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首页> 外文期刊>International journal of psychophysiology: official journal of the International Organization of Psychophysiology >Visually evoked phase synchronization changes of alpha rhythm in migraine: Correlations with clinical features.
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Visually evoked phase synchronization changes of alpha rhythm in migraine: Correlations with clinical features.

机译：偏头痛的视觉诱发相位同步变化：与临床特征的关系。

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OBJECTIVE: This study aimed to compute phase synchronization of the alpha band from a multichannel electroencephalogram (EEG) recorded under repetitive flash stimulation from migraine patients without aura. This allowed examination of ongoing EEG activity during visual stimulation in the pain-free phase of migraine. METHODS: Flash stimuli at frequencies of 3, 6, 9, 12, 15, 18, 21, 24, and 27 Hz were delivered to 15 migraine patients without aura and 15 controls, with the EEG recorded from 18 scalp electrodes, referred to the linked earlobes. The EEG signals were filtered in the alpha (7.5-13 Hz) band. For all stimulus frequencies that we evaluated, the phase synchronization index was based on the Hilbert transformation. RESULTS: Phase synchronization separated the patients and controls for the 9, 24 and 27 Hz stimulus frequencies; hyper phase synchronization was observed in patients, whereas healthy subjects were characterized by a reduced phase synchronization. These differences were found in all regions of the scalp. CONCLUSIONS: During migraine, the brain synchronizes to the idling rhythm of the visual areas under certain photic stimulations; in normal subjects however, brain regions involved in the processing of sensory information demonstrate desynchronized activity. Hypersynchronization of the alpha rhythm may suggest a state of cortical hypoexcitability during the interictal phase of migraine. SIGNIFICANCE: The employment of non-linear EEG analysis may identify subtle functional changes in the migraine brain.
机译：目的：本研究旨在从无先兆偏头痛患者反复闪光刺激下记录的多通道脑电图（EEG）中计算α波段的相位同步。这样可以检查偏头痛无痛期视觉刺激期间正在进行的脑电活动。方法：将频率分别为3、6、9、12、15、18、21、24和27 Hz的闪光刺激传递给15名无先兆的偏头痛患者和15名对照，并从18个头皮电极记录脑电图。相连的耳垂。脑电信号在阿尔法（7.5-13 Hz）频带中滤波。对于我们评估的所有激励频率，相位同步指数均基于希尔伯特变换。结果：相位同步将患者和对照组分离为9、24和27 Hz刺激频率。在患者中观察到超同步，而健康受试者的特征是同步减少。这些差异在头皮的所有区域均可见。结论：在偏头痛过程中，在某些光刺激下，大脑会与视觉区域的空转节奏保持同步。然而，在正常受试者中，参与感觉信息处理的大脑区域显示出失同步的活动。阿尔法心律的过度同步可能表明在偏头痛发作期皮质低兴奋性状态。意义：进行非线性脑电图分析可能会发现偏头痛大脑中细微的功能变化。

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