[FieldTrip] Unit of simulated EEG using openMEEG

[Alexandre Gramfort]

hi,

OpenMEEG as used by default in Fieldtrip uses dipoles moments (not
current density) so it's expressed in Am. Current density is also
possible but not the default method exposed.

Alex

On Wed, Apr 8, 2015 at 10:08 AM, Munsif Jatoi <munsif.jatoi at gmail.com> wrote:
> Dear Hindriks,
>
> The leadfield matrix has got orientation and moments of dipoles. When it is
> multiplied by dipole numbers say 1 or 2 at certain location, it will be
> generating the voltage matrix. Put it in a more simple way, V= KJ +e where,
> V= potential (volts), K= leadfield and J= current density (A/m2). So the
> generated data has units of microvolts or the units of voltage. I hope you
> got the point.
>
>
> Thanks,
>
> Munsif.
>
>
> On Wed, Apr 8, 2015 at 3:32 PM, HINDRIKS, RIKKERT <rikkert.hindriks at upf.edu>
> wrote:
>>
>>
>> Dear all,
>>
>> Could anyone tell me what are the units of the entries in BEM leadfield
>> matrices generated using openMEEG?
>>
>> For example, if I multiply the matrix with a vector of dipole moments in
>> Am, do I get microVolts? (after taking the
>> average reference)
>>
>> Thanks a lot,
>> Rikkert
>>
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>
>
>
>
> --
> Munsif Ali H.Jatoi,
>
> Ph D Scholar,
> Centre for Intelligent Signals and Imaging Research,
> Universiti Teknologi PETRONAS,
> Malaysia.
>
> http://scholar.google.com.my/citations?user=Y6g6jOAAAAAJ&hl=en
>
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>
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