Memories of past events and experiences are what define us as who we are, and yet the ability to form these episodic memories declines with age, certain dementias, and brain injury. However, a study publishing in the open access journal PLOS Biology on September 28th by Mircea van der Plas and Simon Hanslmayr from the University of Glasgow and colleagues, shows that low frequency repetitive transcranial magnetic stimulation—or rTMS—delivered over the left prefrontal cortex of the brain can improve memory performance by reducing the power of low frequency brain waves as memories form.