<div dir="ltr"><div><span style="font-size:12.8px">Thanks Alex!</span><div style="font-size:12.8px"><br></div><div style="font-size:12.8px">I am wondering why when I plot the psd on the brain I get a lot of activity in the corpus callosum and white matter rather than in the grey matter, which is where the sources are localized to. Here is a link to example screenshots of the source distribution vs the psd distribution on the brain, which don't seem to match: <span style="font-size:small"><a href="https://www.dropbox.com/sh/blstn3xitewbg5t/AACia--q9mF6d0ZjluhXq_TGa?dl=0">https://www.dropbox.com/sh/blstn3xitewbg5t/AACia--q9mF6d0ZjluhXq_TGa?dl=0</a></span></div><div style="font-size:12.8px"><span style="font-size:12.8px"><br></span></div><div style="font-size:12.8px"><span style="font-size:12.8px"> How can I check that the source psd is being plotted correctly?</span></div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px">Thanks and Best,</div><div style="font-size:12.8px">Gladia</div></div><div style="font-size:12.8px"><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Jul 5, 2016 at 4:54 PM, Alexandre Gramfort <span dir="ltr"><<a href="mailto:alexandre.gramfort@telecom-paristech.fr" target="_blank">alexandre.gramfort@telecom-paristech.fr</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">> Could anyone explain why MNE should be used instead of dSPM to get the power<br>
> plots? The tutorial on the MNE website says to use dSPM as the solver.<br>
<br>
</span>dSPM is just a normalized/scaled version of MNE (scaling is obtained<br>
form the noise standard deviation derived from the noise cov). So<br>
basically it's just a scaling factor. If you apply a baseline /<br>
contrast with a log ratio of power then there is no diff between the<br>
2.<br>
<br>
HTH<br>
Alex<br>
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