Inter- and intra-individual variability in alpha peak frequency.
Inter- and intra-individual variability in alpha peak frequency.
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α 峰值频率的个体间和个体内变异性。
DOI：
10.1016/j.neuroimage.2014.01.049
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发表时间：
2014-05-15
期刊：
影响因子：
5.7
通讯作者：
Nobre AC
中科院分区：
文献类型：
--
作者：
Haegens S;Cousijn H;Wallis G;Harrison PJ;Nobre AC
汇集的电生理证据表明，α节律在认知过程中起着重要而积极的作用。在这里，我们系统地研究了受试者之间和受试者内部后α峰频率的变异性。我们在三种实验条件下使用MEG记录了51名健康人类受试者的大脑活动-休息，被动视觉刺激和N-back工作记忆范式，使用源重建方法将α活动与顶叶和枕叶源分离。我们询问了在不同认知条件和感兴趣区域的受试者中α峰频率的差异，并研究了受试者之间α峰频率的分布。在这两个区域中，我们观察到从静息状态和被动视觉刺激条件到N-back范式的α峰频率增加，与0-back条件相比，2-back中的α峰频率显著更高。在N-back任务中，枕叶皮层与顶叶皮层的α峰频率有更大的增加趋势。所有受试者、条件和感兴趣区域的平均α峰频率为10.3 Hz，受试者内SD为0.9 Hz，受试者间SD为2.8 Hz。我们还测量了β峰频率，除了在休息时的顶叶皮层，没有发现任何迹象表明与α峰频率有严格的谐波关系。我们的结论是，随着认知需求的增加，后部区域的α峰频率增加，α节律的频率范围比许多研究倾向于包括在他们的分析中的8-12 Hz频带更宽。因此，使用固定且有限的α频带可能会使结果与某些受试者和条件产生偏差。α峰频率随着认知需求而增加。α和β之间没有严格的调和关系。对某些受试者/条件使用有限和固定的alpha偏差带。
Converging electrophysiological evidence suggests that the alpha rhythm plays an important and active role in cognitive processing. Here, we systematically studied variability in posterior alpha peak frequency both between and within subjects. We recorded brain activity using MEG in 51 healthy human subjects under three experimental conditions — rest, passive visual stimulation and an N-back working memory paradigm, using source reconstruction methods to separate alpha activity from parietal and occipital sources. We asked how alpha peak frequency differed within subjects across cognitive conditions and regions of interest, and looked at the distribution of alpha peak frequency between subjects. In both regions we observed an increase of alpha peak frequency from resting state and passive visual stimulation conditions to the N-back paradigm, with a significantly higher alpha peak frequency in the 2-back compared to the 0-back condition. There was a trend for a greater increase in alpha peak frequency during the N-back task in the occipital vs. parietal cortex. The average alpha peak frequency across all subjects, conditions, and regions of interest was 10.3 Hz with a within-subject SD of 0.9 Hz and a between-subject SD of 2.8 Hz. We also measured beta peak frequencies, and except in the parietal cortex during rest, found no indication of a strictly harmonic relationship with alpha peak frequencies. We conclude that alpha peak frequency in posterior regions increases with increasing cognitive demands, and that the alpha rhythm operates across a wider frequency range than the 8–12 Hz band many studies tend to include in their analysis. Thus, using a fixed and limited alpha frequency band might bias results against certain subjects and conditions. Alpha peak frequency increases with cognitive demand. No strict harmonic relationship between alpha and beta. Using a limited and fixed band for alpha biases against certain subjects/conditions.
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影响因子：
5.3
作者：
Haegens, Saskia;Haendel, Barbara F.;Jensen, Ole
通讯作者：
Jensen, Ole
影响因子：
3
作者：
Klimesch, W
通讯作者：
Klimesch, W
影响因子：
19.9
作者：
Klimesch, Wolfgang
通讯作者：
Klimesch, Wolfgang
影响因子：
--
作者：
Berger, H
通讯作者：
Berger, H
DOI：
10.1523/jneurosci.2969-10.2010
发表时间：
2010-10-13
期刊：
The Journal of neuroscience : the official journal of the Society for Neuroscience
影响因子：
--
作者：
Jones SR;Kerr CE;Wan Q;Pritchett DL;Hämäläinen M;Moore CI
通讯作者：
Moore CI