1. A system for augmenting team performance via neurostimulation, the system comprising: one or more processors and a non-transitory memory having instructions encoded thereon such that when the instructions are executed, the one or more processors perform operations of: selecting a target brain state in a subject; associating the target brain state with specific brain regions; determining a HD-tCS neurostimulation needed to reach the specific brain regions to induce the target brain state in the subject; applying the determined HD-tCS neurostimulation to the subject and sensing, via real-time neuroimaging from both electroencephalography (EEG) and functional near-infrared spectroscopy (fNIRS), neural activity of the subject while the subject performs a behavioral task; based on the sensed neural activity, adjusting the neurostimulation of the subject to move the subject into a target brain state; and personalizing a cognitive model for the subject by mapping a set of estimated cognitive capacities of the subject onto a set of parameters, and applying the set of parameters to the cognitive model.