自我回避主导了海马体重复播放的选择
bioRxiv : the preprint server for biology
|July 29, 2024
概括
大脑在静止期间避免重复最近的路径,更喜欢未来的轨迹. 中部内耳皮层输入以后能够重复过去的经验,揭示神经序列是如何生成的.
科学领域:
- 神经科学是一个神经科学.
- 计算神经科学是一种神经科学.
背景情况:
- 大脑产生自发的神经活动序列,包括海马回放,没有外部输入.
- 静止期间的海马体重复序列代表了过去的经验或未来的预测,但它们的生成机制尚不清楚.
研究的目的:
- 研究控制海马重复序列的选择和时间组织的原则.
- 阐明皮质输入在塑造海马体重播动态中的作用.
主要方法:
- 从大批海马位细胞组合中记录在自由行为老鼠中的位置细胞.
- 利用皮质输入的光遗传学操纵来改变神经活动.
- 采用一个破坏对称性的吸引器模型来模拟序列生成.
主要成果:
- 河马重复强烈避免最近穿过的路径,优先考虑在停止运动后立即未来的轨迹.
- 重复序列在短时间范围内表现出自我回避,与避免过去的行为轨迹不同.
- 稍后的时间窗口 (停止后的几秒钟) 显示了过去的轨迹重复的主导地位.
- 光遗传学乱证实,中枢内皮层的输入对于以后重播过去的经验至关重要.
结论:
- 海马体重复选择受自我避开原则的支配,时间动态受运动停止的影响.
- 一个经过修改的吸引器模型,结合介质内皮层输入,准确地预测了重播的观察到的时间组织.
- 中介内皮质在维护偏向海马重复的记忆痕迹方面发挥着至关重要的作用,为序列生成提供了洞察力.
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