[Mne_analysis] using inverse matrix from MNE

Daniel G. Wakeman dgwakeman at gmail.com
Wed May 19 21:04:13 EDT 2010
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Well, as for which is "more wrong" I'm not sure, it would probably  
depend on the particular specifics, however, personally, I would  
prefer the noise covariance fit the forward model than the average  
data, but both should provide you a solution.

D
On 20 May 2010, at 01:55, Ghuman, Avniel (NIH/NIMH) [F] wrote:

> I don't actually see any reason you would want to use the same  
> forward solution, just the same noise covariance matrix.  So, I  
> would use mne to make a new forward solution with the second run  
> then just use the noise covariance matrix from the first run to  
> create an inverse solution for the second run.
> ________________________________________
> From: Daniel G. Wakeman [dgwakeman at gmail.com]
> Sent: Wednesday, May 19, 2010 8:45 PM
> To: Erik B Beall
> Cc: mne_analysis at nmr.mgh.harvard.edu
> Subject: Re: [Mne_analysis] using inverse matrix from MNE
>
> In this case, I believe you can use the inversion from the first run
> on the second.
> Simply, open the second run's average with the first runs inverse
> operator ** in mne_analyze. This should work.
>
> **You should be aware of possible mislocalizations introduced doing
> this, because the person's head will not be in exactly the same
> position. I would recommend at least comparing the head positions
> between the two runs. If you have maxfilter available, I would
> probably use this to transform the head position.
>
> D
>
>
> On 20 May 2010, at 01:02, Erik B Beall wrote:
>
>> yes, sorry, same subject, scans acquired in adjacent scans of same
>> session.
>> Erik
>>
>> On Wed, May 19, 2010 at 7:55 PM, Daniel G. Wakeman
>> <dgwakeman at gmail.com> wrote:
>>> Hi Erik,
>>>
>>> Are these from the same participants & same recording session?
>>>
>>> D
>>> On 20 May 2010, at 00:49, Erik B Beall wrote:
>>>
>>>> I have a question about using the inverse matrix computed using MEG
>>>> data in MNE from a visual evoked experiment.  I have two scans,  
>>>> both
>>>> visual evoked experiments, and I want to take the inverse matrix
>>>> (and
>>>> associated noise covariance matrix) computed during scan 1 and  
>>>> apply
>>>> it to scan 2.  I don't think there is a way to do this using the
>>>> compiled MNE, but I have been trying to use the matlab toolbox
>>>> code to
>>>> read in the matrices (forward solution, inverse matrix and noise
>>>> covariance matrix) I've dumped from MNE run on scan 1.
>>>>
>>>> My question is, is there a way to apply the solution for scan 1 to
>>>> scan 2's dataset?  Can I do this using the matlab toolbox or is
>>>> there
>>>> a way to do this using MNE itself?  Does anyone know of specific
>>>> matlab commands from the MNE toolbox that
>>>> would allow us to do this?  I had thought
>>>> mne_read_inverse_operator.m
>>>> was the right command to read it
>>>> in, but I don't know how to use the matrix once read in.  Is  
>>>> there a
>>>> toolbox command for
>>>> applying it to the other dataset?  Thanks,
>>>> Erik Beall
>>>>
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>>>>
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>>>
>>
>>
>>
>> --
>> Erik Beall
>> Cleveland Clinic
>> U-15-Mellen Center
>> Cleveland OH, 44195-0001
>> 216-445-6110
>>
>> ebeall at gmail.com
>
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