在学习过程中编码的下边缘皮层引文减弱了恐惧的泛化
Rajani Subramanian1, Avery Bauman1, Olivia Carpenter1
1Department of Psychological Science, Program in Neuroscience and Behavior, Vassar College, Poughkeepsie, NY 12603 USA.
概括
这项研究揭示了在下边缘皮层的一个特定的神经图像抑制了恐惧的泛化. 激活这个engram可以减少对模两可的威胁的结,而沉默则会增加概括性,为焦虑障碍提供了洞察力.
科学领域:
- 神经科学是一个神经科学.
- 行为科学 行为科学
- 认知科学 认知科学
背景情况:
- 一般化通过将过去的经验应用于新情况,使适应性行为成为可能.
- 阴下皮层 (IL) 涉及到概括,但其精确的机制尚不清楚.
- 神经内图,特定的神经元组,对于记忆的存储和表达至关重要.
研究的目的:
- 为了调查IL皮层中的一个学习的引号是否会影响普遍的恐惧反应.
- 阐明IL图形在一般化过程中调节防御行为中的作用.
主要方法:
- 在小鼠中,帕夫洛夫防御性调节,随后呈现一个概括刺激.
- 化学基因对IL活性进行操纵,以评估其在泛化中的全球作用.
- 活动依赖的engram"标记" (ArcCreERT2 x eYFP) 用于识别和操纵特定的神经元群体.
主要成果:
- IL活动调节防御行为;沉默IL导致普遍结,而刺激促进扫描.
- 一个特定的IL engram,主要在2/3层,与泛化刺激有关.
- 选择性化学遗传沉默增加了IL结,而刺激减少了它,表明恐惧泛化的减弱.
结论:
- IL皮质在抑制对模两可的刺激的一般化条件反应方面发挥着至关重要的作用.
- 一个学习的IL engram功能在遇到模两可的威胁时减弱条件反应.
- 研究结果表明,焦虑和创伤后应激障碍 (PTSD) 是潜在的治疗点,这些疾病的特征是过度泛化.
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