Abstract
Characteristics of the Wiener filter technique proposed by D.O Walter are investigated with the aid of a simple numerical simulation. The discussion is focussed upon the difference between the Wiener filtering and the conventional averaging and upon the applicability of these methods to estimations of average evoked potentials. It is explained that, in contrast to the conventional averaging, the Wiener filtering can effectively remove periodic components of the noise; even when their amplitudes are large if their frequency components are in random phases among samples. Furthermore, it is pointed out that, in order to obtain qualitative l y reasonable average evoked potentials for a single stimulus, aperiodic presentation of stimuli is effective in reducing possible interferences with background activities, such as the prominent alpha. Finally, several remarks on evoked potential measurements are presented.
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