A Yale team led by Elizabeth Goldfarb (School of Medicine and Faculty of Arts and Sciences) published findings in Science Advances showing how cortisol alters brain circuits for emotion and memory. In a double-blind experiment, participants swallowed either hydrocortisone or a placebo before viewing images in an fMRI, which tracks oxygenated blood flow as a proxy for brain activity. While viewing each picture, participants rated how the image made them feel. The researchers tested memory for the same pictures the next day, and each person completed both sessions (one drug, one placebo).
Rather than averaging minutes of data, the team analysed functional connectivity during single trials of roughly five seconds. These short, dynamic connectivity patterns predicted participants' emotional ratings and which images were remembered the following day. Both predictions were successful.
- Cortisol helped people remember emotional experiences.
- Cortisol made emotion-related networks more consistent and more strongly engaged.
- Cortisol made memory-related networks more specialized for emotional content and increased coordination between emotion and memory networks.
The researchers conclude that multiple dynamic brain mechanisms let people selectively remember emotional experiences under stress. Goldfarb noted that stress responses can be adaptive and help form strong memories for intense experiences. The study was supported by grants from the National Institutes of Health and was reported by Yale.
Difficult words
- cortisol — hormone released during stress response
- hydrocortisone — drug similar to cortisol used in experiments
- placebo — inactive substance given instead of a real drug
- double-blind — study design where neither participant nor researcher knows
- functional connectivity — measure of how brain regions interact over time
- oxygenated — having oxygen present in a fluid or tissue
Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.
Discussion questions
- How could stronger memories for emotional experiences after stress affect how people react to future events?
- What are possible benefits and possible harms when stress makes emotional memories stronger?
- How might analysing short, dynamic connectivity patterns change future research or clinical approaches to memory and emotion?
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