Instrumentation for acoustically evoked potentials using a photographic averaging technique

Abstract

The measuring method incorporates a photographic device to obtain an average recording of the vertex potentials. The patient is stimulated with pure tones just as in conventional audiometry; the repetition rate k one stimulus per 10 seconds. The vertex potentials tie recorded from skin electrodes connected to a differential amplifier and displayed on an oscilloscope. The superimposed traces of repetitive responses are transferred to a polaroid film via a special optical system, and the recording thus obtained reveals the average of the evoked potentials.