1. A method for estimating cortical neural source activations of electrical voltage potentials from scalp site measurements of electroencephalograms (EEG) from a human subject that is executed by an electronic processor comprising electronic modules, the method comprising: specifying, by an electronic module, cortical neural sources within the brain of the subject; simulating, by one or more electronic modules, scalp site voltage potentials that correspond to scalp site voltage potentials which would be measured by electrodes of an EEG collection system worn by the subject, wherein the simulating comprises: (i) simulating activation potentials for the specified cortical neural sources; (ii) mathematically projecting the simulated cortical neural source voltage activations to actual scalp site measurement electrode locations of the EEG collection system worn by the subject; (iii) simulating scalp voltage potentials for one or more extra-cranial sources outside the brain; and (iv) calculating simulated scalp site voltage potentials from the projected simulated modeled cortical neural source voltage activations and the simulated extra-cranial scalp voltage potentials; receiving measurement signals for actual scalp site voltage potentials which originate from the EEG collection system worn by the subject; comparing, by an electronic module, the simulated scalp site voltage potentials and actual scalp site voltage potentials for the subject; adjusting, by an electronic module, parameters for simulating the cortical neural source voltage activations until the simulated scalp site voltage potentials generally correspond to the actual scalp site voltage potentials based on said comparison; and estimating, by an electronic module, cortical neural source activations for the subject from actual scalp site voltage potentials using the adjusted parameters.