Marchal Paul, Salin Paul A, Missaire Mégane, Rampon Manon, Carponcy Julien, Parmentier Régis, Poe Gina, Malleret Gaël, Comte Jean-Christophe
University Claude Bernard Lyon 1, Forgetting processes and cortical dynamics' team, Centre de Recherche en Neurosciences de Lyon, Bron, France.
Department of Integrative Biology and Physiology, University of California Los Angeles, Los Angeles, CA, USA.
Nat Commun. 2025 Mar 26;16(1):2973. doi: 10.1038/s41467-025-57976-3.
Interactions among brain areas are essential to most cognitive functions. Neuronal interactions between these areas depend on the modulation of synaptic strength. However, this modulation remains poorly understood. We recorded evoked responses at four hippocampal pathways in freely moving male rats across 24 hours. We show that synaptic strength at these pathways oscillates with a very slow periodicity and correlates with the durations of vigilance states. A model based on hypnogram data and synaptic strength at one pathway was able to predict the evolution of synaptic strength at most pathways, except one. These results reveal that the temporal succession of vigilance states may contribute to memory processes through rapid modulation of synaptic strength at several pathways during the sleep-wakefulness cycle, suggesting that memory processes are not only dependent on sleep amount but also on sleep architecture.
脑区之间的相互作用对大多数认知功能至关重要。这些区域之间的神经元相互作用依赖于突触强度的调节。然而,这种调节仍知之甚少。我们在自由活动的雄性大鼠中记录了24小时内四个海马通路的诱发反应。我们发现这些通路的突触强度以非常缓慢的周期振荡,并与警觉状态的持续时间相关。基于一个通路的睡眠图数据和突触强度建立的模型能够预测除一个通路外的大多数通路突触强度的变化。这些结果表明,警觉状态的时间序列可能通过在睡眠-觉醒周期中对多个通路的突触强度进行快速调节来促进记忆过程,这表明记忆过程不仅依赖于睡眠量,还依赖于睡眠结构。