The ERP components under interested in this proposal are P2, N270 and N400. P2 component is traditionally defined as the highest positive voltage observed between 20 and 110 ms after stimulus onset and is generally recorded over occipital region. N170 is commonly identified as the highest negative amplitude value observable around a latency of 130 to 210 ms after stimulus onset and its scalp topography is centered over occipito-temporal. N400, on the other hand, is a monophasic negative deflection that occur around 400ms after the onset of the stimulus and whose topography over the scalp, although more difficult to characterize, seems to be centro-parietal.