“…We assessed the extent to which the hippocampus was successfully activated by the target song, which directly captured toddlers' previous experience, and a reversed song, which corresponded to the target song played backward and thus maintained most of its features (e.g., voice, rhythm, tempo, and key) but modified its melodic pattern. Behavioral research has indicated that adults flexibly recognize learned songs in the face of some change in melody (19), suggesting that both types of stimuli successfully reinstate previous experiences. However, hippocampal activation in adults discriminates among similar memories; for example, adults show greater hippocampal activation when they remember events accurately with all of the details compared with when some details are incorrectly recalled (20,21).…”