Magnetoencephalographic cortical rhythms
Magnetoencephalographic cortical rhythms
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DOI：
10.1016/s0167-8760(97)00755-1
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发表时间：
1997-06-01
影响因子：
3
通讯作者：
Helle, M
中科院分区：
文献类型：
--
作者：
Hari, R;Salmelin, R;Helle, M
我们的特点是磁10-和20-Hz的节奏记录与全头皮神经磁力计在不同的条件下。后10赫兹（α）节律的来源主要集中在顶枕沟周围，在较小程度上，围绕距状沟，有几个发电机。时间谱演化（TSE）分析，用于以下事件相关的变化，在不同的频带，表现出强烈的阻尼的α在200毫秒内出现的视觉刺激后，也在视觉图像。抑制之后往往会反弹到基线水平之上。罗兰亩节奏由10和20赫兹的组件与不同的反应性和源位置。10 Hz的成分似乎主要是躯体感觉的起源，而20 Hz的信号也收到来自运动皮层的贡献，甚至显示出“motorotopy”在其反应性：源位置取决于在一个躯体位置的方式上的网站上的移动身体的一部分。内侧丘脑小梗死患者的后部自发活动的频率组成受到干扰。它示出了与模拟，一个令人惊讶的少量同步皮层神经元可以产生所记录的振荡信号的主要部分。最后，对脑节律的术语提出了一些澄清。(C)1997年Elsevier Science B.V.
We have characterized the magnetic 10- and 20-Hz rhythms recorded with a whole-scalp neuromagnetometer during different conditions. Sources of the posterior 10-Hz (alpha) rhythm clustered mainly around the parieto-occipital sulcus and, to a lesser extent, around the calcarine sulci, with several generators. Temporal Spectral Evolution (TSE) analysis, used to follow event-related changes in the different frequency bands, showed strong dampening of the alpha within 200 ms after the appearance of a visual stimulus and also during visual imagery. Suppression was often followed by a rebound above the baseline level. The rolandic mu rhythm consisted of 10- and 20-Hz components with different reactivity and source locations. The 10-Hz component seems to be mainly somatosensory in origin whereas the 20-Hz signal also receives contributions from the motor cortex, and even shows 'motorotopy' in its reactivity: the source locations depend in a somatotopical manner on the site of the moving body part. The frequency composition of the posterior spontaneous activity was disturbed in patients with small infarcts of the medial thalamus. It is shown with simulations that a surprisingly small number of synchronized cortical neurons could generate the major part of the recorded oscillatory signal. Finally, some clarifications are suggested to the terminology of brain rhythms. (C) 1997 Elsevier Science B.V.