Auditory processing indexed by stimulus-induced alpha desynchronization in children
Auditory processing indexed by stimulus-induced alpha desynchronization in children
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DOI：
10.1016/j.ijpsycho.2007.12.004
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发表时间：
2008-05-01
影响因子：
3
通讯作者：
Ross, Bernhard
中科院分区：
文献类型：
--
作者：
Fujioka, Takako;Ross, Bernhard
我们通过脑磁图（MEG）研究了12名4 ~ 6岁儿童在被动地听小提琴声和噪声刺激时听觉皮层活动的事件相关同步化和去同步化（ERS/ERD）。利用小波变换的时频分析方法，对从左右听觉皮层观察到的单次刺激源波形进行分析。刺激引起的非锁相活动的变化是明显的。在β范围（13-30 Hz）的ERS仅持续100 ms后，刺激开始。其次是突出的α ERD，这表明在两种刺激的左右听觉皮层的上（12 Hz）和下（8 Hz）α范围之间存在明显的分离。α ERD的时间过程（开始约300 ms，峰值在500 ins，偏移后1500 ms）与先前发现的年龄较大的儿童和成人的听觉记忆相关的任务。仅对于小提琴音调，ERD在上阿尔法带比下阿尔法带持续时间更长。研究结果表明，诱导α ERD指标听觉刺激处理的儿童没有特定的认知任务的要求。左侧听觉皮层表现出更大和更持久的上α ERD比右侧听觉皮层，可能反映了半球的差异，成熟阶段的神经振荡机制。(C)2008 Elsevier B. V.保留所有权利。
By means of magnetoencephalography (MEG), we investigated event-related synchronization and desynchronization (ERS/ERD) in auditory cortex activity, recorded from twelve children aged four to six years, while they passively listened to a violin tone and a noise-burst stimulus. Time-frequency analysis using Wavelet Transform was applied to single-trials of source waveforms observed from left and right auditory cortices. Stimulus-induced changes in non-phase-locked activities were evident. ERS in the beta range (13-30 Hz) lasted only for 100 ms after stimulus onset. This was followed by prominent alpha ERD, which showed a clear dissociation between the upper (12 Hz) and lower (8 Hz) alpha range in both left and right auditory cortices for both stimuli. The time courses of the alpha ERD (onset around 300 ms, peak at 500 ins, offset after 1500 ms) were similar to those previously found for older children and adults with auditory memory related tasks. For the violin tone only, the ERD lasted longer in the upper than the lower alpha band. The findings suggest that induced alpha ERD indexes auditory stimulus processing in children without specific cognitive task requirement. The left auditory cortex showed a larger and longer-lasting upper alpha ERD than did the right auditory cortex, likely reflecting hemispheric differences in maturational stages of neural oscillatory mechanisms. (C) 2008 Elsevier B.V. All rights reserved.