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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: Dec 5, 2025

Using Practice Testing, Public Speaking, and Source Monitoring to Examine the Influences of Learning Strategies and Stress on Episodic Memory
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Expectancy Violation Drives Memory Boost for Stressful Events.

Felix Kalbe1, Stina Bange1, Annika Lutz1

  • 1Department of Cognitive Psychology, Institute of Psychology, Universität Hamburg.

Psychological Science
|October 16, 2020
PubMed
Summary
This summary is machine-generated.

Enhanced memory for stressful events is linked to expectancy violation. Providing details about a stressor reduces memory enhancement, suggesting expectancy violation drives this effect.

Keywords:
cortisolinferior temporal cortexmemoryopen dataopen materialsprediction errorsalience networkstress

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Area of Science:

  • Neuroscience
  • Psychology
  • Cognitive Science

Background:

  • Stressful events are often vividly remembered, an adaptive survival mechanism.
  • This emotional-memory enhancement can contribute to stress-related disorders.
  • The role of expectancy violation in stress-related memory is not fully understood.

Purpose of the Study:

  • To investigate whether enhanced memory for stressful events is caused by expectancy violation.
  • To determine if manipulating expectancy violation affects memory consolidation under stress.

Main Methods:

  • Ninety-four participants underwent either a stressful or control episode.
  • Expectancy violation was manipulated by providing detailed versus minimal information about the stressor.
  • Memory for the event was assessed 7 days later, and brain activity was measured using functional near-infrared spectroscopy (fNIRS).

Main Results:

  • Prior information about the stressor abolished the memory advantage for core features of the event.
  • Subjective and hormonal stress responses were similar between informed and uninformed groups.
  • fNIRS data linked expectancy violation and memory formation under stress to the inferior temporal cortex.

Conclusions:

  • Detailed information about an upcoming stressor, reducing expectancy violation, attenuates memory for stressful events.
  • Expectancy violation plays a critical role in the memory enhancement associated with stressful experiences.
  • The inferior temporal cortex is implicated in processing expectancy violation and memory formation during stress.