CLAD刺激序列的噪声增益系数的性能评估  

Evaluation for Performance of CLAD Sequences by Noise Gain Factor

作　　者：马威锋[1] 王涛[1] 林霖[1] 

机构地区：[1]南方医科大学生物医学工程学院,广东广州510515

出　　处：《航天医学与医学工程》2015年第3期207-211,共5页Space Medicine & Medical Engineering

基　　金：国家自然科学基金(61172033;61271154)

摘　　要：目的研究在连续循环反卷积(continuous loop averaging deconvolution,CLAD)方法中,刺激序列噪声增益系数Cdec与暂态诱发电位的重建质量之间的对应关系。方法首先研究真实脑电中的噪声分布特性,然后比较了不同刺激序列及其对应的噪声增益系数在中潜伏期听觉诱发电位(auditory evoked potential,AEP)提取时的性能。结果由于真实脑电中噪声的频率分布具有1/f特性,而非白噪声,从而导致Cdec标定CLAD刺激序列的反卷积性能方面存在不足。结论 Cdec不能单独作为评估刺激序列优劣的充分条件,而应在使用时综合考虑噪声的频率分布性质。Objective To study the relationship between the noise gain factor termed Caecand performance of transient auditory （AEP） evoked potential restored with continuous loop averaging deconvolution （CLAD） paradigm. Methods Experiments were conducted to characterize the noise distribution of electroencephalogram （EEG） and to compare the characteristics of the stimulus sequences and the associated noise gain factors in the application of auditory evoked potentials on high stimulus rate experiments. Results Cdeo was limited in cal- ibrating the property of CLAD sequences while the noise of EEG exhibited 1/f rather white distribution. Con- clusion Cdec can not be sufficient to characterize the stimulus is also taken into consideration. sequences unless the noise frequency distribution

关 键 词：高刺激率诱发听觉电位 连续循环反卷积 噪声增益系数 

分 类 号：R318[医药卫生—生物医学工程]