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【学术笔记】海马及其以外脑区的空间学习与重现

  • 2026-05-18 16:36:53
【学术笔记】海马及其以外脑区的空间学习与重现

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【学术笔记】海马及其以外脑区的空间学习与重现

记录人:蔡海倩 苗成林实验室

审稿人:苗成林

2026年04月23日下午,受北大-清华生命科学联合中心PI苗成林邀请,奥地利科学技术研究院(ISTA)教授Jozsef Csicsvari在生命科学学院邓祐才报告厅带来一场题为“Diverse roles of hippocampal and medial entorhinal circuit activity in spatial goal learning”的精彩报告。

【精彩回顾】

海马体是记忆形成环路(尤其是空间记忆)的核心脑区。Jozsef Csicsvari教授的研究主要采用目标导向学习范式,如芝士板迷宫和放射状八臂迷宫,以探究海马体在目标学习、空间记忆及其重现过程中的功能。研究发现,在大鼠学习芝士板迷宫奖励位置的过程中,海马体会在奖励区域形成新的放电野(即重映射现象)[1],同时内侧内嗅皮层(MEC)中的网格细胞放电野也会在学习过程中向奖励区域靠拢[2]。

重现(recall)在记忆巩固中至关重要。Csicsvari教授团队开发了一种实时解码系统,能在毫秒级别识别大鼠在睡眠期间(特别是尖波涟漪事件期间)所重现的具体空间位置(即群体特异性重现),并通过干预特定位置的重现,发现该干预会破坏对应的空间记忆[3]。研究进一步表明,海马体这种内容特异性的重现对于引导前额叶皮层(PFC)神经元的相应活动至关重要;若海马体重现被阻断,PFC则无法同步接收相关记忆信号。

图1 MEC和CA1空间细胞放电野会向新的学习目标移动

那么,能否从睡眠中推断认知状态呢?通过对大鼠在空间学习任务后长达20小时的连续睡眠监测,研究团队观察到海马位置细胞的表征存在漂移现象。非快速眼动睡眠(NREM)会加速该重现模式的漂移,促进记忆表征的优化与巩固;而快速眼动睡眠(REM)则表现出拮抗作用,倾向于维持或平衡这种漂移,防止表征过度偏离。这揭示出睡眠并非简单地“复习”过去经验,而是通过不同睡眠阶段的协同,主动对记忆表征进行重组与优化,从而实现系统性的记忆巩固[4]

图2 芝士板空间学习任务后的睡觉/休息期间发生重激活漂移

近期关于“雪崩动力学”的研究进一步发现,通过对网络状态的分析,海马体在睡眠期间表现出规模不变性的动力学特征(如α指数),该参数能够预测动物的空间记忆表现。这意味着即使不考察具体的神经重现内容,仅通过网络波动的统计特性即可推断动物的学习效果[5]。

Csicsvari教授团队也关注了其他脑区在空间学习任务中的表现。他们在动物学习全程监测中发现,在学习初期,内侧前额叶皮层(mPFC)的神经状态在不同任务方案间呈现“闪烁”式波动;直至任务掌握后,mPFC的表征才趋于收敛并稳定,形成与海马体相似的空间逻辑[6]。

从因果性证据到预测模型,再到跨脑区协同机制,Jozsef Csicsvari教授团队持续致力于揭示睡眠与学习过程中复杂的网络动力学,为理解空间记忆的形成、巩固与长期演化提供了新的科学依据与研究思路。

参考文献

1. Dupret, D., O'Neill, J., Pleydell-Bouverie, B. et al. The reorganization and reactivation of hippocampal maps predict spatial memory performance. Nat Neurosci 13, 995–1002 (2010).

2. Boccara CN, Nardin M, Stella F, O'Neill J, Csicsvari J. The entorhinal cognitive map is attracted to goals. Science. 2019 Mar 29;363(6434):1443-1447.

3. Gridchyn I, Schoenenberger P, O'Neill J, Csicsvari J. Assembly-Specific Disruption of Hippocampal Replay Leads to Selective Memory Deficit. Neuron. 2020 Apr 22;106(2):291-300.e6.

4. Bollmann L, Baracskay P, Stella F, Csicsvari J. Sleep stages antagonistically modulate reactivation drift. Neuron. 2025 May 7;113(9):1446-1459.e6.

5. Predrag Živadinović, Fabrizio Lombardi, David Dupret, Charlotte Boccara, Sofia Taveira, Juan Ramirez-Villegas, Gašper Tkačik, Jozsef Csicsvari.The scaling behavior of hippocampal activity in sleep/rest predicts spatial memory performance.

bioRxiv 2026.03.11.711043.

6. Heloisa S. C. Chiossi, Michele Nardin, Gašper Tkačik, Jozsef L. Csicsvari. Learning reshapes the hippocampal representation hierarchy. bioRxiv 2024.08.21.608911.

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  1. CONNECT:[ UseTime:0.001033s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001228s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000594s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000590s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001205s ]
  6. SELECT * FROM `set` [ RunTime:0.000446s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001554s ]
  8. SELECT * FROM `article` WHERE `id` = 489291 LIMIT 1 [ RunTime:0.001042s ]
  9. UPDATE `article` SET `lasttime` = 1779098618 WHERE `id` = 489291 [ RunTime:0.006354s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000657s ]
  11. SELECT * FROM `article` WHERE `id` < 489291 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.004733s ]
  12. SELECT * FROM `article` WHERE `id` > 489291 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001131s ]
  13. SELECT * FROM `article` WHERE `id` < 489291 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004923s ]
  14. SELECT * FROM `article` WHERE `id` < 489291 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.008787s ]
  15. SELECT * FROM `article` WHERE `id` < 489291 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004468s ]
0.210726s