[FieldTrip] Creation of MNI-aligned grids in individual gray matter?

[Christopher Day]

Hi,

I'm quite new to FieldTrip, and I've been following the tutorials and example code online to perform source reconstruction on EEG data.

I have had some success at creating MNI-aligned grids in individual head-space following this example:

http://fieldtrip.fcdonders.nl/example/create_single-subject_grids_in_individual_head_space_that_are_all_aligned_in_mni_space

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?

This is the plotting code copied from the example page:

figure;
ft_plot_vol(vol, 'edgecolor', 'none'); alpha 0.4;
ft_plot_mesh(grid.pos(grid.inside,:));

I have also been trying to restrict my source analysis to gray matter using this FAQ: http://fieldtrip.fcdonders.nl/faq/can_i_restrict_the_source_reconstruction_to_the_grey_matter

And this old conversation on the mailing list:

http://mailman.science.ru.nl/pipermail/fieldtrip/2012-March/004984.html

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?

Any help gratefully received.

Kind regards,

Chris Day

PhD Student in Psychological Sciences,
University of Manchester,
Zochonis Building, 3rd Floor, T4.

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