THE NEED for objective procedures to test auditory function in infants, children, and adults has long been recognized. The search for objective measures to augment and replace standard audiological methods requiring subjective responses has led to the development and use of electrodermal, electroencephalic (cortex-evoked response), electrocochleographic, and impedance audiometry.1-4 The electrodermal or galvanic skin response (GSR) audiometric technique has been generally abandoned because of the "... unspecificity of the stimulus and the resulting inaccuracy of the response"5 and the hazards of passing electrical currents through the body.1 Current techniques utilizing the other three methods provide either limited information or information that is often difficult to interpret.
Recently, new objective audiometric procedures have been introduced. One procedure is a slight modification of the electroencephalic or cortex-evoked response method. Instead of measuring the long-latency potentials (generally more than 50 msec after stimulus onset) recorded from cortical areas, measurements are taken
Don M, Kohut RI. New Advances in Objective Audiometry. JAMA. 1975;234(8):823. doi:10.1001/jama.1975.03260210031016