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首页> 外文期刊>The European Journal of Neuroscience >Stimulus-induced change in long-range temporal correlations and scaling behaviour of sensorimotor oscillations.
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Stimulus-induced change in long-range temporal correlations and scaling behaviour of sensorimotor oscillations.

机译：刺激引起的长期时间相关性变化和感觉运动振荡的定标行为。

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摘要

The human brain spontaneously generates large-scale network oscillations at around 10 and 20 Hz. The amplitude envelope of these oscillations fluctuates intermittently and was recently reported to exhibit power-law decay of the autocorrelation for hundreds of seconds. This indicates that the underlying networks are in a dynamic state resembling the self-organized critical state known to exist in many complex systems. Based on the mechanism of how correlations emerge in these systems, we hypothesized that the physiological basis of long-range power-law correlations is the buildup of a memory of past activity by a continuous modification of the network's functional connectivity by the ongoing oscillations. In this framework, exogenous perturbations of ongoing oscillations would degrade or abolish this dynamic network memory. We investigated the sensitivity of the temporal correlations in sensorimotor 10- and 20-Hz oscillations to median nerve stimulation that is known to have immediate effects on ongoingoscillations. Our results show that the amplitude fluctuations of these oscillations were effectively modulated by the somatosensory stimuli but still exhibited long-range temporal correlations and power-law scaling behaviour. The magnitude of the temporal correlations was, however, attenuated and the power-law exponents were decreased. This implies that the stimuli indeed degraded the network's memory of its past.
机译：人脑自发地产生大约10和20 Hz的大规模网络振荡。这些振荡的振幅包络线间歇性地波动，并且最近据报道在数百秒内表现出自相关的幂律衰减。这表明基础网络处于动态状态，类似于许多复杂系统中已知的自组织临界状态。基于这些系统中相关性如何出现的机制，我们假设远程幂律相关性的生理基础是通过持续振荡不断修改网络的功能连通性来建立对过去活动的记忆。在此框架中，正在进行的振荡的外来扰动将降低或取消此动态网络内存。我们调查了感觉运动10 Hz和20 Hz振荡中的时间相关性对正中神经刺激的敏感性，已知中位神经刺激会对正在进行的振荡产生直接影响。我们的结果表明，这些振动的幅度波动受到体感刺激的有效调制，但仍表现出长期的时间相关性和幂律定标行为。但是，时间相关性的幅度减弱了，幂律指数减小了。这意味着刺激确实降低了网络过去的记忆。

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