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Related Concept Videos

Traumatic Memory01:20

Traumatic Memory

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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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Preparedness and Phobias01:09

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Human fear responses to certain stimuli, such as darkness, heights, deep water, and blood, can often arise despite the absence of direct negative experiences. This phenomenon is rooted in evolutionary psychology, which posits that humans have developed a predisposition to fear stimuli that historically posed significant survival threats. This predisposition, known as preparedness, suggests that early humans who developed a fear of potentially dangerous entities, such as venomous snakes and...
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Post-traumatic Stress Disorder01:27

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Post-traumatic stress disorder (PTSD) is a psychiatric condition that arises following exposure to traumatic events such as natural disasters, forced displacement, or severe accidents. It significantly impairs individuals' ability to cope with daily activities and disrupts their emotional and psychological equilibrium.
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Role of Amygdala in Memory01:16

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The amygdala is a small, almond-shaped structure responsible for processing and storing memories, particularly those linked to emotions like fear and stress. It plays an essential role in the brain's response to emotionally significant events and often enhances memory formation by triggering stress hormone release. The amygdala is vital for encoding and retrieving memories associated with fear or stress, a process that is adaptive by helping organisms avoid dangerous situations.
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Repressed Memory01:16

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Repressed memories are a psychological phenomenon where memories of traumatic events are unconsciously blocked from a person's awareness. This process occurs as a defense mechanism, protecting the mind from the emotional impact of distressing or painful experiences. For example, a person who has experienced childhood trauma may grow up with no conscious recollection of the event. In such cases, the memories are thought to be buried deep within the subconscious, inaccessible to the conscious...
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Immunological Memory01:23

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Immunological memory, a pivotal pillar of the adaptive immune system, is responsible for the body's ability to remember and respond more swiftly and effectively to previously encountered pathogens. This remarkable feature is what makes vaccines so effective in preventing diseases.
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Related Experiment Video

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Extinction Training During the Reconsolidation Window Prevents Recovery of Fear
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Durable fear memories require PSD-95.

P J Fitzgerald1, C R Pinard1, M C Camp1

  • 1Laboratory of Behavioral and Genomic Neuroscience, National Institute on Alcohol Abuse and Alcoholism, NIH, Bethesda, MD, USA.

Molecular Psychiatry
|December 17, 2014
PubMed
Summary
This summary is machine-generated.

Postsynaptic density 95 (PSD-95) protein is crucial for maintaining long-term fear memories, particularly in the infralimbic cortex. Targeting PSD-95 may offer new treatments for anxiety disorders like PTSD.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Behavioral Science

Background:

  • Traumatic fear memories are persistent and dynamic, contributing to anxiety disorders.
  • The neural and molecular mechanisms of fear memory durability are not fully understood.
  • Postsynaptic density 95 (PSD-95) is a key synaptic protein involved in memory.

Purpose of the Study:

  • To investigate the role of PSD-95 in fear memory formation, retrieval, and maintenance.
  • To identify the neural basis of PSD-95's contribution to memory durability.

Main Methods:

  • Utilized a loss-of-function mutant mouse (PSD-95(GK)) lacking the guanylate kinase domain of PSD-95.
  • Employed ex vivo immediate-early gene mapping, in vivo neuronal recordings, and viral-mediated knockdown (KD).
  • Focused on the infralimbic (IL) cortex, anterior cingulate cortex (ACC), and prelimbic cortex.

Main Results:

  • PSD-95 is dispensable for recent fear memory but essential for precise, flexible, and remote fear memories.
  • PSD-95(GK) mice showed impaired remote memory retrieval linked to hypoactivation and altered neuronal activity in the IL cortex.
  • PSD-95 KD in the IL cortex impaired fear extinction and remote memory, affecting IL dendritic spines.

Conclusions:

  • PSD-95 in the IL cortex is critical for the durability of fear memories.
  • These findings suggest PSD-95 as a potential therapeutic target for anxiety disorders characterized by persistent fear memories.