Tail-clamping stimulation increases phase-locking neurons in the hippocampus of anaesthetized rat

Y. Wang, X. J. Zheng, Z. Feng
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Abstract

Phase-locking is an important encoding mode in the hippocampal region of brain where neuronal firing concentrates on a certain phase of the periodic field potential, especially θ rhythm. It can be observed during many behaviors while the locked-phase varies accordingly. In this study, the changes of neuronal phase-locking induced by somatosensory stimulation of tail-clamping were investigated. The local field potential and spike signals were recorded in hippocampal CA1 region of anesthetized rats with microelectrode array. The phase-locking relationship was analyzed with Raleigh test and spike-phase histogram. The results showed that during spontaneous activity, 3 of 20 examined neurons were phase-locking to the θ rhythm of the field potential. However, during the tail clamping periods, the number of phase-locking neurons increased from 3 to 8, and the mean locked-phase shifted towards the negative peak of the field potential cycle, which became θ rhythm dominated. These findings suggest that the hippocampus may encode somatosensory information with the phase-locking neurons and by shifting their locked-phases.
夹尾刺激使麻醉大鼠海马锁相神经元增多
锁相是大脑海马区的一种重要编码方式,神经元的放电集中在周期场电位的某一相位,尤其是θ节律。当锁相发生相应变化时,可以在许多行为中观察到它。本研究研究了夹尾体感觉刺激对神经元锁相的影响。用微电极阵列记录麻醉大鼠海马CA1区局部场电位和尖峰信号。用罗利检验和峰相直方图分析锁相关系。结果表明,在自发性活动中,20个神经元中有3个与场电位的θ节律相锁。锁相神经元数量从3个增加到8个,平均锁相向场电位周期负峰移动,以θ节律为主。这些发现表明,海马体可能通过锁相神经元编码体感觉信息,并通过改变它们的锁相。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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