むだ時間を含む二次要素による閃光誘発電位モデル

抄録

Evoked potentials in response to flash stimulation or photic evoked potential (PEP), as recorded from occipital scalp electrodes, consist of several negative-positive peaks starting approximately 40 msec following stimulus onset. The present study is aimed at quantitatively expressing the features of the PEP.
In this paper we propose the evoked potential model which consists of a parallel combination of the second-order systems with time lags. The model parameters are obtained optimally in the frequency domain by the Fletcher-Powell method of optimization. By using the evoked potential model, the PEPs of several subjects are analysed, and the PEP waveforms can be decomposed respectively into several basic waveforms. The superposition of the basic waveforms by the model thus determined shows a good approximation of the PEP waveform, and the characteristic parameters of the PEP can be calculated by using the model parameters.