Papers by Katrien Vermeire
Introduction: ‘Bimodal hearing’ refers to the condition in which electrical hearing via a cochlea... more Introduction: ‘Bimodal hearing’ refers to the condition in which electrical hearing via a cochlear implant is combined with residual hearing in the non-implanted ear. Several studies demonstrate improvements in speech perception in noise and sound localization. Mechanisms underlying these benefits are still unclear. The objective of this study is to gain insight into binaural processing in bimodal listeners. Methods: Three bimodal listeners participated in this study. All were implanted with Nucleus devices, of which one with a Hybrid L24. Binaural hearing is investigated using behavioral tests and auditory brainstem responses (ABR). ABRs are recorded in three stimulus conditions: monaural left, monaural right and binaural stimulation. The implanted ear is stimulated electrically, whereas the non-implanted ear is stimulated with 500 Hz tone-bursts. A binaural interaction component is derived from the ABR (ABR-BIC) by subtracting the binaural response from the sum of both monaural re...
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Journal of hearing science, 2017
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Introduction: Bimodal hearing refers to the condition in which electrical hearing via a cochlear ... more Introduction: Bimodal hearing refers to the condition in which electrical hearing via a cochlear implant (CI) is combined with residual hearing in the non-implanted ear. Psychoacoustic research demonstrates improvements in speech perception in noise and sound localization. There is however a large inter-subject variability in bimodal outcome, which may partly be explained by the capacity of the auditory brainstem to integrate electrical and acoustical signals. The present study suggests a technique to assess brainstem processing of bimodal stimulation. Methods: Ten bimodal listeners were included in the study. The non-implanted ear was stimulated acoustically, whereas the implanted ear was stimulated electrically. Before starting the ABR acquisition, the electrical and acoustical stimulation were pitch and loudness balanced. Subsequently, ABRs were recorded in response to monaural acoustical, monaural electrical, and bimodal stimulation. Results: Electrical ABRs were found in all su...
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Inleiding: Met de groeiende populatie ouderen neemt het aantal personen met ouderdomsslechthorend... more Inleiding: Met de groeiende populatie ouderen neemt het aantal personen met ouderdomsslechthorendheid gestaag toe. Hoewel ouderdomsslechthorendheid grotendeels te wijten is aan endocochleaire veranderingen, blijken ook degeneratieve verschijnselen ter hoogte van het centraal auditieve systeem bij te dragen tot deze vorm van slechthorendheid. De huidige studie onderzoekt de effecten van veroudering op een aspect van centraal auditieve verwerking, met name binaurale verwerking. Binaurale verwerking werd in deze studie onderzocht aan de hand van auditief opgewekte hersenstampotentialen (ABR). Literatuur toont namelijk aan dat verschillen tussen de binaurale ABR en de som van de linker en rechter ABR gerelateerd zijn aan binaurale processen. Methodologie: De huidige studie onderzocht bovengenoemde verschillen in proefpersonen van jonge (n=14), middelbare (n=14) en oudere leeftijd (n=14). ABRs werden opgemeten door middel van akoestische stimulatie ter hoogte van het linkeroor, het recht...
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Background The unexplained variability in bimodal outcome impedes clinicians to provide evidence-... more Background The unexplained variability in bimodal outcome impedes clinicians to provide evidence-based counseling regarding contralateral hearing aid (HA) use. There is thus a need for measures of bimodal benefit. This study explores whether bimodal benefit can be assessed using the P300 event-related potential (ERP). Methods Cognitive P300 ERPs were recorded in five bimodal listeners using a low-frequency tonal contrast. Subjects counted the amount of deviant stimuli. The accuracy of the count served as a measure of behavioral performance. To assess the benefit of wearing a contralateral HA, CI-only and bimodal listening were compared. Results P300 ERPs were measurable and reproducible in four subjects. In these subjects, latencies decreased and amplitudes increased in bimodal versus CI-only listening. The subject with the largest improvement in the P300 ERP showed the largest improvement in behavioral performance. Conclusions This study suggests that CI-users generally benefit fro...
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Introduction: Bimodal listeners combine a cochlear implant (CI) with a contralateral hearing aid ... more Introduction: Bimodal listeners combine a cochlear implant (CI) with a contralateral hearing aid (HA). Psychoacoustic research shows that bimodal listening can improve speech perception in noise, sound localization, and music appreciation. Nevertheless, a substantial proportion of bimodal listeners cease to wear the HA shortly after implantation. To date, there is no consensus on whether or not bimodal listening is preferred in a given individual or population. This study examines whether endogenous auditory evoked cortical responses can be used to assess bimodal benefit. Methods: Six experienced CI-users were included in the study. Three used a HA in daily life, whereas the others did not wear a HA. All subjects were implanted with either the Nucleus CI24RE(CA) or CI422 and had low-frequency residual hearing in the non-implanted ear. The cognitive P300 response was elicited using an oddball paradigm with a 500 Hz tone-burst as the standard and a 250 Hz tone-burst as the deviant sti...
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Introduction: Bimodal hearing refers to the condition in which electric hearing via a cochlear im... more Introduction: Bimodal hearing refers to the condition in which electric hearing via a cochlear implant (CI) is combined with residual hearing in the non-implanted ear. There is electrophysiological evidence that binaural integration of electric and acoustic signals occurs in these patients [Battmer et al. unpublished data]. The picture becomes more complex in the case of unilateral electro-acoustic stimulation (EAS). Unilateral electric hearing is then often combined with bilateral low-frequency residual hearing. This raises the question whether these patients only benefit from the presence of bilateral low-frequency information or if also acoustic-electric binaural interaction occurs. In a normative study, we found that binaural interaction can be investigated using 500 Hz tone-burst auditory brainstem responses (500 Hz TB ABR). Using a combination of 500 Hz TB ABR and electrically evoked ABR, acoustic-electric binaural interaction in EAS users with bilateral low-frequency residual...
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Inleiding: Bimodale luisteraars combineren elektrisch horen via een cochleair implantaat (CI) met... more Inleiding: Bimodale luisteraars combineren elektrisch horen via een cochleair implantaat (CI) met contralateraal akoestisch restgehoor. Onderzoek toont aan dat bimodale stimulatie leidt tot verbeteringen op het vlak van geluidskwaliteit, spraakverstaan in rumoer en geluidslokalisatie. Individuele patienten varieren echter aanzienlijk in de resultaten die ze behalen met bimodale stimulatie. Deze variabiliteit is mogelijks te wijten aan de integratie capaciteit van het centraal auditief systeem, een eigenschap die geinitieerd wordt op hersenstamniveau. Tot op heden is er slechts weinig onderzoek verricht naar de integratie van elektrische en akoestisch signalen op hersenstamniveau. De huidige studie stelt dan ook een techniek voor om de verwerking van deze signalen te onderzoeken. Methodologie: Tien bimodale patienten werden in de studie geincludeerd. Het niet-geimplanteerde oor werd akoestisch gestimuleerd. Het geimplanteerde oor werd daarentegen elektrisch gestimuleerd. De akoestisc...
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Introduction: Continuous advances in cochlear implant (CI) technology have led to a relaxation of... more Introduction: Continuous advances in cochlear implant (CI) technology have led to a relaxation of the implantation criteria. Hence, an increasing amount of CI-users combine electrical and acoustical hearing in opposite ears. To date, it is unclear how the central auditory system processes binaurally presented electrical and acoustical signals. This study explores the utility of the auditory brainstem response (ABR) to assess brainstem processing of bimodal stimulation. Methods: Ten CI-users with substantial contralateral residual hearing volunteered in the study. The non-implanted ear was stimulated acoustically, whereas the implanted ear was stimulated acoustically. Before starting the ABR acquisition, the electrical and acoustical stimulation was pitch and loudness balanced. Subsequently, ABRs were recorded to monaural acoustical, monaural electrical, and bimodal stimulation. Results: Electrical ABRs were found in all subjects in both the monaural and bimodal condition. Acoustical...
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Journal of Hearing Science, 2012
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Journal of Alzheimer's Disease, 2019
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International Journal of Audiology, 2019
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Behavioral Sciences, 2019
A systematic review was conducted to investigate whether bilingualism has a protective effect aga... more A systematic review was conducted to investigate whether bilingualism has a protective effect against cognitive decline in aging and can protect against dementia. We searched the Medline, ScienceDirect, Scopus, and ERIC databases with a cut-off date of 31 March 2019, thereby following the guidelines of the Preferred Reporting Items for Systematic Reviews and Meta-analysis (PRISMA) protocol. Our search resulted in 34 eligible studies. Mixed results were found with respect to the protective effect of bilingualism against cognitive decline. Several studies showed a protective effect whereas other studies failed to find it. Moreover, evidence for a delay of the onset of dementia of between 4 and 5.5 years in bilingual individuals compared to monolinguals was found in several studies, but not in all. Methodological differences in the set-up of the studies seem to explain these mixed results. Lifelong bilingualism is a complex individual process, and many factors seem to influence this an...
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Recently, doubts were raised about the existence of the bilingual advantage in cognitive control.... more Recently, doubts were raised about the existence of the bilingual advantage in cognitive control. The aim of the present review was to investigate the bilingual advantage and its modulating factors. We searched the Medline, ScienceDirect, Scopus, and ERIC databases for all original data and reviewed studies on bilingualism and cognitive control, with a cut-off date of October 31, 2018, thereby following the guidelines of the Preferred Reporting Items for Systematic Reviews and Meta-analysis (PRISMA) protocol. The results of the 46 original studies show that, indeed, the majority, 54.3%, reported beneficial effects of bilingualism on cognitive control tasks; however, 28.3% found mixed results, and 17.4% found evidence against its existence. Methodological differences seem to explain these mixed results: particularly, the varying selection of the bilingual participants, the use of non-standardized tests, and the fact that individual differences were often neglected, and that longitudi...
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Journal of Hearing Science, 2012
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The Annals of otology, rhinology, and laryngology, Jan 14, 2015
Purpose of the present study is to evaluate the effects of aging on temporal resolution and speec... more Purpose of the present study is to evaluate the effects of aging on temporal resolution and speech understanding in noise. Twenty-seven young and 33 older normal hearing adults participated in this study. Temporal resolution was investigated using the Gaps in Noise (GIN) test. Understanding sentences in noise was investigated using a Dutch sentences (LIST) test. Results demonstrated that older adults have significantly worse temporal resolution scores and significantly greater difficulty understanding sentences in noise than younger adults. In the group of older adults, the ability to understand sentences in noise correlated with hearing and age. A stepwise regression analysis showed that age was the best predictor for the speech in noise results. However, temporal resolution correlated with hearing, not with age. Results from the GIN test did not correlate with the results from the LIST test. The present study shows that with advancing age, both temporal resolution and speech under...
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International Journal of Pediatric Otorhinolaryngology, 2011
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Acta oto-rhino-laryngologica Belgica, 2002
When assessing a patient with a sensorineural hearing impairment, the most simple and most widely... more When assessing a patient with a sensorineural hearing impairment, the most simple and most widely available technical investigation is pure-tone audiometry. Although it is a subjective measure, the test is very reliable if the patient is cooperative. In this paper we review standards and test-retest reliability for pure-tone audiometry. A pure-tone threshold measurement at a single frequency has a chance of 90% to be repeated between -10 dB and +10 dB compared to the first measurement, assuming no real change in hearing thresholds has occurred. It is also of great importance to use correct gender- and age-specific reference values when interpreting pure-tone threshold measurements. Several large-scale epidemiological studies have been conducted during recent years, and have provided us with reliable gender- and age-specific references. A method to take into account the age-related deterioration is presented. In this method, Z-score audiograms represent traditional thresholds in an a...
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Hearing Research, 2010
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Hearing Research, 2014
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Papers by Katrien Vermeire