Registration of acoustically evoked vertex potentials with unconventional averaging technique

Abstract

The recording of acoustically evoked EEG potentials is normally considered to be dependent on an electronic average computer. The present paper describes a measuring set—up for such registrations without use of a conventional averaging technique. The repetitive signals are displayed on an oscilloscope with a camera attachment supplied with a special lens system. The image obtained by superposition of the individually displayed traces will under appropriate conditions disclose the true average of the received evoked potentials. Some examples are given to illustrate the clinical applicability of the method.