Abstract
Amplitudes of visually evoked cortical potentials, VECP, are so small that they are not detectable without some method to eliminate the noise from the measurement system, including spontaneous brain waves.
In the present study, the Kalman filtering technique combined with the averaging procedure has been tried to estimate the real value of VECP amplitudes in response to checkerboard pattern stimuli in sinusoidal counterphase modulation.
It was found that the necessary times of summation for measurable VECPs decreased markedly. The error of the variance in the noise had no effective influence on results.
Differing from the Wiener filtering, it showed that the calculation of power spectra was not necessary and, moreover, the gain matrix could be computed beforehand. These advantageous factors enabled the shortening of the computation time for the Kalman filtering.
