NEWS Mental Health News There's a Reason Why Stressful Memories Stick Out in Our Minds By Joni Sweet Joni Sweet Joni Sweet is an experienced writer who specializes in health, wellness, travel, and finance. Learn about our editorial process Updated on October 28, 2021 Fact checked Verywell Mind content is rigorously reviewed by a team of qualified and experienced fact checkers. Fact checkers review articles for factual accuracy, relevance, and timeliness. We rely on the most current and reputable sources, which are cited in the text and listed at the bottom of each article. Content is fact checked after it has been edited and before publication. Learn more. by Aaron Johnson Fact checked by Aaron Johnson Aaron Johnson is a fact checker and expert on qualitative research design and methodology. Learn about our editorial process Share Tweet Email Print Martin Dimitrov / Getty Images Key Takeaways A new study found that recollections of objects related to a stressful event can be closely linked in our brains, which could explain why memories of these situations are so strong.Experts say there may also be other factors, such as hormonal responses and important lessons learned from challenging situations, that cause imprints of stressful memories.While negative memories can be upsetting, you can reduce their impact by seeing a therapist, journaling, and avoiding triggers. Why is it that we can hardly remember what we had for breakfast, but we can’t forget stressful moments in our lives? Recent research may have just uncovered the key reason why. In a study published this month in the journal Current Biology, a team of researchers from Germany put people through a stressful job interview simulation, then analyzed their brain activity when they recalled aspects of the event. The results showed that people’s brains formed closely linked memories of objects in stressful scenarios, potentially making them more distinct in the mind. Let’s take a closer look at the research on stressful memories, along with tips on how to feel less triggered by them. The Study For the study, researchers from Ruhr-University Bochum recruited 64 people to participate in a mock job interview in front of a two hiring managers. About half the group (33 participants) experienced a stressful version of the simulation, in which the interviewers were neutral and reserved. The others participated in a friendlier job interview with encouraging hiring managers and the freedom to share their aspirations and hobbies. Throughout the interviews, the participants were exposed to 24 objects (like a soda can, a bag of cough drops, a teapot, and a stapler). The interviewers used about half of the objects in front of each participant. The next day, the participants underwent functional magnetic resonance imaging (fMRI) scans and memory tests related to the objects from the previous day. The results showed that those who participated in the stressful interview had a stronger memory of the objects than those in the friendly interview group. Jon Nash, CMHC Stressful memories tend to be stronger than neutral memories because more areas of the brain are getting activated. — Jon Nash, CMHC The researchers also found that memory traces of objects used in the stressful interview were more closely linked than those of objects that hadn’t been used. Since brain scans of participants from the friendly interview group did not have this result, it suggests that the brain may set stressful memories apart from other experiences. “Stressful memories tend to be stronger than neutral memories because more areas of the brain are getting activated. This study showed that stressful situations recalled later activated both the hippocampus and the amygdala,” explains Jon Nash, CMHC, a licensed clinical mental health counselor at Thriveworks in Sandy, Utah, who specializes in anxiety and trauma. “Where more connections are present, recall can have more details.” While the study deepens scientific understanding of the way stressful events imprint themselves on our brains, more research is needed to understand how other factors may affect this phenomenon, says Desreen N. Dudley, PsyD, a mental health quality consultant and clinical psychologist at Teladoc. “While we all may certainly show a tendency to recall more emotional and traumatic memories more readily than those which are more neutral, I believe there are important factors which influence the extent to which such emotional memories persist in one’s mind and negatively impact one’s life,” she says. Dr. Dudley continues: “For example, other research has found memories which elicited positive emotions are longer-lasting compared to those which elicit negative emotions, with memories that triggered negative emotions fading over time, except in individuals who reported experiencing depression.” Ask a Therapist: How Do I Deal With Bad Memories That Pop Into My Head? Why Stressful Memories Stand Out Experts say there may be other reasons why stressful memories can feel so strong, beyond the findings of this study. One potential explanation may have to do with our brain’s primary fear responses, which can be triggered by stressful events. “In these responses, we get different hormones released into our bloodstream to prepare to respond to the situations presented. Adrenaline is one of these hormones that increase our level of awareness. With heightened awareness, it is not surprising that more details could be recalled,” explains Nash. Desreen N. Dudley, PsyD The stressful memories tend to linger for the purposes of people being more alert to recognizing signs of a similar situation, which may lead to the same negative feelings, so that they are more adept at avoiding it. — Desreen N. Dudley, PsyD Another reason stressful memories can feel more vivid is because those challenging situations teach us important lessons that can serve us in the future, says Dr. Dudley. “This may be in the form of a mistake made, a relationship lost, a risky decision, or being exposed to a threat of emotional or physical harm which triggered the brain’s autonomic nervous system protective response of fight, flight, or freeze,” she says. “The stressful memories tend to linger for the purposes of people being more alert to recognizing signs of a similar situation, which may lead to the same negative feelings, so that they are more adept at avoiding it.” Earliest Memories Start at Age Two and a Half, Study Finds Managing the Impact of Negative Memories Certain mental health conditions, such as depression, anxiety, and post-traumatic stress disorder (PTSD), can cause people to relive stressful memories over and over again. But even people without diagnosed conditions can dwell on things they’d prefer to forget, like an argument with a loved one or a job interview gone wrong. How can we temper the effect of negative memories on our emotional wellbeing? “A lot of research shows that stressful memories that have problematic results, such as intrusive levels of recall or bringing up distressing levels of emotions upon recall, happen because the memory is left feeling unresolved. Therapy can help to create the necessary resolutions and have a lasting result on the emotional response,” says Nash. You can also use techniques to work through stressful memories on your own. Dr. Dudley suggests journaling about the memory, challenging your beliefs or thoughts about that memory, and creating a plan of action for when you’re exposed to triggers of that memory. “Remind yourself that it is just a memory, something that has already happened, and a memory can’t hurt you,” she says. What This Means For You Wondering why you can’t stop ruminating about something stressful that happened to you? The results of a new study may explain why. It found that memories of objects associated with a stressful situation are closely linked in our brains, which may cause the memory of it to be stronger than that of a mundane event.While stressful events happen to everyone, remembering them can be upsetting. You may be able to find peace by writing about the situation in a journal, challenging your beliefs about that memory, and figuring out how to self-soothe when you’re exposed to a trigger. A therapist can also provide additional support. This Is Why We Associate Memories So Strongly With Specific Smells 4 Sources Verywell Mind uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. Bierbrauer A, Fellner M-C, Heinen R, Wolf OT, Axmacher N. The memory trace of a stressful episode. Current Biology. Published online October 2021. DOI:10.1016/j.cub.2021.09.044 Hakamata Y, Mizukami S, Izawa S, et al. Basolateral amygdala connectivity with subgenual anterior cingulate cortex represents enhanced fear-related memory encoding in anxious humans. Biological Psychiatry: Cognitive Neuroscience and Neuroimaging. 2020;5(3). doi:10.1016/j.bpsc.2019.11.008 Roley ME, Claycomb MA, Contractor AA, Dranger P, Armour C, Elhai JD. The relationship between rumination, PTSD, and depression symptoms. Journal of Affective Disorders. 2015;180. doi:10.1016/j.jad.2015.04.006 Travagin G, Margola D, Revenson TA. How effective are expressive writing interventions for adolescents? A meta-analytic review. Clinical Psychology Review. 2015;36. doi:10.1016/j.cpr.2015.01.003 By Joni Sweet Joni Sweet is an experienced writer who specializes in health, wellness, travel, and finance. 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