At a fitness class I taught recently, a room packed with middle-aged adults squeezed into their old low-rise jeans and tracksuits and lost their minds to their middle school jams. People were laughing, scream-singing lyrics and dancing with a level of commitment they probably hadn't brought to anything in years. Afterward, I kept wondering: why did a cheery playlist from 20 years ago hit so hard?
The answer, according to Sarah Hennessy, PhD, a cognitive scientist at the University of Arizona who studies music-evoked nostalgia, is something called a "nostalgic reset."
"When we feel nostalgic, we draw on typically positive memories of the past to enhance our present feelings," she explains, "reminding ourselves that we exist within a continuous life story and that things can be better in the future because they have been better in the past."
What is a "nostalgic reset"?
The concept is simple: You intentionally listen to music, watch shows or revisit media from your past — particularly from your middle school or high school years — as a way to calm your nervous system when you're feeling anxious, stressed or overwhelmed.
"The idea that it conveys — evoking feelings of nostalgia for the past to help regulate emotions in the present — has been studied for many years," Hennessy says. Michael S. Valdez, MD, a medical director with a background in neurology, agrees: "People have always used music, places and memories to reset how they feel. What's new is that we're talking about it more directly."
The history of nostalgia is wilder than you'd think. The term was coined in the 16th century by Johannes Hofer, a Swiss physician who believed it was a serious "cerebral disease" — a "neurological illness of essentially demonic cause." He observed that soldiers serving far from home developed symptoms like intense homesickness and loss of appetite, often triggered by familiar sounds. So what was once classified as a military health crisis is now, effectively, a wellness trend.
What's the science behind this?
To find out what happens in the brain during a nostalgic listening session, Hennessy used fMRI imaging technology in her research. Participants listened to personally nostalgic music while inside the scanner. The results showed activity in the brain's reward regions — the same areas that respond to food — as well as in the default mode network, associated with self-referential and narrative processing.
Think of the default mode network as the part of your brain that narrates your life story back to you. Even more striking, participants showed activity in the visual cortex despite keeping their eyes closed. So when you hear a song tied to a memory, your brain is actually playing the scene back like a movie.
Crucially, none of this happened at the same intensity when participants listened to songs they merely recognized but didn't feel nostalgic for. The effect isn't just about familiarity — it's about that specific, bittersweet, time-travel feeling.
Licensed therapist John Sovec explains that familiar sounds signal safety to the brain, triggering the release of feel-good neurochemicals dopamine and oxytocin while counteracting cortisol and adrenaline, the stress hormones. Your old playlist is, in effect, a natural mood stabilizer.
Teenage songs just hit different
You may have noticed it's almost never a recent song that sends you into that blissful, floaty state. It's usually something from when you were 14 or 16. That's not a coincidence — it's a documented psychological phenomenon called the "reminiscence bump."
The reminiscence bump refers to our well-documented tendency to have unusually vivid memories from roughly ages 10 to 30, the period when we're forming our identities, experiencing emotional "firsts" and making intense social connections. Research suggests the prime years for music may be even narrower: ages 9 through 19.
"My advice is to find the music you were listening to between ages 9 and 19 and see what it feels like to listen to it and mentally time-travel," says Hennessy. Those songs aren't just songs — they're psychological anchors tied to who you were becoming.
Nostalgia has also been shown to alleviate loneliness, increase our sense of meaning in life and improve "self-continuity" — our sense of being a coherent self across time. Hennessy notes that we're actually more likely to feel nostalgic when we're already in a negative state, likely because our brains and bodies know nostalgia can alleviate this discomfort.
How to make it work for you
· Start in your reminiscence bump: Search for top hits from any year between ages 9 and 19. That involuntary full-body response — the gasp, the "I'd forgotten about this song!" — is exactly what you're looking for.
· Choose music tied to positive memories: The benefits tend to be specific to memories that were positive at the time. Music is tied to both happy and painful memories, so be intentional — skip the heartbreak soundtrack.
· Be deliberate about it: The most effective nostalgic reset is an intentional one. Put on headphones, close your eyes and let yourself go somewhere. Think of it as a quick mental field trip, not background music.
· Try pairing it with grounding techniques: Sovec suggests combining nostalgic listening with focused breathing or journaling about the sensations and memories that come up, to make it a genuine tool for calming your nervous system.
· Do it with others: "So much of nostalgia is remembering moments of social connectedness," says Hennessy. Listening to nostalgic music with others may offer even greater benefits than solo listening, particularly when the music is tied to shared memories.
The bottom line: Keep it simple, and don't overdo it. "It's meant to reset you, not keep you stuck in the past," says Valdez. "If you come out of it feeling more grounded, it's doing what it's supposed to do."