Interaural envelope correlation change discrimination in bilateral cochlear implantees: effects of mismatch, centering, and onset of deafness

The Journal of the Acoustical Society of America
Matthew J Goupell

Abstract

Bilateral cochlear implant (CI) listeners can perform binaural tasks, but they are typically worse than normal-hearing (NH) listeners. To understand why this difference occurs and the mechanisms involved in processing dynamic binaural differences, interaural envelope correlation change discrimination sensitivity was measured in real and simulated CI users. In experiment 1, 11 CI (eight late deafened, three early deafened) and eight NH listeners were tested in an envelope correlation change discrimination task. Just noticeable differences (JNDs) were best for a matched place-of-stimulation and increased for an increasing mismatch. In experiment 2, attempts at intracranially centering stimuli did not produce lower JNDs. In experiment 3, the percentage of correct identifications of antiphasic carrier pulse trains modulated by correlated envelopes was measured as a function of mismatch and pulse rate. Sensitivity decreased for increasing mismatch and increasing pulse rate. The experiments led to two conclusions. First, envelope correlation change discrimination necessitates place-of-stimulation matched inputs. However, it is unclear if previous experience with acoustic hearing is necessary for envelope correlation change discrimina...Continue Reading

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Citations

Aug 31, 2016·Network : Computation in Neural Systems·Mathias Dietz
Jan 10, 2019·Journal of the Association for Research in Otolaryngology : JARO·Matthew J GoupellJoshua G W Bernstein
Jan 24, 2018·Journal of Otolaryngology - Head & Neck Surgery = Le Journal D'oto-rhino-laryngologie Et De Chirurgie Cervico-faciale·John E IyaniwuraSumit K Agrawal
Jun 11, 2017·The Journal of the Acoustical Society of America·Katharina EggerBernhard Laback
Sep 2, 2019·The Journal of the Acoustical Society of America·Sean R AndersonRuth Y Litovsky
Dec 5, 2019·The Journal of the Acoustical Society of America·Sean R AndersonMatthew J Goupell
Dec 5, 2016·The Journal of the Acoustical Society of America·Matthew J GoupellRuth Y Litovsky
Aug 1, 2016·The Journal of the Acoustical Society of America·Ann E ToddRuth Y Litovsky
Jun 4, 2019·Hearing Research·Matthew J GoupellOlga Stakhovskaya

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