EEG theta and frontal alpha oscillations during auditory processing change with aging

Electroencephalography and Clinical Neurophysiology/Evoked Potentials Section Pub Date : 1998-09-01 DOI:10.1016/S0168-5597(98)00028-8

Juliana Y Yordanova , Vasil N Kolev , Erol Başar

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引用次数: 62

Abstract

The present study assessed the effect of age on time and frequency components of auditory evoked potentials in two groups of adults, young (18–30 years old) and middle-aged (50–55 years old). Averaged and single-sweep potentials were analyzed. Analysis of single alpha and theta responses was performed for 3 parameters – single-sweep amplitude, phase-locking, and enhancement. Significant age differences were revealed only at the level of single sweeps: (i) at the 3 mid-line locations (Fz, Cz, and Pz), middle-aged adults manifested theta phase-locking and enhancement which were significantly stronger than those in young adults; and (ii) in contrast, only over the frontal brain area were the alpha responses stronger in phase-locking and enhancement in the middle-aged than in young subjects. Thus, the analysis of frequency responses at the level of single sweeps enabled us to reveal age differences in simple auditory stimulus processing that were otherwise not detectable in the averaged potential. The results imply that the alpha response system may relate to frontal brain functioning during aging.

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听觉加工过程中脑电图θ波和额叶α波随年龄变化而变化

本研究评估了年龄对青年(18-30岁)和中年(50-55岁)两组成年人听觉诱发电位时间和频率分量的影响。分析平均电位和单扫电位。对单次α和θ反应进行3个参数分析——单次扫描振幅、锁相和增强。(1)在Fz、Cz和Pz 3个中线位置，中年人的θ波锁相和增强明显强于年轻人;(2)相比之下，只有在额叶脑区，中年人的α反应在锁相和增强方面比年轻人强。因此，单次扫描水平的频率响应分析使我们能够揭示简单听觉刺激处理的年龄差异，否则在平均电位中无法检测到。结果表明，在衰老过程中，α反应系统可能与额叶脑功能有关。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Electroencephalography and Clinical Neurophysiology/Evoked Potentials Section

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