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首页> 外文期刊>Journal of Behavioral and Brain Science >Slow Gamma Activity of Local Field Potentials (LFP) in the Freely Moving Rat Relates to Movement
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Slow Gamma Activity of Local Field Potentials (LFP) in the Freely Moving Rat Relates to Movement

机译：自由移动大鼠的局部场电位（LFP）的慢伽马活动与运动有关。

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Quantitative assessment of local field potentials by means of Fast Fourier Transformation (FFT) results in the so-called power density spectrum. Within this spectrum particular frequency ranges are defined in order to relate these to behavior. Frequencies above 35 Hz are generally labeled as gamma oscillations, especially as low gamma (40 - 55 Hz) or high gamma (70 - 100 Hz). In order to learn more about this feature, we implanted a set of 4 bipolar concentric steel electrodes in frontal cortex, hippocampus, striatum and midbrain reticular formation of 10 rats. After recovery, field potentials were recorded and wirelessly transmitted to our computer for frequency analysis. At the same time, motion was registered during the whole experimental period of 5.75 hours. Results revealed that low gamma activity only emerged when the animal moved—at least his head. FFT of the data showed—besides other frequencies—a slow gamma activity peaking around 47 Hz pre-dominantly within the striatum, less in frontal cortex and reticular formation and nearly none in the hippocampus. Spectral analysis was performed for single epochs of 4 seconds and all 15 minutes intervals. Correlation analysis of these intervals was done to motion data. All rats showed a highly significant correlation between gamma activity and movement. We therefore conclude from these experiments that this slow gamma activity of the field potentials is not only related to movement, but possibly part of the general neuronal coding of movement.
机译：通过快速傅立叶变换（FFT）对局部场电势进行定量评估，得出了所谓的功率密度谱。在该频谱内定义了特定的频率范围，以便将其与行为相关联。高于35 Hz的频率通常被标记为伽马振荡，尤其是低伽马（40-55 Hz）或高伽马（70-100 Hz）。为了更多地了解此功能，我们在10只大鼠的额叶皮质，海马，纹状体和中脑网状结构中植入了一组4个双极同心钢电极。恢复后，将现场电位记录下来并无线传输到我们的计算机进行频率分析。同时，在整个5.75小时的实验时间内记录了运动。结果表明，只有当动物移动时（至少是他的头部），伽马活性才会降低。数据的FFT显示-除其他频率外-慢的伽马射线活动主要在纹状体内以47 Hz左右达到峰值，额叶皮层和网状结构较少，海马几乎没有。对4秒钟的单周期和所有15分钟的间隔进行光谱分析。对运动数据进行了这些间隔的相关分析。所有大鼠均显示出伽马活性和运动之间的高度显着相关性。因此，我们从这些实验中得出结论，这种场电位的慢伽马活动不仅与运动有关，而且可能与运动的一般神经元编码有关。

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