Methods: 30 healthy subjects (of which 16 women) will be included after written consent. They will receive after randomization 2 sessions of rTMS in cross over at 1Hz and 20Hz at 30 days interval. An EEG and a P50 evoked potential will be done before and after rTMS. The site of stimulation will be determined by neuronavigation and will correspond to the maximal activation cluster generated by a language task during functional magnetic resonance imaging. The main judgment criterion is the S2/S1 ratio of the P50. The potential secondary effects will be evaluated (UKU adapted). The secondary criteria are the comparisons before and after rTMS of EEG spectrums in the alpha, beta and gamma bands.