[FieldTrip] Signal Space Separation method for MEG data analysis

[McGowin, Inna]

Johanna, no problem.
"Presentation of electromagnetic multichannel data: The signal space
separation method" by Samu Taulu and Matti Kajola.
If anybody is interested in the SSS method implementation with FieldTrip it
would be great.



On Wed, Oct 31, 2012 at 11:23 AM, Johanna Zumer <johanna.zumer at donders.ru.nl
> wrote:

> Dear Inna,
>
> Would you mind posting the citation of the reference paper you mention,
> for the whole list to benefit?
>
> Cheers,
> Johanna
>
> 2012/10/31 McGowin, Inna <mcgoiv0 at wfu.edu>
>
> Tom,
>> In theory SSS method allows to extract signal from the dental work (due
>> to its magnetization) if correction of motion is implemented. MEG SQUIDS
>> can only detect DC magnetic fields if the source is in motion but removing
>> the motion from the raw signal with SSS allows to detected DC signals. I
>> have a reference paper if you are interested. Thanks
>>
>>
>> On Tue, Oct 30, 2012 at 5:08 PM, Tom Holroyd (NIH/NIMH) [E] <
>> tomh at kurage.nimh.nih.gov> wrote:
>>
>>> Just wanted to mention, the "SSS" method separates the signal into
>>> "inside" and "outside" the helmet (this is what MaxFilter does). So it is
>>> useless for removing dental artifacts.
>>>
>>> McGowin, Inna wrote:
>>>
>>>> Thank you Jörn for the info.
>>>>
>>>> I was looking for SSS to perform a DC analysis of MEG data with no
>>>> motion correction.
>>>> We have MEG datasets that are collected from subjects with high
>>>> magnetic noise such as dental work and/or brain surgery contamination. We
>>>> wanted to remove the signal that comes from these areas. Do you work with
>>>> such problems?
>>>>
>>>> Thanks,
>>>> Inna
>>>>
>>>> On Tue, Oct 30, 2012 at 5:07 AM, "Jörn M. Horschig" <
>>>> jm.horschig at donders.ru.nl <mailto:jm.horschig at donders.**ru.nl<jm.horschig at donders.ru.nl>>>
>>>> wrote:
>>>>
>>>>     Dear Inna,
>>>>
>>>>     I'm not aware of any implementation in FieldTrip. For the CTF system
>>>>     we got the ft_denoise_synthetic function, but afaik SSS is something
>>>>     NeuroMag specific and (I might be wrong here, because...) since we
>>>>     do not have a NeuroMag system I would guess that no one bothered to
>>>>     implement it. If you want to do so, you're welcome and we would be
>>>>     most happy to help out on various ends with all our abilities ;)
>>>>
>>>>     Best,
>>>>     Jörn
>>>>
>>>>
>>>>     On 10/25/2012 8:33 PM, McGowin, Inna wrote:
>>>>
>>>>>     Hello,
>>>>>     I would like to know if Signal Space Separation method for MEG
>>>>>     data analysis is available in the FieldTrip toolbox.
>>>>>
>>>>>     Thanks,
>>>>>
>>>>>     --     Inna
>>>>>
>>>>>
>>>>>
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>>>>>
>>>>
>>>>
>>>>     --     Jörn M. Horschig
>>>>     PhD Student
>>>>     Donders Institute for Brain, Cognition and Behaviour     Centre for
>>>> Cognitive Neuroimaging
>>>>     Radboud University Nijmegen     Neuronal Oscillations Group
>>>>     FieldTrip Development Team
>>>>
>>>>     P.O. Box 9101
>>>>     NL-6500 HB Nijmegen
>>>>     The Netherlands
>>>>
>>>>     Contact:
>>>>     E-Mail: jm.horschig at donders.ru.nl <mailto:jm.horschig at donders.**
>>>> ru.nl <jm.horschig at donders.ru.nl>>
>>>>     Tel:    +31-(0)24-36-68493 <tel:%2B31-%280%2924-36-68493>
>>>>
>>>>     Web: http://www.ru.nl/donders
>>>>
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>>>>
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>>>> >
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>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> Inna McGowin
>>>>
>>>>
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>>>> ------------
>>>>
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>>>
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>>
>>
>>
>> --
>> Inna McGowin
>>
>>
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-- 
Inna McGowin
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