Jeremy Marozeau

Jeremy Marozeau
Technical University of Denmark | DTU · Center for Applied Hearing Research

Ph.D.

About

88
Publications
13,444
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1,110
Citations

Publications

Publications (88)
Article
Full-text available
Auditory stream segregation, or separating sounds into their respective sources and tracking them over time, is a fundamental auditory ability. Previous research has separately explored the impacts of aging and musicianship on the ability to separate and follow auditory streams. The current study evaluated the simultaneous effects of age and musici...
Chapter
The cochlear implant (CI) is the most successful neural prosthetic device in the market. It allows hundreds of thousands of people around the world to regain a sense of hearing. However, unlike a pair of glasses that can restore vision perfectly, the CI still has some shortcomings for non-speech sounds such as music and environmental sounds. Many s...
Article
Full-text available
The electric stimulation provided by current cochlear implants (CI) is not power efficient. One underlying problem is the poor efficiency by which information from electric pulses is transformed into auditory nerve responses. A novel stimulation paradigm using ramped pulse shapes has recently been proposed to remedy this inefficiency. The primary m...
Article
Full-text available
The effect of the relative timing between pairs of same-polarity monophasic pulses has been studied extensively in single-neuron animal studies and has revealed fundamental properties of the neurons. For human cochlear implant listeners, the requirement to use charge-balanced stimulation and the typical use of symmetric, biphasic pulses limits such...
Article
Full-text available
It has been suggested that a specialized high-temporal-acuity brainstem pathway can be activated by stimulating more apically in the cochlea than is achieved by cochlear implants (CIs) when programmed with contemporary clinical settings. We performed multiple experiments to test the effect on pitch perception of phantom stimulation and asymmetric c...
Article
Full-text available
Ten cochlear implant (CI) users with single-sided deafness were asked to vary the parameters of an acoustic sound played to their contralateral ear to characterize the perception evoked by a pure tone played through the direct audio input of their CI. Two frequencies, centered on an apical and a medial electrode, were tested. In six subjects, the e...
Preprint
It has been suggested that a specialised high-temporal-acuity brainstem pathway can be activated by stimulating more apically in the cochlea than is achieved by cochlear implants (CIs) when programmed with contemporary clinical settings. Muliple experiments were carried out to test the effect of phantom stimulation and asymmetric current pulses, bo...
Article
Full-text available
Speech recognition in noisy environments remains a challenge for cochlear implant (CI) recipients. Unwanted charge interactions between current pulses, both within and between electrode channels, are likely to impair performance. Here we investigate the effect of reducing the number of current pulses on speech perception. This was achieved by imple...
Preprint
Full-text available
Speech recognition in noisy environments remains a challenge for cochlear implant (CI) recipients. Unwanted charge interactions between current pulses in the same and across different electrode channels are likely to impair performance. Here we investigate the effect of reducing the number of current pulses on speech perception. This was achieved b...
Article
Full-text available
In all commercial cochlear implant (CI) devices, the electric stimulation is performed with a rectangular pulse that generally has two phases of opposite polarity. To date, developing new stimulation strategies has relied on the efficacy of this shape. Here, we investigate the potential of a novel stimulation paradigm that uses biophysically-inspir...
Article
Full-text available
Despite the difficulties experienced by cochlear implant (CI) users in perceiving pitch and harmony, it is not uncommon to see CI users listening to music, or even playing an instrument. Listening to music is a complex process that relies not only on low-level percepts, such as pitch or timbre, but also on emotional reactions or the ability to perc...
Article
Full-text available
Auditory stream segregation is a perceptual process by which the human auditory system groups sounds from different sources into perceptually meaningful elements (e.g., a voice or a melody). The perceptual segregation of sounds is important, for example, for the understanding of speech in noisy scenarios, a particularly challenging task for listene...
Article
Full-text available
Binaural streaming by frequency-proximity was investigated without subjective listener-feedback by modifying the scale illusion of Deutsch [J. Acoust. Soc. Am. 57, 1156–1160 (1975)] into a detection-task. Nineteen listeners had to detect one deviation within a repeating melody stream, while simultaneously presented with a randomized distractor stre...
Chapter
Full-text available
The perception of timbre is fairly well understood for normal-hearing listeners; however, it is still unclear how hearing impairment affects this percept. This chapter addresses how people with severe hearing loss who have been fitted with a cochlear implant perceive timbre. A cochlear implant is a medical device that allows a deaf person to percei...
Article
Full-text available
Cochlear implants (CIs) are neuroprosthetic devices that can provide a sense of hearing to deaf people. However, a CI cannot restore all aspects of hearing. Improvement of the implant technology is needed if CI users are to perceive music and perform in more natural environments, such as hearing out a voice with competing talkers, reflections, and...
Article
Full-text available
The auditory system can theoretically encode frequencies by either the rate or place of stimulation within the cochlea. Previous work with cochlear implants has demonstrated that both changes in timing and place can be described as pitch changes but are perceptually orthogonal. Using multidimensional scaling, the present experiment extends the prev...
Article
Full-text available
The symmetric biphasic pulses used in contemporary cochlear implants (CIs) consist of both cathodic and anodic currents, which may stimulate different sites on spiral ganglion neurons and, potentially, interact with each other. The effect on the order of anodic and cathodic stimulation on loudness at short inter-pulse intervals (IPIs; 0-800 μs) is...
Article
Full-text available
The role of the spatial separation between the stimulating electrodes (electrode separation) in sequential stream segregation was explored in cochlear implant (CI) listeners using a deviant detection task. Twelve CI listeners were instructed to attend to a series of target sounds in the presence of interleaved distractor sounds. A deviant was rando...
Article
Full-text available
The role of temporal cues in sequential stream segregation was investigated in cochlear implant (CI) listeners using a delay detection task composed of a sequence of bursts of pulses (B) on a single electrode interleaved with a second sequence (A) presented on the same electrode with a different pulse rate. In half of the trials, a delay was added...
Conference Paper
Cochlear implant (CI) listeners experience difficulties in complex listening scenarios, where the auditory system is required to segregate a target signal from the competing sound sources. The present study investigated segregation abilities of CI listeners as a function of temporal cues and examined whether a two-stream percept occurs instantaneou...
Article
Full-text available
Sequential stream segregation by cochlear implant (CI) listeners was investigated using a temporal delay detection task composed of a sequence of regularly presented bursts of pulses on a single electrode (B) interleaved with an irregular sequence (A) presented on a different electrode. In half of the trials, a delay was added to the last burst of...
Article
This study systematically investigated the effects of frequency, level, and spectral envelope on pitch matching in twelve bimodal cochlear implant (CI) users. The participants were asked to vary the frequency and level of a pure or complex tone (adjustable sounds) presented in the non-implanted ear to match the pitch and loudness of different refer...
Article
Up to medium intensities and in the 80-100-Hz region, the auditory steady-state response (ASSR) to a multi-tone carrier is commonly considered to be a linear sum of the dipoles from each tone specific ASSR generator. Here, this hypothesis was investigated when a unique modulation frequency is used for all carrier components. Listeners were presente...
Article
In order to keep students activated in a course on musical acoustics, they were asked to build a modular guitar, designed to be updated throughout the course. In the first stage, dedicated to the physics of strings, a guitar was made out of three strings attached to a long piece of wood. The students measured the effect of the place of plucking on...
Article
Full-text available
It has been argued that a main limitation of the cochlear implant is the spread of current induced by each electrode, which activates an inappropriately large range of sensory neurons. To reduce this spread, an alternative stimulation mode, the all-polar mode, was tested with five participants. It was designed to activate all the electrodes simulta...
Poster
Full-text available
Poster contribution at the yearly meeting ”Improving Cochlear Implant Performance” organized by UCL (London)
Article
Full-text available
Difficulty perceiving music is often cited as one of the main problems facing hearing-impaired listeners. It has been suggested that musical enjoyment could be enhanced if sound information absent due to impairment is transmitted via other sensory modalities such as vision or touch. In this study, we test whether tactile cues can be used to segrega...
Chapter
Full-text available
Aims People with impaired hearing often have difficulties in hearing sounds in a noisy background. This problem is partially a result of the auditory systems reduced capacity to process temporal information in the sound signal. In this study we examined the relationships between perceptual sensitivity to temporal fine structure (TFS) cues, brainste...
Article
Full-text available
Musical enjoyment for cochlear implant (CI) recipients is often reported to be unsatisfactory. Our goal was to determine whether the musical experience of postlingually deafened adult CI recipients could be enriched by presenting the bass and treble clef parts of short polyphonic piano pieces separately to each ear (dichotic). Dichotic presentation...
Article
Full-text available
In today's cochlear implant (CI) systems, the monopolar (MP) electrode configuration is the most commonly used stimulation mode, requiring only a single current source. However, with an implant that will allow simultaneous activation of multiple independent current sources, it is possible to implement an all-polar (AP) stimulation mode designed to...
Article
Full-text available
This article reviews Auditory Processing of Temporal Fine Structure: Effects of Age and Hearing Loss by Brian C. J. Moore
Article
Full-text available
The cochlear implant is rightfully considered as one of the greatest success stories in Australian biomedical research and development. It provides sound sensation to hundreds of thousands of people around the world, many of whom are able to understand and produce speech. The device was developed in order to optimize speech perception, and paramete...
Article
This study investigated whether music specially written for people with cochlear implants (CIs) could be used to better pinpoint how the music listening experience for a CI was different to a normal hearing listener (NH). After the specially arranged live concert, focus groups were formed from audience volunteers (two groups each of CIs, NHs and a...
Article
Full-text available
Our ability to listen selectively to single sound sources in complex auditory environments is termed "auditory stream segregation."This ability is affected by peripheral disorders such as hearing loss, as well as plasticity in central processing such as occurs with musical training. Brain plasticity induced by musical training can enhance the abili...
Article
Full-text available
Background: Children with hearing impairments, especially those using hearing devices such as the cochlear implant (CI) or hearing aid (HA), are sometimes not encouraged to attend music classes, as they or their parents and teachers may be unsure whether the child can perform basic musical tasks. Purpose: The objective of the current study was t...
Article
Background: Studies using vocoders as acoustic simulators of cochlear implants have generally focused on simulation of speech understanding, gender recognition, or music appreciation. The aim of the present experiment was to study the auditory sensation perceived by cochlear implant (CI) recipients with steady electrical stimulation on the most-api...
Article
Full-text available
Unlabelled: Although the perception of music is generally poor in cochlear implant users, there are a few excellent performers. Objective: The aim of this study was the assessment of different aspects of music perception in one exceptional cochlear implant user. Design: The assessments included pitch direction discrimination, melody and timbre...
Article
Full-text available
THE AIM OF THIS STUDY WAS TO EXAMINE THE effects of three acoustic 'parameters on the difficulty of segregating a simple 4-note melody from a background of interleaved distractor notes. Melody segregation difficulty ratings were recorded while three acoustic parameters of the distractor notes were varied separately: intensity, temporal envelope, an...
Article
Although cochlear implant (CI) users enjoy good speech understanding, music perception is still difficult or unpleasant for many. This study aimed to assess cognitive, engagement, and auditory responses to new music composed specifically for CI users. From 407 concertgoers who completed a questionnaire, responses from groups of normally hearing lis...
Conference Paper
Full-text available
The enjoyment of music is still difficult for many cochlear implant users. This study aimed to assess cognitive, engagement, and technical responses to new music composed specifically for CI users. From 407 concertgoers who completed a questionnaire, responses from groups of normally-hearing listeners (NH, n = 44) and CI users (n = 44), matched in...
Article
Full-text available
Studies using vocoders as acoustic simulators of cochlear implants have generally focused on simulation of speech understanding, gender recognition, or music appreciation. The aim of the present experiment was to study the auditory sensation perceived by cochlear implant (CI) recipients with steady electrical stimulation on the most-apical electrod...
Data
Hearing threshold levels for the non-implanted ear in each subject. (TIF)
Data
Final acoustic signal with the highest similarity rating from C3 for subject S1. (WAV)
Data
Final acoustic signal with the highest similarity rating from C2 for subject S2. (WAV)
Data
Final acoustic signal with the highest similarity rating from C3 for subject S3. (WAV)
Data
Final acoustic signal with the highest similarity rating from C2 for subject S4. (WAV)
Data
Final acoustic signal with the highest similarity rating from C3 for subject S5. (WAV)
Data
Sketch of the experimental set-up (A) and of the 3 experimental conditions (B). Each subject was asked to compare an electric stimulus with an adjustable acoustic stimulus using a graphical interface (A, left of diagram), as described in the text. The right part of the diagram (B) shows the parameters that were adjusted by the subjects, and the cor...
Data
Mean results for each of the subjects (left panels) and representative spectra for the corresponding sounds (right panels) in each of the 3 conditions (panels A-C). The horizontal and vertical cross-hairs represent the standard deviations of responses provided by each subject. The sizes of the circles represent each subject’s mean similarity rating...
Data
Relevant characteristics of the subjects and their CI systems. (DOC)
Article
This study was designed to evaluate the contribution of temporal and spectral cues for timbre perception in listeners with a cochlear implant (CI) in one ear and low-frequency residual hearing in the contralateral ear (bimodal hearing), and listeners with two CIs. Specifically, it examined the relationship between timbre and speech perception in th...
Article
Full-text available
This article is concerned with the auditory representation of sound intensity, and its perceptual correlate of loudness. Loudness is the primary perceptual correlate of physical sound intensity or strength, often described as the characteristic of sound ranging from very soft to very loud. It discusses intensity discrimination and the dynamic range...
Data
Stimulus display (vision). A video screenshot showing the stimulus display in no-vision blocks. The video is an example of an INC block with the visual stimulus, where the range of possible distracter notes gradually increases towards the melody, making it gradually more difficult to segregate the melody from distracter notes. The rate of change of...
Data
Stimulus display (no-vision). A video screenshot showing the stimulus display in no-vision blocks. The video is an example of an INC block with no visual stimulus, where the range of possible distracter notes gradually increases towards the melody, making it gradually more difficult to segregate the melody from distracter notes. The rate of change...
Article
Full-text available
Enjoyment of music is an important part of life that may be degraded for people with hearing impairments, especially those using cochlear implants. The ability to follow separate lines of melody is an important factor in music appreciation. This ability relies on effective auditory streaming, which is much reduced in people with hearing impairment,...
Conference Paper
Full-text available
The study presented here tests the effect of localisation cues in auditory streaming of musical sounds. A psychoacoustic experiment was run with 7 normal-hearing listeners, to test the segregation of a 4-note repeating melody from pseudo-random interleaved distracter notes. During the experiment, the location of distracter notes was moved through 7...
Article
Full-text available
To estimate real-environment iPod listening levels for listeners in 4 environments to gain insight into whether average listeners receive dosages exceeding occupational noise exposure guidelines as a result of their listening habits. The earbud outputs of iPods were connected directly into the inputs of a digital recorder to make recordings of list...
Chapter
Full-text available
Any chapter dedicated to reviewing models should first try to define what a model is. The question is more difficult than it first appears. Whereas most scientists agree that a model should represent a real-world phenomenon, many disagree on the level of complexity that a model should have. In his chapter on pitch models, De Cheveigné (2004) cites...
Article
Full-text available
The purpose of this study was to investigate musical timbre perception in cochlear-implant (CI) listeners using a multidimensional scaling technique to derive a timbre space. Methods Sixteen stimuli that synthesized western musical instruments were used (McAdams, Winsberg, Donnadieu, De Soete, & Krimphoff, 1995). Eight CI listeners and 15 normal-he...
Conference Paper
The aim of this study was to examine the effects of four acoustic parameters on the difficulty of extracting a simple 4-note melody from a background of distracter notes. Melody extraction difficulty ratings were recorded while four acoustic parameters of the distracter notes were varied separately: fundamental frequency (F0), intensity, temporal e...