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Non-invasive scalp measurements of electric potential differences (EEG) [as well as magnetic field measurements (MEG)] can be used for estimating the electric neuronal activity distribution (current density vector field) on the cortex. The methods proposed here are LORETA (Pascual-Marqui 1999, Pascual-Marqui et al. 1994), standardized LORETA (sLORETA) (RD Pascual-Marqui 2007, Pascual-Marqui 2002), and exact LORETA (eLORETA) (RD Pascual-Marqui 2007, Pascual-Marqui 2009, R. D. Pascual-Marqui et al. 2011).