Ulrich G, Frick K
Percept Mot Skills. 1985 Dec;61(3 Pt 2):1323-34. doi: 10.2466/pms.1985.61.3f.1323.
Using the resting EEGs of 20 healthy subjects in semirecumbent position with eyes closed and left undisturbed, we studied the question whether and, if so, to what extent, lateralization of occipital alpha-rhythm depends on level of vigilance. As a simple indicator of vigilance, the relative alpha-power for each 2-sec. epoch of 02-CZ (occipital right) was calculated. Lateralization was defined as the ratio of absolute alpha-powers in 01-CZ and 02-CZ (occipital left and right). This was also calculated epoch by epoch. The results of individual analysis of data from each subject allowed categorization into 3 types. This typological differentiation obtained quantitatively could be supported by visual pattern analysis. The findings are discussed in relation to the state- vs trait-problem which constantly confronts us when we interpret experimentally obtained functional asymmetries of hemispheres.
我们使用20名健康受试者在半卧位闭眼且不受干扰时的静息脑电图，研究了枕叶α节律的偏侧化是否以及在多大程度上取决于警觉水平这一问题。作为警觉的一个简单指标，计算了每2秒时段在O2-CZ（右枕叶）处的相对α功率。偏侧化定义为O1-CZ和O2-CZ（左枕叶和右枕叶）处绝对α功率的比值，并且也是逐时段计算的。对每个受试者的个体数据分析结果可分为3种类型。通过视觉模式分析可以支持这种定量获得的类型学差异。结合在解释实验获得的半球功能不对称时我们经常面临的状态与特质问题，对这些发现进行了讨论。
