首页> 外文期刊>Network >On phasic inhibition during hippocampal theta
【24h】

On phasic inhibition during hippocampal theta

机译:关于海马θ期间的相抑制

获取原文
获取原文并翻译 | 示例
           

摘要

Two computational models are used to explore the possible implications of recent experimental data (Royer et al. 2012) on phasic inhibition during theta frequency (4-10 Hz) oscillations in the hippocampi of actively behaving rodents. A working hypothesis from previous experimental and modelling studies is that a theta cycle is divided into encoding (when synaptic plasticity is enhanced) and recall (when plasticity is suppressed) half cycles. Using a compartmental model of a CA1 pyramidal cell, including dendritic spines, we demonstrate that out-of-phase perisomatic and dendritic inhibition, respectively, can promote the necessary conditions for these half cycles. Perisomatic inhibition allows dendritic calcium spikes that promote synaptic LTP, while minimising cell output. Dendritic inhibition, on the other hand, both controls cell output and suppresses dendritic calcium spikes, preventing LTP. The exact phase relationship between these sub-cycles may not be fixed. Using a simple sum-of-sinusoids activity model, we suggest an interpretation of the data of Royer et al. (2012) in which a fixed-phase encoding sub-cycle is surrounded by a flexible-phase recall cycle that follows the peak of excitatory drive and consequent phase precession of activity as an animal passes through a pyramidal cell's place field.
机译:使用两个计算模型来探索最新实验数据(Royer等人,2012)对活跃表现为啮齿动物的海马体在θ频率(4-10 Hz)振荡过程中的相位抑制的可能影响。先前实验和模型研究的一个可行假设是,θ周期分为编码(增强突触可塑性)和回想(抑制塑性)半个周期。使用包括树突棘在内的CA1锥体细胞的隔室模型,我们证明了异相的过同位素抑制和树突抑制分别可以促进这些半周期的必要条件。渗透抑制作用使树突状钙突增促进突触LTP,同时使细胞输出减至最少。另一方面,树突抑制作用既控制细胞产量,又抑制树突钙尖峰,从而防止LTP。这些子循环之间的确切相位关系可能不确定。使用一个简单的正弦和活动模型,我们建议对Royer等人的数据进行解释。 (2012年),其中一个固定阶段编码子周期被一个灵活阶段召回周期所围绕,该阶段跟随着兴奋性驱动的高峰,随之而来的是动物穿过锥体细胞的位置场时活动的阶段进动。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号