AN AMPLIFIER, RECORDING SYSTEM, AND STIMULATING DEVICES FOR THE STUDY OF CEREBRAL ACTION CURRENTS

Abstract

A resistance coupled amplifier is described which has a noise level of about one micro-volt, a time constant of over 1/2 sec. and sufficient amplification to operate a cathode ray oscillograph and a loud speaker. Other calibrating, stimulating, and accessory circuits here described have been devised with special reference to the study of the auditory pathways of the central nervous system.