University of Padova, Department of General Psychology, 35131 Padova, Italy.
Biol Psychol. 2010 Oct;85(2):258-67. doi: 10.1016/j.biopsycho.2010.07.011. Epub 2010 Jul 24.
This study aimed to clarify the functional role of several EEG bands across age by analyzing language hemispheric lateralization in three linguistic tasks. Twenty-eight children, 22 young adults and 20 middle-aged participants were administered the same sample of written words and normalized amplitudes of δ, ϑ, α and β bands were analyzed. Only young adults showed rightwards lateralization in δ frequency band. Task-dependent right-lateralization marked adults' ϑ and α distributions, whereas only linguistic vs. non-linguistic differences were found in children. Concerning the high-beta band, all groups showed left-lateralized linguistic effects. In adults slow rhythms represent indices of active inhibition of task-irrelevant regions, but in children they marked incomplete automated linguistic processing. The high-beta band revealed task-relevant left hemisphere linguistic activity in all groups, therefore representing the most reliable EEG marker of language hemispheric dominance in children and adults.
本研究旨在通过分析三种语言任务中的语言半球侧化，阐明几个 EEG 波段在不同年龄段的功能作用。我们对 28 名儿童、22 名青年人和 20 名中年人进行了相同的书面单词测试，并分析了 δ、θ、α 和 β 波段的归一化振幅。只有青年人在 δ 频段表现出右半球偏侧化。任务相关的右偏侧化标记了成年人的θ和α分布，而儿童则只表现出语言与非语言的差异。对于高β频段，所有组都表现出左半球语言效应的偏侧化。在成年人中，慢波节律代表对任务无关区域的主动抑制指数，但在儿童中，它们则标志着语言处理的不完整自动化。高β 频段在所有组中都显示出与任务相关的左半球语言活动，因此是儿童和成人语言半球优势的最可靠 EEG 标志物。
