不同的恩格拉姆控制恐惧和灭绝记忆
Jordana Griebler Luft1, Bruno Popik1, Débora Aguirre Gonçalves1
1Laboratório de Neurobiologia da Memória, Departamento de Biofísica, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
Hippocampus
|February 24, 2024
概括
记忆的再巩固更新了原始的恩格拉姆,而灭绝形成了新的记忆. 这项研究表明,内膜皮质对灭绝记忆至关重要,破坏它会损害恐惧抑制.
科学领域:
- 神经科学是一个神经科学.
- 记忆研究 记忆研究
- 行为神经科学 行为神经科学
背景情况:
- 恩格拉姆细胞对于记忆存储和回忆至关重要.
- 记忆回忆可以涉及重新巩固 (更新原始记忆) 或灭绝 (抑制原始记忆).
- 目前尚不清楚灭绝是否会改变现有的恐惧引擎或创造新的恐惧引擎.
研究的目的:
- 为了调查灭绝是否形成一个新的Engram或修改原来的恐惧Engram.
- 为了确定记忆的再巩固或灭绝是否涉及到新的记忆痕迹或现有engrams中的修改.
- 检查底侧杏仁体 (BLA) 和下边膜 (IL) 皮层在恐惧记忆巩固,再巩固和灭绝中的作用.
主要方法:
- 在c-Fos-lacZ大鼠中使用了Daun02程序来诱导激活神经元的亡.
- 消除的神经元在记忆巩固和重新激活阶段被激活.
- 评估神经元剥离对恐惧记忆回忆和灭绝行为的影响.
主要成果:
- 消除在巩固和重新激活过程中激活的神经元显著影响了恐惧记忆,强调了 BLA engram 的作用.
- 破坏IL灭绝引擎重新激活了被抑制的厌恶记忆,证明了IL皮质在灭绝中的关键作用.
- 在去除在BLA.中测试灭记忆后激活的神经元时,没有观察到对恐惧记忆的影响.
结论:
- 灭绝记忆取决于形成一个新的记忆痕迹,与最初的恐惧图形不同.
- 阴下皮质是神经网络的关键节点,是导致灭绝的基础.
- 重新巩固重新激活了原来的记忆痕迹,而灭绝则建立了一个新的,抑制性记忆.
相关概念视频
01:16Role of Amygdala in Memory
217
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...
One of the...
217
01:20Traumatic Memory
89
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...
89
01:24Generalization, Discrimination, and Extinction
557
Generalization, discrimination, and extinction are key concepts in operant conditioning that influence how behaviors are learned and maintained.
Generalization occurs when a behavior reinforced in one context is performed in similar situations. For instance, a student who studies diligently for calculus and receives excellent grades might apply the same study habits to psychology and history, expecting similar results. Generalization shows how learning in one setting can influence behavior in...
Generalization occurs when a behavior reinforced in one context is performed in similar situations. For instance, a student who studies diligently for calculus and receives excellent grades might apply the same study habits to psychology and history, expecting similar results. Generalization shows how learning in one setting can influence behavior in...
557
01:15Functional Brain Systems: Limbic System
2.8K
The limbic system, often called the "emotional brain," is a complex set of structures located deep within the brain. The intricate network of the limbic system supports a wide range of psychological functions, from emotional regulation to memory formation and sensory processing. This functional brain region encompasses specific parts of the diencephalon and the cerebrum, integrating the higher mental functions of the cerebral cortex with the primitive emotional responses of the deep brain...
2.8K
01:16Repressed Memory
88
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...
88
01:09Preparedness and Phobias
102
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...
102