Application of Paired-Comparison Methods to Hearing Aids

Abstract

The method of paired comparisons was introduced into the hearing aid literature nearly 50 years ago. Over time, studies have found paired comparisons to be sensitive, valid, and reliable in determining either the perceptual difference or relative ranking among hearing aids and electroacoustic characteristics. With the increasing number of adjustable electroacoustic parameters in today’s digital hearing aids—and the lack of procedural guidelines necessary to fit many of them—the method of paired comparisons provides the clinician with the ability to compare different devices, electroacoustic characteristics, memory settings, or combinations of these variables under the listener’s everyday listening conditions. Furthermore, this procedure provides the clinician with the ability to individualize the prescriptive approach—which is predicated mainly on hearing threshold data and listening in quiet—so that a combination of parameters can be set to optimize the user’s listening needs in a given environment. In this article, the authors present an overview of the theoretical principle supporting this procedure, the various paired-comparison strategies and associated approaches, the advantages of this method, and recommended procedures for implementing the method of paired comparisons in the fitting of today’s sophisticated hearing aids.