[Mne_analysis] question regarding mne_do_forward_solution

[Alexandre Gramfort]

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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>
> --
> 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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