Molnár Márk, Csuhaj Roland, Horváth Szabolcs, Vastagh Ildikó, Gaál Zsófia Anna, Czigler Balázs, Bálint Andrea, Csikós Dóra, Nagy Zoltán
Department of Psychophysiology, Institute for Psychology, Hungarian Academy of Sciences, P.O. Box 398, H-1394 Budapest, Hungary.
Clin Neurophysiol. 2006 Apr;117(4):771-80. doi: 10.1016/j.clinph.2005.12.022. Epub 2006 Feb 21.
To compare spectral and complexity characteristics of the EEG in a unique case of subcortical infarct to those seen in healthy controls.
Absolute and relative frequency spectra, theta/beta ratio, the brain symmetry index (BSI), Omega-complexity and synchronization likelihood were calculated of the EEG recorded in eyes closed and eyes open conditions.
Increased absolute delta, theta, and Omega-complexity in these frequency bands, higher theta/beta ratios, and decreased relative beta activity were found in the side of the infarct. The BSI localized the excess of slow, and decrease of fast frequency activity to the area of ischemia. Following eyes opening the increase of fast and decrease of slow frequencies, the increase of Omega-complexity in the alpha and beta bands, and the decrease of synchronization likelihood for the fast frequency bands were reduced in the side of the infarct.
The subcortical infarct caused ipsilaterally increased slow, and decreased fast frequency activity accompanied by decreased synchronization of slow, increased synchronization of fast frequencies. Reduced reactivity in the ischemic side was particularly apparent for complexity measures.
Complexity indices of the EEG are sensitive complementary measures of electrophysiological changes caused by local lesions such as subcortical stroke.
在一例独特的皮质下梗死病例中，比较脑电图（EEG）的频谱和复杂性特征与健康对照者的脑电图特征。
计算在闭眼和睁眼条件下记录的脑电图的绝对和相对频谱、θ/β比值、脑对称指数（BSI）、欧米伽复杂性和同步可能性。
在梗死侧发现这些频段的绝对δ波、θ波和欧米伽复杂性增加，θ/β比值更高，相对β波活动减少。脑对称指数将缓慢频率活动的增加和快速频率活动的减少定位到缺血区域。睁眼后，梗死侧快速频率增加、缓慢频率减少、α和β频段欧米伽复杂性增加以及快速频段同步可能性降低的情况均减弱。
皮质下梗死导致同侧缓慢频率活动增加、快速频率活动减少，同时伴有缓慢频率同步性降低、快速频率同步性增加。缺血侧反应性降低在复杂性测量中尤为明显。
脑电图的复杂性指数是由局部病变如皮质下中风引起的电生理变化的敏感补充测量指标。
