For the record, and for MEG only :
It looks like (if the units of sensors are Tesla and measurement in mm) then the moments will be in nAm. (there is an extra scaling factor of 1000 in the spm code).
I am also looking into the EEG case now.
From: SPM (Statistical Parametric Mapping) [mailto:[log in to unmask]] On Behalf Of Vladimir Litvak
Sent: 25 May 2011 11:51
To: [log in to unmask]
Subject: Re: [SPM] dipole waveforms | units
It seems like the answer to your question is not that simple even for
your case where it's quite clear what's going on in terms of scaling.
I passed it to Fieldtrip developers who will look at how the units are
handled by their forward computation. When I hear back from them I'll
update you and the list.You can follow their progress via
On Mon, May 16, 2011 at 10:48 AM, Lars Meyer <[log in to unmask]> wrote:
> dear all,
> i am using spm_eeg_dipole_waveforms.m to retrieve dipole timecourses for two dipole priors in a vb-ecd- localisation. everything works fine, so no worries there, but i was wondering on what the units of the dipole amplitudes are… i remember some older post on the exact same question, have talked to the asker, but it seems there is no answer yet.
> or is there a working solution from the programmers of the above function?
> thanks in advance, and all best,
> Lars Meyer
> Max Planck Institute for Human Cognitive & Brain Sciences
> Department of Neuropsychology
> Stephanstraﬂe 1a
> 04103 Leipzig | Germany
> Office | +49 341 99 40 22 66
> Mail | [log in to unmask]
> Web | www.cbs.mpg.de/~lmeyer