The Effect of Microphone Placement on Interaural Level Differences and Sound Localization Across the Horizontal Plane in Bilateral Cochlear Implant Users.

The effect of microphone placement on the interaural level differences available to bilateral cochlear implant users, and subsequent effects on horizontal-plane sound localization were investigated. Presently, microphones are most commonly placed behind the ear in adults, and sometimes on the shoulders in children. While efforts to position microphones in the ear exist, the impact of such placements on sound localization in bilateral cochlear implant users is not well understood. Sound localization was tested for these three microphone placements using virtual acoustic stimuli created from individual acoustic measurements made for each participant and placement. Acoustical analysis revealed a significant reduction in interaural level differences for behind the ear and shoulders placements compared with in the ear placement, which was correlated with a decrease in localization performance. Copyright (C) 2016 Wolters Kluwer Health, Inc. All rights reserved.

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