Functional Role of "Noise" in Physiological Control Systems

我们研究了生理信号的类噪声成分的功能方面。首先，我们表明，外部增加的噪音，大脑斯特恩，压力反射中心敏化他们的反应，保持足够的血液prelusion到大脑本身。我们还表明，在某些神经系统疾病中，噪声的加入确实有助于补偿压力反射中心的功能障碍。接下来，我们研究了已知在某种心脏病中丢失的多重分形心率波动的生理起源。结果表明，心率的分形波动反映了神经自主调节过程的内在性质。最后，我们探讨了身体运动时间序列的分形相关性与可能的精神和/或心身疾病之间的关系。结果表明，慢性疲劳综合征患者的分形相关性消失。

We investigated functional aspects of noise-like components of physiological signals. First, we showed that externally-added noise to the brain stern, baroreflex centers sensitized their responses in maintaining adequate blood prelusion to the brain it self. We also showed that the addition of noise was indeed useful in compensating for dysfunctions of the baroreflex centers hi certain neurological diseases. Next, we examined physiological origins of multifractal heart rate fluctuation known to be lost in a certain cardiac disease. It was shown that the rnultifractal heart rate fluctuation reflected an intrinsic, property of neuroautonomic regulatory processes. Finally, we investigated the relationship between fractal correlation of body movement time series and possible psychiatric and/or psychosomatic diseases. It was shown that the fractal correlation was lost in patients with chronic fatigue syndrome.