[Mne_analysis] question regarding mne_do_forward_solution

[Matti Hamalainen]

Hi Andy,

On Jan 30, 2013, at 1:23 PM, Dykstra, Andrew wrote:

> Thanks all for the replies.
> 
> So, unless some change in the coordinate transforms has occurred between 
> the raw and evoked files, there should be no difference when using 
> either for computing the forward solution, correct?

This is correct. I have tried to find the rationale for the sentence in the Manual. I think I had the idea that the automatically created forward solution file name (see --fwd option) would better reflect the associated data if the convention is followed. However, I might do it differently now.

- Matti

> 
> Cheers,
> Andy
> 
> -- 
> Andrew R. Dykstra, PhD
> Auditory Cognition Lab
> Neurologie und Poliklinik
> Universitätsklinikum Heidelberg
> Im Neuenheimer Feld 400
> 69120 Heidelberg
> 
> "How small the cosmos.  How paltry and puny compared to human consciousness . . . to a single individual recollection." - Vladimir Nabokov
> 
> On 01/29/2013 09:16 AM, Alexandre Gramfort wrote:
>> hi,
>> 
>> unless something happened to the raw file since the evoked
>> was computed the measurement information (channel
>> location, head transformation etc.) should be identical between the raw
>> and the evoked fif file. I guess this recommendation is mostly
>> to avoid mistakes when you work on a particular evoked dataset.
>> 
>> Best,
>> Alex
>> 
>> 
>> On Tue, Jan 29, 2013 at 5:33 AM, Hari Bharadwaj
>> <hari at nmr.mgh.harvard.edu> wrote:
>>> Hi Andy,
>>>    I am guessing that is there just to remind us that we could have
>>> applied transformations to the head coordinate frame like when using
>>> 'maxfilter -trans ...' and hence it is best to use the --meas file to
>>> which the inverse generated from this particular forward would be
>>> applied.
>>> 
>>> Regards,
>>> Hari
>>> 
>>> 
>>> On Mon, January 28, 2013 11:31 am, Andrew R. Dykstra wrote:
>>>> Hi all,
>>>> 
>>>> Is there a reason for the following text regarding the --meas argument of
>>>> mne_do_forward_solution:
>>>> 
>>>> "It is recommended that the average file is employed for evoked-response
>>>> data and the original raw data file otherwise."
>>>> 
>>>> If all the measurement file contributes is the sensor location/orientation
>>>> info and the device-head transform, does it matter from which file - raw
>>>> or
>>>> averaged - these data are pulled?  The quoted text from the manual would
>>>> suggest that a new forward solution be computed for each average file even
>>>> if they all derive from the same raw measurement, but that doesn't seem to
>>>> make sense.
>>>> 
>>>> Cheers,
>>>> Andy
>>>> _______________________________________________
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>>>> Mne_analysis at nmr.mgh.harvard.edu
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>>> 
>>> --
>>> Hari Bharadwaj
>>> PhD Candidate, Biomedical Engineering,
>>> Boston University
>>> 677 Beacon St.,
>>> Boston, MA 02215
>>> 
>>> Martinos Center for Biomedical Imaging,
>>> Massachusetts General Hospital
>>> 149 Thirteenth Street,
>>> Charlestown, MA 02129
>>> 
>>> hari at nmr.mgh.harvard.edu
>>> Ph: 734-883-5954
>>> 
>>> 
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> 



---------

Matti Hamalainen, Ph.D.
Athinoula A. Martinos Center for Biomedical Imaging
Massachusetts General Hospital

msh at nmr.mgh.harvard.edu
mhamalainen at partners.org






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