Source localization with minimum norm

Robert Oostenveld r.oostenveld at FCDONDERS.RU.NL
Mon Mar 16 22:22:47 CET 2009

On 5 Mar 2009, at 22:20, Victoria Eugenia Montes Restrepo wrote:
> I'm using the minimumnormestimate() function from the Forwinv
> toolbox with a four-shell spherical head model, and assuming
> orthogonal dipoles orientation. When applying this function, I
> obtain the strengths and power at each source location. If my
> objective is choosing a single source, which procedure should I use
> after estimation of these current densities?

Hi Victoria,

Why do you start with a distributed source model (which is what
minimumnormestimate is for) if you are interested in modelling the
data with a single dipole? If you think that a single dipole is able
to explain the data, you should search for a single dipole solution.
That may mean that you also shoudl search for the optimal position and
not only the optimal strength of all dipoles at the same time (which
is only what MNE does). Perhaps you should look at the fieldtrip/
dipolefitting function.

best regards,

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