[Mne_analysis] mne-python lcmv

[Alexandre Gramfort]

hi Jon,

let me know if this :

https://github.com/mne-tools/mne-python/commit/da303d3e1bbe013fd76819b26586949315bcf1c0

fixes the problem

Thanks for the bug report.

Alex

On Mon, Mar 11, 2013 at 4:39 PM, Martin Luessi
<mluessi at nmr.mgh.harvard.edu> wrote:
> Hi Jon,
>
> I can see distinct boundaries as well, so they do not seem to be caused by
> your setup. I'm not sure what is causing this and we have to investigate why
> the boundaries occur. The beamformer does correctly localize the activity,
> have a look at the screenshot below (frame 61 in the nifit file,
> corresponding to 100ms).
>
> As noted in the documentation, our LCMV code has not been heavily tested, so
> the boundaries might indeed be caused by an error in the code.
>
> Note that the dSPM volume inverse (link below) does not show these
> boundaries and also correctly localizes the bilateral activity. If it is an
> option for you, you could use this method instead of LCMV.
>
> Best,
>
> Martin
>
>
> http://martinos.org/mne/auto_examples/inverse/plot_compute_mne_inverse_volume.html#example-inverse-plot-compute-mne-inverse-volume-py
>
>
>
>
> On 03/10/13 19:39, Jon Houck wrote:
>>
>> Hi all,
>>
>> I'm consistently seeing distinct boundaries within my lcmv estimates,
>> and am wondering what might be wrong with my setup.  The images below
>> are axial and coronal slices from the nifti file produced by the lcmv
>> example with the sample data
>>
>> (http://martinos.org/mne/auto_examples/inverse/plot_lcmv_beamformer_volume.html).
>>    These boundaries are consistent throughout the timecourse (on
>> Dropbox, see link below).
>>
>> I've re-run the volume data tutorial and the lcmv inverse example, but
>> still see this effect. The slice and timecourse figures that I get from
>> the example script look identical to the output on the website, so it
>> may be something specific to the final step.  I'm using 0.6 of
>> mne-python (downloaded this week) with EPD, and a recent nightly build
>> of MNE.  Any ideas on what might be happening?
>>
>> Inline image 3Inline image 4
>>
>> https://www.dropbox.com/s/nkvw9mn4hio5yp7/lcmv_inverse.nii.gz
>>
>> Thanks,
>>
>> Jon
>>
>>
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>>
>
>
> --
> Martin Luessi, Ph.D.
>
> Research Fellow
>
> Department of Radiology
> Athinoula A. Martinos Center for Biomedical Imaging
> Massachusetts General Hospital
> Harvard Medical School
> 149 13th Street
> Charlestown, MA 02129
>
> Fax: +1 617 726-7422
>
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