Analysis of event-related potentials (ERP) by damped sinusoids
Analysis of event-related potentials (ERP) by damped sinusoids
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DOI：
10.1007/s004220050452
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发表时间：
1998-06-01
影响因子：
1.9
通讯作者：
Gülçür, HO
中科院分区：
文献类型：
--
作者：
Demiralp, T;Ademoglu, A;Gülçür, HO
一些研究人员提出，事件相关电位(ERPs)可以由响应外部或内部事件的特定频段上的瞬时振荡叠加来解释。事件相关电位的暂态特性更适合于将其建模为衰减正弦波的总和。用幅值、阻尼系数、相位和频率四组参数可以完整地表征这些衰减的正弦信号。用Prony方法对这些参数进行估计。本研究应用该方法对10名健康受试者的长潜伏期听觉诱发电位(AEP)和听觉古怪反应(P300)进行了分析。结果表明，将少量的衰减正弦波相加即可重构出原始波形。这就允许对应急方案进行简明的表述。此外，该方法还表明，与AEP相比，奇怪的目标响应包含更高的幅度、更慢的增量和更慢的阻尼角成分。通过这项技术，我们证明了感觉和认知潜力的区别并不是在它们的总频率内容中固有的，而是在它们特定频段的频率成分中。
Several researchers propose that event-related potentials (ERPs) can be explained by a superposition of transient oscillations at certain frequency bands in response to external or internal events. The transient nature of the ERP is more suitable to be modelled as a sum of damped sinusoids. These damped sinusoids can be completely characterized by four sets of parameters, namely the amplitude, the damping coeffcient, the phase and the frequency. The Prony method is used to estimate these parameters. In this study, the long-latency auditory-evoked potentials (AEP) and the auditory oddball responses (P300) of 10 healthy subjects are analysed by this method. It is shown that the original waveforms can be reconstructed by summing a small number of damped sinusoids. This allows for a parsimonious representation of the ERPs. Furthermore, the method shows that the oddball target responses contain higher amplitude, slower delta and slower damped theta components than those of the AEPs. With this technique, we show that the differentiation of sensory and cognitive potentials are not inherent in their overall frequency content but in their frequency components at certain bands.