Skull thickness and magnitude of EEG alpha activity
Skull thickness and magnitude of EEG alpha activity
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DOI：
10.1016/j.clinph.2008.02.010
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发表时间：
2008-06-01
影响因子：
4.7
通讯作者：
Naumann, Ewald
中科院分区：
文献类型：
--
作者：
Hagemann, Dirk;Hewig, Johannes;Naumann, Ewald
目的：脑电图（EEG）研究个性或智力的个体差异的生理基础上，通常假设，受试者之间的脑电图α活动的差异反映了大脑功能的个体差异。然而，非功能性的方差源，如颅骨厚度的个体差异，可能会显着贡献的EEG振幅的幅度的个体差异。本研究的目的是评估头骨厚度和EEG α activity.Methods的幅度之间的关联：一个58通道EEG记录从49名受试者在静息状态下，在三个场合的测量，每隔5周。颅骨厚度的评估与质子加权图像的头部，获得了一个1.5 T磁共振成像（MRI）scanner.Results：只有一个平庸的相关性之间的EEG α功率在额，颞，顶叶和厚度的底层颅骨，与r =-0.36和r = 10。结论：这一发现表明，颅内源贡献更多的变化比在颅骨thickness.Significance：颅骨厚度的变化表面EEG可能被忽略作为一个潜在的错误来源时，脑活动的个体差异是由EEG α活动的幅度索引。(c)2008年国际临床神经生理学联合会。由Elsevier爱尔兰有限公司出版。保留所有权利。
Objective: Electroencephalographic (EEG) research on the physiological basis of individual differences in personality or intelligence commonly presumes that between-subjects differences of EEG alpha activity reflect individual differences in brain functions. However, nonfunctional sources of variance such as individual differences in skull thickness may significantly contribute to individual differences in the magnitude of EEG amplitudes. Aim of the present study was to assess the association between skull thickness and the magnitude of EEG alpha activity.Methods: A 58-channel EEG was recorded from 49 subjects in resting states at three occasions of measurement each 5 weeks apart. Skull thickness was assessed with proton-weighted images of the head that were acquired with a 1.5 T magnetic resonance imaging (MRI) scanner.Results: There was only a mediocre association between EEG alpha power at frontal, temporal, and parietal sites and the thickness of the underlying skull, with correlations ranging between r = -.36 and r = 10.Conclusions: This finding suggests that intracranial sources contribute much more variance to the surface EEG than do variations in skull thickness.Significance: Skull thickness may be neglected as a potent source of error when individual differences in brain activity are indexed by the magnitude of EEG alpha activity. (c) 2008 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.