A5029800625- Hearing Loss and Rehabilitation
- Speech and Audio Processing
- Hearing, Cochlea, Tinnitus, Genetics
- Acoustic Wave Phenomena Research
- Structural Health Monitoring Techniques
- Noise Effects and Management
- Neural dynamics and brain function
- Advanced Memory and Neural Computing
- Neuroscience and Music Perception
- Ultrasonics and Acoustic Wave Propagation
- Blind Source Separation Techniques
- Ferroelectric and Piezoelectric Materials
- Ear Surgery and Otitis Media
- Medical Practices and Rehabilitation
- Neural Networks and Applications
- Neuroscience and Neural Engineering
- Advanced Chemical Sensor Technologies
- Hearing Impairment and Communication
- Visual perception and processing mechanisms
- Ultrasound Imaging and Elastography
- Sensor Technology and Measurement Systems
- Acoustic Wave Resonator Technologies
- Advanced Adaptive Filtering Techniques
The University of Melbourne
1989-2025
NextSense
2018-2023
Cochlear (Australia)
2018-2023
SIB Swiss Institute of Bioinformatics
2023
University of Zurich
2000-2023
University Hospital of Zurich
1992-2018
Macquarie University
2018
Google (United States)
2015
Cochlear (Switzerland)
2007
Medizinische Hochschule Hannover
2007
One hundred and forty-seven adult recipients of the Nucleus<sup>®</sup> 24 cochlear implant system, from 13 different European countries, were tested using neural response telemetry to measure electrically evoked compound action potential (ECAP), according a standardised postoperative measurement procedure. Recordings obtained in 96% these subjects with this The group results are presented terms peak amplitude latency, slope growth function ECAP threshold. effects aetiological...
The main aim of this study was to validate a new technique, neural response telemetry (NRT), for measuring the electrically evoked compound action potential in adult cochlear implant users via their Nucleus CI24M implant. Thirty-eight adults were evaluated with variety measurement procedures NRT software. Electrically potentials obtained 31 38 (81.6%) and 132 160 electrodes (82.5%) tested. In addition validating we also established set default clinical test parameters.
Electrocochleography (ECochG) is emerging as a tool for monitoring cochlear function during implant (CI) surgery. ECochG may be recorded directly from electrodes on the array intraoperatively. For low-frequency stimulation, its amplitude tends to rise or plateau electrode inserted. The aim of this study was explore whether compromise signal, defined fall in 30% more insertion, transient permanent, associated with poorer postoperative acoustic hearing, and examine how preoperative hearing...
In Brief Objective: AutoNRT™ is the completely automatic electrically evoked compound action potential (ECAP) measuring algorithm in recently released Nucleus Freedom cochlear implant system. AutoNRT allows clinicians to automatically record T-NRT profiles that turn can be used as a guide for initial fitting. The consists of pattern recognition part judges if traces contain an ECAP and intelligent flow optimizes measurement parameters finds threshold (T-NRT). objective this study was...
Objectives: Real-time monitoring of cochlear function to predict the loss residual hearing after implantation is now possible. Current approaches monitor microphonic (CM) during from electrode at tip implant. A drop in CM response >30% associated with poorer outcomes. However, there prior evidence that amplitude can fluctuate a manner unrelated trauma, leading false positives. By another response, auditory nerve neurophonic (ANN), differentiation between drops result reduced output...
Neural response telemetry (NRT) permits in situ intracochlear recordings of the electrically evoked compound action potential from auditory nerves using scala tympani electrodes. The recorded NRT waveforms can generally be categorized under either single positive peak or double waveforms. This is similar to observations Stypulkowski and van den Honert, who suggested that complex arises two components could axonal dendritic origin, respectively. Using a simple mathematical model which...
Objectives: To explore the factors influencing uptake of cochlear implants in adults, determine impact each factor, and to conceptualize journey implantation from a multistakeholder perspective. Design: Concept mapping was used integrate input multiple stakeholders, with their own experience expertise. This mixed participatory method collects qualitative quantitative data collection enables further analysis. There were two participant cohorts: clients (cochlear implant recipients,...
Contemporary speech processing strategies in cochlear implants (CIs) such as the Advanced Combination Encoder (ACE) use a standard Fast Fourier Transform (FFT) filterbank to extract envelopes. The assignment of FFT bins approximate frequency resolution basilar membrane is only partly based on physiology, especially since are distributed linearly below 1000 Hz and logarithmically above Hz. A Gammatone which provides closer approximation bandwidths filters human auditory system could replace...
AbstractNeural response telemetry (NRT) data from 63 subjects equipped with the Nucleus CI24M Cochlear Implant System generally exhibited little change over up to 4years. Larger changes, when they occurred, were seen only within first 15 months postoperatively, and these changes diminished time. Intraoperative NRT stable enough be used for assisting in initial speech processor fitting sessions. It was not possible predict subjective map threshold comfortable loudness levels (T C levels,...
Purpose Background sounds provided by a wearable sound playback device were mixed with the acoustical input picked up cochlear implant speech processor in an attempt to suppress tinnitus. Method First, patients allowed listen several and select 4 that they thought might be effective. These stimuli programmed loop continuously device. Second, subjects instructed use 1 background each day on device, sequenced selected during 28-day trial. Patients go website at end of rate loudness annoyance...
Cochlear recently released the Nucleus Freedom System which has been based on Research Platform 8. Both systems make use of same implant, CI24RE, includes expanded total stimulation rates up to 32 kHz. In this study performance ACE strategy at 500, 1200 and 3500 pps/channel was investigated using an ABC-CBA design. At end each period speech tests were performed. CBA phase patients completed a comparative questionnaire determine subjective rate preference. Preliminary results in 13 recipients...
The Nucleus(®) 5 System Sound Processor (CP810, Cochlear™, Macquarie University, NSW, Australia) contains two omnidirectional microphones. They can be configured as a fixed directional microphone combination (called Zoom) or an adaptive beamformer Beam), which adjusts the directivity continuously to maximally reduce interfering noise. Initial evaluation studies with CP810 had compared performance and usability of new processor in comparison Freedom™ (Cochlear™) for speech quiet noise subset...
A bio-inspired coding (BIC) strategy was implemented in this study with the goal of better representation spectral and temporal information. The auditory nerve fibers' (ANFs) characteristics such as refractory recovery, facilitation spatial spread were obtained from ECAP data recorded 11 CI recipients. These characteristics, together a non-individualized model-derived adaptation effect, integrated into BIC for selection channels. Two variations compared to conventional advanced combination...
Auditory nerve fibers' (ANFs) refractoriness and facilitation can be quantified in electrically evoked compound action potentials (ECAPs) recorded via neural response telemetry (NRT). Although has been observed animals human cochlear implant (CI) recipients, no study modeled this CI users until now. In study, recovery effects at different masker probe levels for three test electrodes (E6, E12 E18) 11 subjects were recorded. The ECAP by exponential functions the same function used +10 CL...
This study investigates the effect of Nucleus CI24RE implant's neural response telemetry (NRT) system, which has less internal noise compared to its predecessor, CI24M/R implant, on NRT threshold (TNRT) profile across array. measurements were simulated by ignoring with amplitudes below 50 uV. Comparisons estimated TNRTs from and simulations suggest that, apart a constant level difference, TNRT profiles newer implant generally would not have differed very much those predecessor. view was also...
Clinical registries have great potential for quality control of medical procedures regarding the indications, therapeutic processes and results, including their possible complications. This is particularly true when providing patients with severe hearing loss or deafness a cochlear implant (CI). treatment represents lifelong care process that requires continuous over time. On initiative Executive Committee German Society Otorhinolaryngology (Deutsche Gesellschaft für...
Comparisons of the subjective loudness growth function and objective evoked compound action potential (ECAP) amplitude indicate that both functions are exponential in nature. This implies a more accurate estimate ECAP threshold would be obtained using regression instead currently used linear regression. The perceptual seem to approach each other when stimulation rate is lowered reduce temporal summation effects. effect on will have taken into account trying use for predicting threshold.
Current cochlear implants can operate at high pulse rates. The effect of increasing rate on speech performance is not yet clear. Habituation to low rates may affect the outcome. This paper presents results three subsequent studies using different experimental paradigms, applying Nucleus CI24RE device, and conducted by ten European implant teams. Pulse per channel varied from 500 3500 pulses second with ACE 1200 pps CIS strategy. showed that first presented had little finally preferred rate....
Cochlear implant signal processing strategies define the rules of how acoustic signals are converted into electrical stimulation patterns. Technological and anatomical limitations, however, impose constraints on transmission accurate excitation auditory nerve. Acoustic degraded throughout cochlear processing, interactions at electrode-neuron interface constrain spectral temporal precision. In this work, we propose a novel InterlACE strategy to counteract occurring limitations.
A novel cochlear implant coding strategy based on the neural excitability has been developed and implemented using Matlab/Simulink. Unlike present day strategies, Excitability Controlled Coding (ECC) uses a model of state target population to determine its stimulus selection, with aim more efficient stimulation as well reduced channel interaction. Central ECC algorithm is an model, which takes into account supposed refractory behaviour stimulated populations. The state, used weight input...
Being able to display and analyse the output of a speech processor that encodes parameters complex stimuli be presented by cochlear implant (CI) is useful for software hardware development as well diagnostic purposes. This firstly requires appropriate receive decode radio frequency (RF)-coded signals, then processing decoded data using suitable software. The PCI-IF6 clinical Nucleus CI system, together with Implant Communicator Matlab Toolbox research libraries, provide necessary...