A NEW STATISTIC FOR STEADY-STATE EVOKED-POTENTIALS
A NEW STATISTIC FOR STEADY-STATE EVOKED-POTENTIALS
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DOI：
10.1016/0013-4694(91)90099-p
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发表时间：
1991-05-01
期刊：
影响因子：
--
通讯作者：
MAST, J
中科院分区：
文献类型：
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作者：
VICTOR, JD;MAST, J
稳态诱发电位通常以一个或多个感兴趣频率的傅里叶分量的幅值和相位来表征。我们引入一个新的统计量来评估这些傅里叶分量。这个统计量，表示为T(circ)2，是基于相同的生理学假设，关于傅立叶分量的可变性来源，这些假设是在使用瑞利相相干统计量和标准T2统计量（Hotelling 1931）的多变量数据中做出的。然而，T(circ)2统计量也利用了傅里叶估计的实分量和虚分量之间的关系，T2没有利用这一点，并利用了被瑞利准则忽略的幅度信息。由于这些原因，无论在原理上还是在实践中，T(circ)2统计量都比以前使用的检测和定量稳态响应的标准更有效。
Steady-state evoked potentials are often characterized by the amplitude and phase of the Fourier component at one or more frequencies of interest. We introduce a new statistic for the evaluation of these Fourier components. This statistic, denoted T(circ)2, is based on the same physiologic assumptions concerning the sources of variability of a Fourier component that are made in the use of the Rayleigh phase-coherence statistic as well as the standard T2 statistic (Hotelling 1931) for multivariate data. However the T(circ)2 statistic also exploits the relationship between the real and imaginary components of Fourier estimates, which is not exploited by T2, and utilizes amplitude information, which is ignored by the Rayleigh criterion. For these reasons, the T(circ)2 statistic is more efficient than previously used criteria for detection and quantitation of steady-state responses, both in principle and in practice.