<div dir="ltr"><div><div><div><div>Hi Mona,<br><br></div>I'm not sure I understand your question but ill give it a go:<br><br>In Elekta, labels of magnetometers end in 1, (e.g. MEG10<b>1</b>), gradiometers in (e.g. MEG22)2 and 3. The latter are the orthogonal 8-shaped coils that are often combined, e.g. using ft_combineplanar. This will reduce the 204 gradiometers in 102 combined gradiometer, that FT assigns labels to, showing you which sensors are combined, e.g. "MEG102+MEG103".<br><br></div>If you use ft_selectdata, or a cfg.channel configuration field, you can use * as I mentioned before, or ? and other wildcards such as MEG, and MAG, to select sensortypes.<br><br></div>Hope this helps,<br></div>Stephen<br></div><div class="gmail_extra"><br><div class="gmail_quote">On 19 October 2016 at 18:42, Wong-Barnum, Mona <span dir="ltr"><<a href="mailto:mona@sdsc.edu" target="_blank">mona@sdsc.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<span class="m_-8512670473772823535Apple-tab-span" style="white-space:pre-wrap"></span>Thanks Stephen, your code was very helpful (:
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<div><span class="m_-8512670473772823535Apple-tab-span" style="white-space:pre-wrap"></span>My data has 2 gradiometers but it appears that there is only a single megplanar channel type. Is there a way to further separate the 2 gradiometers?</div>
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<div>Mona</div>
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<div>On Oct 18, 2016, at 10:22 PM, Stephen Whitmarsh <<a href="mailto:stephen.whitmarsh@gmail.com" target="_blank">stephen.whitmarsh@gmail.com</a>> wrote:</div>
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<div>Hi Mona,<br>
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To add to Tzvetan:<br>
<br>
- You can in many FieldTrip functions specify on which channels you want to work (cfg.channel), e.g. in ft_preprocessing.<br>
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- You can also split the data later using ft_selectdata, e.g.:<br>
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cfg = []<br>
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cfg.channel = 'MEG';<br>
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data_MEG = ft_selectdata(cfg,data_<wbr>combined);<br>
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cfg = []<br>
cfg.channel = 'EEG';<br>
data_EEG = ft_selectdata(cfg,data_<wbr>combined);<br>
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- To selecting magnetometers or gradiometers you can use: <br>
cfg.channel = 'MEG*1'<br>
cfg.channel = {'MEG*2', 'MEG*3'}<br>
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Cheers,<br>
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Stephen<br>
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<div class="gmail_extra"><br>
<div class="gmail_quote">On 19 October 2016 at 01:17, Wong-Barnum, Mona <span dir="ltr">
<<a href="mailto:mona@sdsc.edu" target="_blank">mona@sdsc.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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I have Elekta Neuromag .fif files which contains MEG and EEG data. What steps do I need to do to separate the MEG from EEG and the 3 different MEG sensor data (magnetometer, 2 gradiometer)?<br>
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I have been looking through the FieldTrip documentation but haven’t found what I need. All help is appreciated.<br>
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thanks,<br>
Mona<br>
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