Stress can change what we remember, particularly when an experience is emotionally intense or personally meaningful. Researchers at Yale University have now uncovered important clues about how this happens inside the brain.
Cortisol, a hormone released during stressful situations, can strengthen emotional memories. However, understanding precisely how cortisol strengthens memories has been challenging.
Key Takeaways
- Cortisol strengthens emotional memories by changing brain networks involved in emotion and memory
- The hormone improves participants' ability to remember emotionally significant experiences
- Stress can be adaptive and improve memory for emotional events
What the researchers found
The study reveals that cortisol strengthens emotional memories by changing how brain networks involved in emotion and memory function and communicate with one another.
How the study was conducted
The Yale team conducted an experiment in which participants took a pill containing either hydrocortisone, a form of cortisol, or an inactive placebo. They then viewed a series of pictures while undergoing functional MRI (fMRI) scanning.
Brain network activity
The researchers analyzed functional connectivity during individual trials lasting only around five seconds. This approach allowed them to identify patterns of brain activity that could predict two different outcomes: how emotionally intense participants found a picture and whether they would remember that picture the following day.
By the numbers
- 5 seconds: the duration of individual trials used to analyze brain network activity
- Double-blind design: the study's approach to compare how the same person's brain responded with and without the additional cortisol
- Science Advances: the journal where the study was published
Cortisol effects on brain networks
Cortisol improved participants' ability to remember emotionally significant experiences. The hormone also strengthened emotional memory through distinct changes in the brain networks responsible for processing emotion and forming memories.
Implications for learning
The findings suggest that connecting information to something exciting, personally important, or emotionally engaging could make it easier to remember, particularly during stressful situations.
According to Elizabeth Goldfarb, corresponding author of the study, "Stress responses are fundamentally adaptive and can help you form strong memories -- but this is specific to experiences that you find to be emotionally intense or meaningful."
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Why emotional experiences can be so memorable
The results help explain why stress does not necessarily improve memory for everything. Instead, its benefits appear to be selective, making experiences that feel particularly emotional or significant more memorable.
What this means for readers in India
Understanding how cortisol affects memory can have implications for learning and memory strategies, particularly in situations where stress is unavoidable. By recognizing the role of emotional intensity in memory formation, individuals can develop more effective methods for retaining information and recalling memories.
Expert perspective on stress and memory
Elizabeth Goldfarb, an assistant professor of psychiatry at Yale School of Medicine, emphasizes the importance of understanding how stress can be helpful in forming strong memories. Her lab is interested in exploring how stress can be adaptive and improve memory for emotional events.
Implications for daily life
The study's findings can be applied to daily life, particularly in situations where stress is inevitable. By recognizing the role of emotional intensity in memory formation, individuals can develop strategies to improve their memory and learning abilities.
Frequently Asked Questions
What is cortisol and how does it affect memory?
Cortisol is a hormone released during stressful situations that can strengthen emotional memories by changing brain networks involved in emotion and memory.
How can I improve my memory for emotional events?
By recognizing the role of emotional intensity in memory formation, individuals can develop more effective methods for retaining information and recalling memories.
Is stress always bad for memory?
No, stress can be adaptive and improve memory for emotional events, but its benefits appear to be selective, making experiences that feel particularly emotional or significant more memorable.
