Yale study reveals how cortisol strengthens emotional memories — SkimNews
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- Yale researchers published findings in Science Advances showing cortisol reshapes communication between emotion and memory brain networks, selectively strengthening memories for emotionally intense experiences.
- Elizabeth Goldfarb, assistant professor of psychiatry at Yale School of Medicine and a Wu Tsai Institute member, led the study with co-authors Rajita Sinha and Todd Constable, supported by National Institutes of Health grants.
- Participants took either hydrocortisone or a placebo in a double-blind, crossover design completed twice per person, then viewed pictures during fMRI scanning and were tested on recall the following day.
- The team analyzed functional connectivity during ~5-second individual image-viewing trials — rather than the several-minute windows typical in fMRI studies — and successfully predicted both emotional intensity ratings and next-day memory from those snapshots.
- Cortisol produced more consistent activity in emotion networks, made memory networks more specialized for emotional information, and increased coordination between the two systems.
- Goldfarb said the effect is selective rather than general: cortisol helps the brain prioritize emotionally meaningful information, and connecting new material to exciting or personally important elements may boost retention under stress.
Why it matters: The study pinpoints separable brain mechanisms — emotion-network engagement, memory-network specialization, and cross-network coordination — through which cortisol acts, overturning the simpler view that stress hormones strengthen memory through a single region. Goldfarb's practical takeaway for learners: linking new information to emotionally engaging elements may improve recall when stressed.
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