Leah Alkalay (author) and Ashley Chen (mentor)
Maybe it’s the opening chord of a song you haven’t listened to since graduation or the smell of a meal your mom used to cook. These aren’t just vague recollections, they’re flashbulb moments that trigger an immediate psychological shift. Why do we recollect these memories from our youth with such vividness? And how do these help us navigate the stressors of the present?
The Reminiscence Bump
If we mapped a human life by the density of accessible memories, the graph would not show a steady incline. Instead, it would reveal a large peak between the ages of 15 and 25. Known as the “reminiscence bump” (Koppel & Rubin, 2016), this phenomenon describes middle-aged and older adults’ tendency to disproportionately recall events from adolescence to early adulthood.
The distinct peak is deeply rooted in how the developing brain is formed. During this window, the prefrontal cortex (PFC), the brain region responsible for complex decision making and personality expression, nears full maturation. Because these memories are encoded at the exact moment the ‘self’ is being constructed, every major experience becomes a part of the individual’s baseline identity. In other words, the brain treats this data as source code for the individual (Munawar et al., 2018).
Simultaneously, the adolescent brain operates under a unique chemical system. High levels of dopamine heighten activity in the hippocampus and the amygdala, treating the encoding of the events of our youth as high priority. Because these systems operate at peak sensitivity, the brain captures the environment in high definition, while later life, which is often marked by stability, may feel recorded in lower resolution.
Nostalgia and Stress Regulation
While nostalgia is often viewed as passive daydreaming, it is actually a high energy metabolic process. When a sensory trigger, like hearing a specific song or the aroma of your favorite meal, activates a nostalgic memory, the brain engages the ventral striatum, a key part of the reward circuit. Unlike standard memory retrieval, nostalgia triggers a mix of dopamine and oxytocin, initiating the evolutionary process of stress regulation. Studies have shown that retrieving positive autobiographical memories can actively dampen the release of cortisol, the stress hormone, following an acute stressor (Speer & Delgado, 2017).
This may function as an emotional “brake” post-stressor. For example, when an individual experiences anxiety, they may recall childhood memories where they felt more competent, such as a peaceful family celebration. These memories act as a psychological buffer, convincing the nervous system that the individual is safe in that present moment. Additionally, many people use a sensory re-grounding approach of listening to music from a good period of time to shift focus away from a current threat, interrupting the stress feedback loop (Speer & Delgado, 2017).
In summary, when the present environment feels threatening or exhausting, the brain accesses high definition formative memories to recalibrate the nervous system. In doing so, we can chemically buffer the psychological toll of current challenges, preventing burnout.
Identity as a Fuel
Fortunately, nostalgia serves a protective function. By tapping into the reminiscence bump, the PFC can mute the distress signals produced by the insular cortex, the brain region that processes physical and emotional pain. Indeed, research indicates that nostalgia has a psychological pain relieving effect, significantly increasing pain tolerance by shifting how the brain processes discomfort (Zhang et al., 2022).
Remembering who we are at our identity peak—at our most capable, social, or resilient time of our lives—provides us with the cognitive grit we need to push through our current struggles. By reflecting on these “best” versions of ourselves, we access a psychological state that increases motivation (Doshi et al., 2026).
At the end of the day, nostalgia is often regarded as a fixation of the past, but biologically, it is a tool that helps us look forward. Our brains keep specific memories at the top of our minds for a reason. These memories aren’t just passive reminders of good times; they form the scaffolds of who we are. When the world feels chaotic, they provide the self-continuity we need to stay grounded. The reminiscence bump isn’t our brains trying to escape the present, it’s a conscious strategy that prepares us for what lies ahead.
References
Doshi, H.S., Anderson, A.K. & Gonzalez, M.Z. (2026). Same emotion, different stimuli: A context-sensitive method to evoke nostalgia. Behavior Research Methods, 58, 105. https://doi.org/10.3758/s13428-026-02971-9
Koppel, J., & Rubin, D. C. (2016). Recent Advances in Understanding the Reminiscence Bump: The Importance of Cues in Guiding Recall from Autobiographical Memory. Current Directions in Psychological Science, 25(2), 135-149. https://doi.org/10.1177/0963721416631955
Munawar, K., Kuhn, S. K., & Haque, S. (2018). Understanding the reminiscence bump: A systematic review. PloS one, 13(12), e0208595. https://doi.org/10.1371/journal.pone.0208595
Speer, M., Delgado, M. (2017). Reminiscing about positive memories buffers acute stress responses. Nature Human Behavior, 1(5), 0093. https://doi.org/10.1038/s41562-017-0093
Zhang, M., Yang, Z., Zhong, J., Zhang, Y., Lin, X., Cai, H., Kong, Y. (2022). Thalamocortical mechanisms for nostalgia-induced analgesia. Journal of Neuroscience, 42(14), 2963-2972. https://doi.org/10.1523/JNEUROSCI.2123-21.2022