大鼠初级视皮层局部场电位γ振荡特性研究  

The Feature Selective Properties of the Gamma-oscillation of the Local Field Potentials in Rat's Primary Visual Cortex

作　　者：师黎[1] 黎晓亮[1] 王治忠[1] 

机构地区：[1]郑州大学电气工程学院,河南郑州450001

出　　处：《郑州大学学报（工学版）》2013年第3期1-5,共5页Journal of Zhengzhou University（Engineering Science）

基　　金：国家自然科学基金资助项目(60971110)

摘　　要：提出了确定γ频带范围的方法,并研究了不同拓扑结构图形刺激下γ振荡响应的特征选择特性.首先,采用小波变换和功率谱相结合的方法确定了大鼠初级视皮层局部场电位γ频带的准确范围;然后,计算了不同拓扑结构简单图形刺激下其发生γ振荡的潜伏期和γ频带的功率与不同刺激序列之间的互信息曲线,提取互信息曲线的平均值、最大值以及最大值处的频率等3个特征;最后,采用单因素方差分析对这些特征进行统计分析.结果表明,麻醉状态下大鼠初级视皮层局部场电位在视觉刺激下存在显著的γ振荡现象,γ振荡对简单图形刺激的拓扑特征具有显著的选择特性.In this paper, a method was presented to determine the band of gamma oscillation, and the charac- teristics of the gamma oscillation response to simple graphics with different topologies was explored. First, the method combining wavelets transform and power spectrum was adopted to determine the accurate gamma band range of the local field potentials in rat＇ s primary visual cortex. Secondly, the latency periods of gamma oscil- lation for simple graphics stimulus with different topologies were calculated and the curves of mutual informa- tion between the stimulus sequences and power spectrums in gamma band were estimated. The means, maxi- mum values and the frequencies at the maximum values of the curves were extracted as the feature parameters. Finally, these characteristics were analysed statistically with one-way analysis of variance. The experiment re- sults show that under visual stimulations the gamma-band oscillations exist obviously in the primary visual cor- tex （V1） of anesthetized rat. The gamma oscillations were significantly selective to the topological features of simple graphic stimulations.

关 键 词：初级视皮层 局部场电位 拓扑特征 互信息 γ振荡 

分 类 号：TN911.7[电子电信—通信与信息系统] R318.04[电子电信—信息与通信工程]