模式特定的恐惧逆行性失忆症
1Department of Psychology, University of California, Los Angeles 90024.
概括
海马对于记住与上下文相关的恐惧至关重要,但在学习后仅在有限的时间内. 对特定线索的恐惧,比如一个音调,是独立于海马记住的.
科学领域:
- 神经科学是一个神经科学.
- 行为心理学 行为心理学
- 记忆研究 记忆研究
背景情况:
- 恐惧是通过古典条件化迅速获得的.
- 了解恐惧记忆的神经基础至关重要.
研究的目的:
- 研究海马在获得恐惧记忆的神经基质中的作用.
- 确定海马在情境和恐惧记忆中的时间依赖作用.
主要方法:
- 鼠被经典地调节以使用脚震动来恐惧音调和背景.
- 在训练后的不同时间点 (1,7,14,28天) 在海马体中发生了病变.
- 在病变后,对背景和语调的恐惧反应被评估.
主要成果:
- 训练结束后1天的海马病变取消了上下文恐惧记忆.
- 在以后 (7,14,28天) 造成病变的老鼠中,上下文恐惧记忆仍然存在.
- 病变在任何时间点都没有影响与音调相关的恐惧记忆.
结论:
- 海马在巩固上下文恐惧记忆中起着时间有限的作用.
- 恐惧记忆不是一个单一的过程;上下文和暗示的恐惧记忆依赖于不同的神经机制.
- 这表明海马对于与上下文相关的初始恐惧记忆形成是必不可少的,但对于长期存储或提示特定的恐惧记忆却不是.
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