[FieldTrip] Generate a source model where dipoles are perpendicular to the cortex surface

[Ying Li]

Dear all,

I tried to use fieldtrip to generate a source space and calculate lead
field matrix. I found that the dipoles in the source space has x, y, z
orientations. Is it possible to generate a source model where the dipole is
perpendicular to the cortex surface?

Actually this can be very helpful, since it will reduce the unknown
variables and make the inverse problem easier to solve. Also, there are
some inverse algorithms which require the dipole to be perpendicular to the
cortex surface.

Thanks a lot!!!

Best,

Ying
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