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Emotionally traumatic events often lead to memories that are exceptionally vivid and enduring, sometimes persisting with remarkable clarity throughout an individual's life. A classic example of this phenomenon is a person who survives a car accident. Even years later, they may recall every detail of the event with startling accuracy — the screeching of the tires, the jarring impact, and the acrid smell of burning rubber. Such vividness contrasts sharply with how an individual...
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Related Experiment Video

Updated: Jan 9, 2026

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Dynamic brain mechanisms supporting salient memories under cortisol.

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Cortisol enhances emotional memory by strengthening arousal networks and specializing memory networks. This study reveals how cortisol shifts brain activity to prioritize emotionally significant information for better recall.

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Area of Science:

  • Neuroscience
  • Psychology
  • Pharmacology

Background:

  • Cortisol is known to enhance memory for emotional experiences.
  • The specific neural networks underlying this memory enhancement remain largely unknown.

Purpose of the Study:

  • To investigate the dynamic brain network processes through which cortisol enhances emotional memory formation.
  • To identify the neural mechanisms linking cortisol, arousal, and memory.

Main Methods:

  • Pharmacological functional magnetic resonance imaging (fMRI) was combined with dynamic connectome-based predictive modeling (dCPM).
  • dCPM was used to identify whole-brain functional connectivity networks with high temporal resolution.
  • The study analyzed how these networks predict trial-level arousal and subsequent memory.

Main Results:

  • Distinct brain networks predict arousal (salience network) and memory (visual, frontoparietal, default mode networks).
  • Cortisol increased the overlap between networks involved in arousal processing and memory formation.
  • Arousal-predictive networks were more consistently engaged under cortisol, while memory networks specialized for emotional content.

Conclusions:

  • Cortisol amplifies arousal-predictive brain networks and tunes memory-predictive networks to prioritize emotional salience.
  • This dynamic process enhances the formation of emotional memories.
  • The findings reveal a neurobiological mechanism for cortisol's effect on emotional memory.