Auditory Localization Abilities in Bilateral Cochlear Implant Recipients

Verschuur, Carl; Lutman, Mark E.; Ramsden, R. T.; Greenham, Paula; O’Driscoll, Martin

doi:10.1097/01.mao.0000185073.81070.07

Cited by 122 publications

(107 citation statements)

References 11 publications

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“…For example, performance on a horizontal localization task was on average 2° in normal-hearing participants and 10° in HA users [94]. Under similar test conditions, 20 participants with bilateral implants had errors of 24° but a significant improvement over the unilateral condition of 67° (chance = 65°).…”

Section: Localizationmentioning

confidence: 88%

“…For CI recipients using a dual microphone at each ear coupled to a single CI system, speech-recognition performance has been shown to be poorer than with bilateral implants [74,94,100]. Bilateral microphones with a single implant, therefore, do not achieve the binaural processing capabilities that may be afforded by bilateral implants.…”

Section: Fitting Of Bilateral Implantsmentioning

confidence: 99%

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Restoring hearing symmetry with two cochlear implants or one cochlear implant and a contralateral hearing aid

Firszt

Reeder²,

Skinner³

2008

JRRD

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Abstract-With today's technology and the demonstrated success of cochlear implantation, along with expanded candidacy criteria, the opportunity to provide optimal hearing to both ears for individuals with severe-to-profound hearing loss is greater than ever. This article reviews the advantages of binaural hearing and the disadvantages of hearing with only one ear or hearing with two ears with significantly different sound thresholds. A case study is presented that demonstrates the benefit of bimodal hearing (i.e., a cochlear implant [CI] in one ear and a contralateral hearing aid [HA]) in a nontraditional CI candidate with asymmetrical hearing thresholds. Then, selected studies in adult recipients who use a CI and contralateral HA or who use two CIs are summarized. The data overall demonstrate that bilateral CI recipients, traditional bimodal recipients, and nontraditional bimodal recipients experience substantial binaural hearing advantages, including improved speech recognition in noise, localization, and functional everyday communication. These results indicate that bilateral stimulation of the auditory system through a CI and contralateral HA or two CIs is beneficial and should become standard clinical practice.

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Section: Localizationmentioning

confidence: 88%

Section: Fitting Of Bilateral Implantsmentioning

confidence: 99%

Restoring hearing symmetry with two cochlear implants or one cochlear implant and a contralateral hearing aid

Firszt

Reeder²,

Skinner³

2008

JRRD

View full text Add to dashboard Cite

show abstract

“…In particular, bilateral stimulation can provide a substantial benefit for recognizing speech presented in competition with spatially distinct noise compared with scores obtained with either unilateral implant alone [63,[111][112][113][114][115][116][117][118][119][120][121][122][123][124][125][126][127]. In addition, use of both implants supports an improved ability to lateralize or localize sounds (depending on which was measured in a particular study), again compared with either unilateral implant [113,[116][117][119][120][124][125][127][128][129][130][131][132][133]. (This ability is nonexistent or almost nil with a unilateral implant.)…”

Section: Recent Advancesmentioning

confidence: 99%

Cochlear implants: Current designs and future possibilities

Wilson¹

2008

JRRD

317

188

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Abstract-The cochlear implant is the most successful of all neural prostheses developed to date. It is the most effective prosthesis in terms of restoration of function, and the people who have received a cochlear implant outnumber the recipients of other types of neural prostheses by orders of magnitude. The primary purpose of this article is to provide an overview of contemporary cochlear implants from the perspective of two designers of implant systems. That perspective includes the anatomical situation presented by the deaf cochlea and how the different parts of an implant system (including the user's brain) must work together to produce the best results. In particular, we present the design considerations just mentioned and then describe in detail how the current levels of performance have been achieved. We also describe two recent advances in implant design and performance. In concluding sections, we first present strengths and limitations of present systems and then offer some possibilities for further improvements in this technology. In all, remarkable progress has been made in the development of cochlear implants but much room still remains for improvements, especially for patients presently at the low end of the performance spectrum.

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“…Other novel applications of cochlear implants currently being studied include the use of bilateral implants or bimodal stimulation to improve localization ability (van Hoesel and Tyler, 2003;Seeber et al, 2004;Verschuur et al, 2005;Litovsky et al, 2006), speech perception in the presence of noise (Au et al, 2003;van Hoesel and Tyler, 2003;Vermeir et al, 2003;Ching et al, 2004;Ramsden et al, 2005) and the creation of "virtual channels" by proportionally dividing stimulus current between two or more electrode sites to generate a potentially large number of perceptually distinct pitches using a minimum number of electrode sites (McDermott and McKay, 1994;Donaldson et al, 2005;Kwon and van den Honert, 2006). In each of these areas animal experiments could play an important role in understanding the complex interactions between multiple inputs and how specific electrode design features might be optimized for each purpose.…”

Section: Future Directionsmentioning

confidence: 99%