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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’m quite new to FieldTrip, and I’ve been following the tutorials and example code online to perform source reconstruction on EEG data.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have had some success at creating MNI-aligned grids in individual head-space following this example:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><a href="http://fieldtrip.fcdonders.nl/example/create_single-subject_grids_in_individual_head_space_that_are_all_aligned_in_mni_space">http://fieldtrip.fcdonders.nl/example/create_single-subject_grids_in_individual_head_space_that_are_all_aligned_in_mni_space</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">This is probably a stupid question, but why are some of the sources in the grid outside of the brain volume boundary in Figure 3 when the figure was plotted with the grid.inside positions?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">This is the plotting code copied from the example page:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">figure;<o:p></o:p></p>
<p class="MsoNormal">ft_plot_vol(vol, 'edgecolor', 'none'); alpha 0.4;<o:p></o:p></p>
<p class="MsoNormal">ft_plot_mesh(grid.pos(grid.<b>inside</b>,:));<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have also been trying to restrict my source analysis to gray matter using this FAQ:
<a href="http://fieldtrip.fcdonders.nl/faq/can_i_restrict_the_source_reconstruction_to_the_grey_matter">
http://fieldtrip.fcdonders.nl/faq/can_i_restrict_the_source_reconstruction_to_the_grey_matter</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">And this old conversation on the mailing list:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><a href="http://mailman.science.ru.nl/pipermail/fieldtrip/2012-March/004984.html">http://mailman.science.ru.nl/pipermail/fieldtrip/2012-March/004984.html</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I was wondering whether it is possible to combine these two avenues I’ve been pursuing and restrict the source analysis to MNI-aligned grids in individual gray matter? If so, how do you do it? And if not, can you explain why not please?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Any help gratefully received.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Kind regards,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">Chris Day<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">PhD Student in Psychological Sciences,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">University of Manchester,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">Zochonis Building, 3rd Floor, T4.<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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