An analysis of the VEP to luminance modulation and of its nonlinearity.
An analysis of the VEP to luminance modulation and of its nonlinearity.
复制标题
亮度调制的 VEP 及其非线性分析。
DOI：
10.1016/0042-6989(92)90194-n
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发表时间：
1992
期刊：
影响因子：
1.8
通讯作者：
Srebro,R
中科院分区：
文献类型：
--
作者：
Srebro,R
使用相对长的伪随机二进制m序列刺激进行VEP亮度调制系统的识别。完整的一阶互相关函数提供了时域中的非线性的“指纹”。沃尔泰拉核切片到三阶被确认在完整的一阶互相关函数。它们都靠近主对角线。高阶核切片是不可测量的。级联块模型（三明治模型）分析表明，非线性是一个不对称的整流。亮度增加比亮度减少引起更强的响应。前置滤波器增益函数是低通的。后置滤波器增益函数在10 Hz附近进行带通调谐。相干谱被用来检查系统的信道结构。在8和15 Hz附近工作的两个通道很容易识别。另一个宽通道（或可能多个通道）存在于30 Hz以上。在许多受试者中，伪随机刺激允许在不到82秒的时间内进行完整的系统识别。
Identification of the VEP luminance modulation system was carried out using a relatively long pseudorandom binary m-sequence stimulus. The complete first order cross-correlation function provides a “fingerprint” of the nonlinearity in the time domain. Volterra kernel slices up to third order are recognized in the complete first order cross-correlation function. They all lie close to the major diagonal. Higher order kernel slices are not measurable. A cascade block model (sandwich model) analysis shows the nonlinearity to be an asymmetric rectification. Luminance increase causes a stronger response than does luminance decrease. The pre-filter gain function is low-pass. The post-filter gain function is band-pass tuned near 10 Hz. Coherency spectra are used to examine the channel structure of the system. Two channels operating near 8 and 15 Hz are easily identified. Another broad channel (or possibly multiple channels) is present above 30 Hz. In many subjects, the pseudorandom stimuli allow a complete system identification to be carried out in less than 82 sec.