At the same time, the researchers examined brain activity occurring on slow and fast time scales, also called low- and high-frequency neural activity. They discovered that when a person is effectively creating new memories - in this case, remembering one of the presented words - alignment between brain regions tends to strengthen with slow waves of activity but weaken at higher frequencies.
Areas of the brain identified in this paper - the frontal, temporal and medial temporal lobes - have long intrigued neuroscientists because of their crucial role in such memory functions.