High frequency stimulation will by applied in order to achieve activation of the stimulated brain area and possibly induce LTP like plasticity. The stimulation protocol will be 33 trains of 10 Hz for 3 seconds, ITI of 20 seconds. The total treatment duration will be 759 seconds with 990 pulses. . For that purpose the investigators have designed a special cooling system for our coils and used them successfully in our healthy volunteers study (Levkovitz et al., 2007, accepted).