoolbox.org/reference/ft_channelrepair/</a></div>
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<div class="">Best,</div>
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<div class="">Julian</div>
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<div class="">Am 04.10.2021 um 18:07 schrieb go puluto via fieldtrip <<a href="mailto:fieldtrip@science.ru.nl" target="_blank" class="">fieldtrip@science.ru.nl</a>>:</div>
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Hi there,</div>
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Does anyone know how to interpolate positions of grad (that were missing at the recording session) for source reconstruction? There are 6 sensors that were not recorded during MEG data collection, is there a function in Fieldtrip to re-interpolate these grad
positions? Thanks so much in advance. </div>
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best,</div>
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Fan</div>
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