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Beyond frontal alpha: investigating hemispheric asymmetries over the EEG frequency spectrum as a function of sex and handedness.
Laterality ( IF 2.167 ) Pub Date : 2018-11-02 , DOI: 10.1080/1357650x.2018.1543314
Sebastian Ocklenburg 1 , Patrick Friedrich 1 , Judith Schmitz 1 , Caroline Schlüter 1 , Erhan Genc 1 , Onur Güntürkün 1 , Jutta Peterburs 2 , Gina Grimshaw 3
Affiliation  

Frontal alpha EEG asymmetry, an indirect marker of asymmetries in relative frontal brain activity, are widely used in research on lateralization of emotional processing. While most authors focus on frontal electrode pairs (e.g., F3/F4 or F7/F8), several recent studies have indicated that EEG asymmetries can also be observed outside the frontal lobe and in frequency bands other than alpha. Because the focus of most EEG asymmetry research is on the correlations between asymmetry and other traits, much less is known about the distribution of patterns of asymmetry at the population level. To systematically assess these asymmetries in a representative sample, we determined EEG asymmetries across the head in the alpha, beta, delta and theta frequency bands in 235 healthy adults. We found significant asymmetries in all four frequency bands and across several brain areas, indicating that EEG asymmetries are not limited to frontal alpha. Asymmetries were not modulated by sex. They were modulated by direction of hand preference, with stronger right-handedness predicting greater right (relative to left) alpha power, or greater left (relative to right) activity. Taken together, the present results show that EEG asymmetries other than frontal alpha represent markers of asymmetric brain function that should be explored further.



中文翻译:

超越额叶阿尔法:研究脑电图频谱上的半球不对称性与性别和惯性有关。

额叶脑电图不对称性是相对额叶大脑活动不对称性的间接标志,被广泛用于情绪加工的侧向化研究。尽管大多数作者关注额叶电极对(例如F3 / F4或F7 / F8),但最近的一些研究表明,也可以在额叶外部以及除α之外的其他频带中观察到EEG不对称。由于大多数EEG不对称性研究的重点是不对称性与其他特征之间的相关性,因此关于不对称性模式在人群水平上的分布知之甚少。为了系统地评估代表性样本中的这些不对称性,我们确定了235名健康成年人的α,β,δ和theta频带中整个头部的EEG不对称性。我们发现在所有四个频段和多个大脑区域都有明显的不对称性,这表明脑电图不对称性不仅限于额叶。不对称性不受性别影响。它们是通过手的偏爱方向进行调节的,更强的右手性预示着更大的右(相对于左)alpha力量,或更大的左(相对于右)活动。两者合计,目前的结果表明,额叶以外的脑电图不对称性代表不对称脑功能的标记,应进一步探讨。

更新日期:2018-11-02
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