目的
大脑中不同频率的神经振荡能够将分散于各个脑区中的神经元活动联系起来。近年来,许多研究表明,神经振荡可以通过同等节律耦合和交叉节律耦合对同一脑区内或不同脑区之间的信息传递与交流发挥作用。这两种耦合方式与认知功能密切相关,并可能参与调节某些精神类疾病的发病。我们以前的研究表明血管性痴呆大鼠(vascular dementia, VD)空间学习记忆能力严重受损。在本研究中,进一步通过海马CA3和CA1局部场电位(local field potential, LFP)的theta和gamma节律,以及这两个节律之间交叉耦合分析进而探讨VD大鼠CA3与CA1脑区之间的协调能力的改变,从神经网路层面进一步探讨VD大鼠认知受损机制。并深入地讨论了基于LFP的神经信息流(Neural information flow,NIF)指标是否可以用来表征突触可塑性。
方法
采用双侧颈总动脉结扎方法建立Wistar大鼠血管性痴呆模型(vascular dementia, VD)。首先记录CA3和CA1的自发LFP,场电位记录完毕后,保持电极位置不动,诱导此神经通路的长时程增强(long term pote...
【英文摘要】
Objective
Various frequencies of neural oscillations could be benefit for integrations of distributed neurons activities. Recently, more and more studies were reported that neural oscillations could contribute to the information communication of multiple layers of brain regions through the same-rhythm coupling and/or cross-rhythm coupling. Both forms of interactions were demonstrated to be closely associated with the cognitive functions whose alterations were involved in mediating the cognitive deficits...