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相关概念视频

Post-traumatic Stress Disorder01:27

Post-traumatic Stress Disorder

29
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.
Symptoms and Behavioral Manifestations
A spectrum of distressing symptoms characterizes PTSD. Recurrent flashbacks, where individuals involuntarily relive traumatic events,...
29
Traumatic Memory01:20

Traumatic Memory

72
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...
72
Role of Amygdala in Memory01:16

Role of Amygdala in Memory

165
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.
One of the...
165
Repressed Memory01:16

Repressed Memory

62
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...
62
Dissociative Disorders01:27

Dissociative Disorders

32
Dissociative disorders represent complex psychological conditions characterized by disruptions in consciousness, memory, identity, or perception. These disruptions cause individuals to experience a disconnection from their thoughts, emotions, and memories. The phenomenon is not merely an occasional lapse in attention but a profound alteration in mental functioning that can severely impact daily life.
Dissociative Fugue
A hallmark feature of dissociative disorders is the dissociative fugue...
32
Role of Cerebellum and Prefrontal Cortex in Memory01:14

Role of Cerebellum and Prefrontal Cortex in Memory

372
The cerebellum, while traditionally associated with motor control, also plays a crucial role in memory, particularly in procedural memory, which involves learning motor tasks that become automatic through repetition. For example, studies have shown that when the cerebellum is damaged, individuals or animals lose the ability to learn conditioned motor responses, such as the conditioned eye-blink response in classical conditioning experiments with rabbits. This study demonstrates the...
372

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相关实验视频

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Developing Neuroimaging Phenotypes of the Default Mode Network in PTSD: Integrating the Resting State, Working Memory, and Structural Connectivity
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在创伤后应激障碍中创伤性记忆回忆期间解码威胁神经电路表示.

Kierra R Morris1, Michael Jaeb2, Joseph E Dunsmoor1,3

  • 1Department of Psychiatry and Behavioral Sciences, Dell Medical School, University of Texas at Austin, Austin, TX, 78701, USA.

Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology
|November 20, 2024
PubMed
概括

创伤后应激障碍 (PTSD) 中的创伤性记忆回忆激活了类似于处理普遍威胁的脑电路,特别是痛苦的刺激. 这表明创伤和威胁反应的共同神经生物学途径.

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科学领域:

  • 神经科学是一个神经科学.
  • 精神病学是一个精神病学.
  • 认知科学 认知科学

背景情况:

  • 了解创伤性记忆回忆的神经回路对于治疗创伤后应激障碍 (PTSD) 至关重要.
  • 以前的研究还没有完全澄清回忆创伤记忆如何参与参与威胁处理的大脑网络.

研究的目的:

  • 调查回忆创伤记忆是否激活神经电路模式,类似于在PTSD中一般化威胁刺激处理过程中发生的模式.
  • 探索创伤性记忆回忆和厌恶性刺激之间的神经表示的重叠.

主要方法:

  • 利用多变量模式分析 (MVPA) 来训练和对功能磁共振成像 (fMRI) 数据进行交叉测试的三个解码器.
  • 训练有素的"创伤"解码器在创伤期间的fMRI模式与PTSD女性中性叙述.
  • 在一个单独的队列中,训练有素的"冲击"和"奖励损失"解码器在威胁或奖励结果交付期间对神经模式进行解码.

主要成果:

  • 一个"冲击"解码器,训练在一个中/后面的岛屿网络,显示增加了在创伤性记忆回忆期间对冲击的预测.
  • "创伤"解码器预测了在突出处理网络的冲击传递期间的创伤回忆.
  • 在奖励损失处理和创伤记忆回忆之间没有发现重叠;在创伤回忆过程中,加剧的重新体验症状与更大的与冲击有关的神经活动相关.

结论:

  • 创伤性记忆回忆涉及与威胁重叠的神经电路,特别是痛苦的刺激处理.
  • 这些发现表明创伤后应激障碍中创伤记忆回忆和普遍威胁反应之间存在共同的神经机制.
  • 结果强调了突出处理网络和杏仁体/海马体在PTSD神经生物学中的作用.