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Institution

Cochlear Limited

CompanySydney, New South Wales, Australia
About: Cochlear Limited is a company organization based out in Sydney, New South Wales, Australia. It is known for research contribution in the topics: Cochlear implant & Hearing loss. The organization has 1290 authors who have published 1479 publications receiving 33109 citations. The organization is also known as: кохлеарные Americas & COCHLEAR LIMITED.


Papers
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Journal ArticleDOI
TL;DR: Five bilateral cochlear implant users were tested for their localization abilities and speech understanding in noise, and participated in lateralization tasks to assess the impact of variations in interaural time delays (ITDs) and Interaural level differences (ILDs) for electrical pulse trains under direct computer control.
Abstract: Five bilateral cochlear implant users were tested for their localization abilities and speech understanding in noise, for both monaural and binaural listening conditions. They also participated in lateralization tasks to assess the impact of variations in interaural time delays (ITDs) and interaural level differences (ILDs) for electrical pulse trains under direct computer control. The localization task used pink noise bursts presented from an eight-loudspeaker array spanning an arc of approximately 108° in front of the listeners at ear level (0-degree elevation). Subjects showed large benefits from bilateral device use compared to either side alone. Typical root-mean-square (rms) averaged errors across all eight loudspeakers in the array were about 10° for bilateral device use and ranged from 20° to 60° using either ear alone. Speech reception thresholds (SRTs) were measured for sentences presented from directly in front of the listeners (0°) in spectrally matching speech-weighted noise at either 0°, +90° or −90° for four subjects out of five tested who could perform the task. For noise to either side, bilateral device use showed a substantial benefit over unilateral device use when noise was ipsilateral to the unilateral device. This was primarily because of monaural head-shadow effects, which resulted in robust SRT improvements (P<0.001) of about 4 to 5 dB when ipsilateral and contralateral noise positions were compared. The additional benefit of using both ears compared to the shadowed ear (i.e., binaural unmasking) was only 1 or 2 dB and less robust (P=0.04). Results from the lateralization studies showed consistently good sensitivity to ILDs; better than the smallest level adjustment available in the implants (0.17 dB) for some subjects. Sensitivity to ITDs was moderate on the other hand, typically of the order of 100 μs. ITD sensitivity deteriorated rapidly when stimulation rates for unmodulated pulse-trains increased above a few hundred Hz but at 800 pps showed sensitivity comparable to 50-pps pulse-trains when a 50-Hz modulation was applied. In our opinion, these results clearly demonstrate important benefits are available from bilateral implantation, both for localizing sounds (in quiet) and for listening in noise when signal and noise sources are spatially separated. The data do indicate, however, that effects of interaural timing cues are weaker than those from interaural level cues and according to our psychophysical findings rely on the availability of low-rate information below a few hundred Hz.

460 citations

Journal ArticleDOI
TL;DR: Most of the children in the study will reach a level of over 90% sentence recognition in the auditory-visual condition when their language becomes equivalent to that of a normally hearing 7-year-old, but they will enter secondary school at age 12 with an average language delay of about 4 or 5 years unless they receive concentrated and effective language training.
Abstract: Eighty-seven primary-school children with impaired hearing were evaluated using speech perception, production, and language measures over a 3-year period. Forty-seven children with a mean unaided p...

456 citations

Journal ArticleDOI
TL;DR: The results clearly indicate that binaural advantages can be obtained from using a hearing aid with a cochlear implant in opposite ears and it is recommended that bimodal stimulation be standard practice for rehabilitation of adults who wear unilateral co chlear implants.
Abstract: ObjectiveThis study aimed to investigate 1) how a hearing aid needs to be adjusted for an adult who uses a cochlear implant in the contralateral ear; 2) whether the use of a hearing aid with a cochlear implant leads to interference; and 3) whether adults derive binaural benefits from using a hearing

370 citations

Journal ArticleDOI
TL;DR: Using the protocol outlined in this study, it is possible to reliably record EAP responses from most subjects and for most electrodes in Nucleus CI24M cochlear implant users and these responses are robust and recording these responses does not require that the subject sleep or remain still.
Abstract: Objective:This study outlines a series of experiments using the neural response telemetry (NRT) system of the Nucleus CI24M cochlear implant to measure the electrically evoked compound action potential (EAP). The goal of this investigation was to develop a protocol that allows successful recording o

307 citations

PatentDOI
Hans Leysieffer1
TL;DR: An at least partially implantable system for rehabilitation of a hearing disorder with at least one acoustic sensor (microphone) for picking up an acoustic sensor signal and converting it into corresponding electrical signals, an electronic signal processing unit for audio signal processing and amplification, an electrical power supply unit which supplies individual components of the system with energy as mentioned in this paper.
Abstract: An at least partially implantable system for rehabilitation of a hearing disorder with at least one acoustic sensor (microphone) for picking up an acoustic sensor signal and converting the acoustic sensor signal into corresponding electrical signals, an electronic signal processing unit for audio signal processing and amplification, an electrical power supply unit which supplies individual components of the system with energy, and an output-side actuator stimulation arrangement, the actuator stimulation arrangement has a dual intracochlear arrangement in combination with a stimulator arrangement with at least one stimulator element for at least indirect mechanical stimulation of a damaged inner ear and one electrically acting stimulation electrode arrangement with at least one cochlear implant electrode for electrical stimulation of the inner ear.

301 citations


Authors

Showing all 1293 results

NameH-indexPapersCitations
Marc Moonen6679617837
Robert K. Shepherd5925510679
Matthew W. Kelley531419657
Frank R. Lin5121112431
Peter S. Roland472397660
Peter J. Blamey472087316
Richard C. Dowell461927104
Olivier Sterkers463568162
Blake C. Papsin462406712
Stephen O'Leary452386841
Karl Hörmann443797001
Geoffrey A. Manley441836184
Karen A. Gordon431354594
Hugh J. McDermott431465254
David M. Baguley432406533
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20232
20222
202168
202074
201974
201870