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首页> 外文会议>Intelligent Information Technology Application, IITA, 2008 Second International Symposium on >Phase Synchronization Analysis of Theta-Band of Local Field Potentials in the Anterior Cingulated Cortex of Rats under Fear Conditioning
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Phase Synchronization Analysis of Theta-Band of Local Field Potentials in the Anterior Cingulated Cortex of Rats under Fear Conditioning

机译：恐惧条件下大鼠前扣带皮层局部场电位θ带的相位同步分析

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摘要

This study aims to examine the phase synchronization of characteristic frequency band of Local Field Potentials (LFPs) in anterior cingulated cortex (ACC) of rats under fear conditioning. The 16-channel LFPs were recorded in ACC of rats implicated in microelectrode array under fear conditioning. The rats were trained to freezing when they hear the conditioned tone. Theta-band synchronization of the neural signal in the hippocampus and in the lateral amygdale (LA) was found recently. So, Discrete Wavelet Transform was used to decompose LFPs to extract theta-band of LFPs. 16-channel's instantaneous phases of theta-band can be obtained through applying Hilbert Transform to the theta-band. Finally, cross-correlation coherences were calculated between every channel phase and a reference channel. The coherence values were calculated with a sliding window of 50ms and a step of 10ms. The results show that the linear correlation between every channel and a reference channel increased during retrieval of fear memory in the theta-band. These phenomena indicate that recall of fear memory can be discriminated from the rest state of brain using linear properties of electro-physiololgical signals. This analysis of fear memory may provide some support to the neuro-physiological mechanisms of fear memory.
机译：这项研究旨在检查恐惧条件下大鼠前扣带回皮质（ACC）的局部场电位（LFP）特征频带的相位同步。在恐惧条件下，在涉及微电极阵列的大鼠的ACC中记录了16通道LFP。当老鼠听到条件音时，他们被训练成冰冻。最近发现海马和外侧杏仁核（LA）中神经信号的θ带同步。因此，使用离散小波变换分解LFP，以提取LFP的θ带。通过将希尔伯特变换应用于theta频段，可以获得theta频段的16通道瞬时相位。最后，计算每个通道相位和参考通道之间的互相关相干性。相干值是用50ms的滑动窗口和10ms的步长计算的。结果表明，在θ带中恐惧记忆的检索过程中，每个通道与参考通道之间的线性相关性增加。这些现象表明，可以使用电生理信号的线性特性将恐惧记忆的回忆与大脑的静止状态区分开。对恐惧记忆的这种分析可能会为恐惧记忆的神经生理机制提供一些支持。

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