The orientation of the head model

Dear Brainstorm Community,

I understand that the leadfield gives the sensor value when there is a unit current dipole on cortex surface.
I would like to know the constrained orientation of the unit current dipole.
Is the positive side of the dipole outside or inside cortex surface?

Thank you very much.

Cortical dipoles point outwards from the cortical surface by default. Hence a positive current points outward and negative points inward.