 We plan to apply rTMS over left prefrontal cortex and over two control sites, during encoding of verbal and nonverbal items into episodic memory. Normal, healthy volunteers will be studied. The outcome measure will be performance on a subsequent memory test for words presented during left prefrontal rTMS, as compared to performance for words presented during rTMS over the control sites or without rTMS. This measure will indicate if left prefrontal stimulation can disrupt memory encoding of words relative to other stimulation sites or to no stimulation. 