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Memory is categorized into three major systems: sensory memory, short-term memory (STM), and long-term memory (LTM). These systems differ in their capacity and the duration for which they can hold information. Sensory memory captures raw sensory input from the environment, holding it for just a few seconds or less. For example, on hearing a brief, loud sound, like a car horn honking, the sound seems to linger in the mind for a moment even after it stops. This is an instance of sensory memory...
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Long-term memory is a relatively permanent type of memory, capable of storing vast amounts of information over extended periods. Its storage capacity is generally considered unlimited.
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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: Feb 5, 2026

Disrupting Reconsolidation of Fear Memory in Humans by a Noradrenergic β-Blocker
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Remote fear memory is sensitive to reconditioning.

Xianli An1, Fenfen Zhang2, Yuan Liu2

  • 1School of Educational Science, Yangzhou University, Yangzhou, China; Jiangsu Key Laboratory of Experimental & Translational Non-Coding RNA Research, School of Medicine, Yangzhou University, Yangzhou, China.

Behavioural Brain Research
|September 22, 2018
PubMed
Summary
This summary is machine-generated.

Remote fear memories, established through repeated trauma, show resistance to disruption. Reconditioning in the original context strengthens these memories, making them less susceptible to extinction.

Keywords:
Fear conditioningFear reconditioningRecent memoryRemote memoryStress sensitivity

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Area of Science:

  • Neuroscience
  • Psychology
  • Trauma Studies

Background:

  • Recurring traumatic events are prevalent, particularly in cases of child abuse and domestic violence.
  • The severity of mental disorders, including post-traumatic stress disorder (PTSD), correlates positively with the number of traumatic events experienced.

Purpose of the Study:

  • To investigate fear responses to extinction procedures after repeated fear conditioning stress.
  • To examine the impact of time intervals on fear memory consolidation and disruption.

Main Methods:

  • A contextual fear conditioning (Cond1) and reconditioning (Cond2) paradigm was employed, with intervals of 1 or 35 days between conditioning phases.
  • Animals were categorized into recent and remote fear memory groups based on the time interval between Cond1 and Cond2.
  • Fear responses were assessed following immediate extinction and retrieval-extinction procedures.

Main Results:

  • Remote fear memories reconditioned in the original context demonstrated resistance to immediate extinction and retrieval-extinction.
  • This resistance to disruption was observed even with very low shock intensities, insufficient to elicit fear in naive animals.
  • When reconditioning occurred in a novel context, remote fear memories led to significantly higher fear responses in the new environment.

Conclusions:

  • Remote fear memory exhibits enhanced sensitivity to reconditioning.
  • Established remote fear memories are resistant to post-reconditioning disruption, particularly when reconditioning occurs in the original context.
  • These findings have implications for understanding the persistence of trauma-related memories.