 The experimental task will test the impact of prefrontal stimulation by tDCS Anodal compared to Sham over left DLPFC of healthy adult bilingual subjects during two tasks relying on lexical strategies: a picture naming task in L1 and L2 and a word translation task. The EEG correlates of these tasks performed following tDCS will be analysed, which allows us to investigate precisely the spatiotemporal brain dynamics underlying the behavioural modifications induced by the modulation of left frontal areas. The hypotheses are: 