Regan D
Electroencephalogr Clin Neurophysiol. 1976 Jun;40(6):654-60. doi: 10.1016/0013-4694(76)90140-1.
This note describes a method for rapidly measuring the latency of a steady-state visual evoked potential (EP). Three sinewaves of different frequencies (F1, F2 and F3 c/sec) are summed, and the resulting waveform modulates either light intensity (for flicker stimulation) or spatial contrast (for pattern stimulation). Three evoked potentials of frequencies F1, F2 and F3 c/sec respectively are stimultaneously recorded by running three Fourier analysers in parallel. The outputs of the three analysers are presented in a single polar plot so as directly to display the three values of EP amplitude and phase. Practical methods for generating the pattern and flicker stimuli are described.
本笔记描述了一种快速测量稳态视觉诱发电位（EP）潜伏期的方法。将三个不同频率（F1、F2和F3赫兹）的正弦波相加，所得波形调制光强度（用于闪烁刺激）或空间对比度（用于图形刺激）。通过并行运行三个傅里叶分析仪，同时记录分别为F1、F2和F3赫兹的三个诱发电位。三个分析仪的输出显示在一个单极图中，以便直接显示EP幅度和相位的三个值。文中描述了生成图形和闪烁刺激的实用方法。
