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T : 목차정보

Hearing research 15건

  1. [해외논문]   Editorial Board  


    Hearing research v.365 ,pp. ii - ii , 2018 , 0378-5955 ,

    초록

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    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  2. [해외논문]   COMT and the neurogenetic architecture of hearing loss induced tinnitus  

    Vanneste, Sven (Lab for Clinical and Integrative Neuroscience, School for Behavioral and Brain Sciences, University of Texas at Dallas, Richardson, TX, USA ) , Alsalman, Ola (Lab for Clinical and Integrative Neuroscience, School for Behavioral and Brain Sciences, University of Texas at Dallas, Richardson, TX, USA ) , De Ridder, Dirk (Department of Surgical Sciences, Dunedin School of Medicine, University of Otago, New Zealand)
    Hearing research v.365 ,pp. 1 - 15 , 2018 , 0378-5955 ,

    초록

    Abstract As the COMT polymorphism is especially prominent in the prefrontal cortex and has been associated with auditory gating, we hypothesize that tinnitus patients with this polymorphism have altered activity in the ventromedial prefrontal/anterior cingulate areas that modulates the tinnitus percept. To test this, we recruited a total of 40 tinnitus subjects and 20 healthy controls for an EEG study. A comparison between tinnitus subjects and healthy controls and their frequency of being Val/Val genotype or Met carriers (including Val/Met and Met/Met genotype) shows no significant effect, suggesting that the distributions for the tinnitus and healthy groups are similar. Our results show that an interaction between the amount of hearing loss and the COMT Val 158 Met polymorphism can increase susceptibility to the clinical manifestation of tinnitus. We further demonstrate that the parahippocampus becomes involved in tinnitus in patients with hearing loss that are Met carriers. In these patients, the parahippocampus sends more tinnitus information to the pregenual anterior cingulate cortex and auditory cortex that is specifically related with increased loudness. At the same time, the pregenual anterior cingulate cortex, which normally functions as a gatekeeper, is not cancelling this auditory information, ultimately leading to increased tinnitus loudness. Highlights Hearing loss and the COMT Val 158 Met polymorphism interaction increases the clinical manifestation of tinnitus. Parahippocampus becomes involved in tinnitus in patients with hearing loss that are Met carriers. Parahippocampus sends tinnitus related information to the pregenual anterior cingulate cortex. Pregenual anterior cingulate cortex, which normally functions as a gatekeeper, is not cancelling this auditory information, leading to increased tinnitus loudness.

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    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  3. [해외논문]   Estimation of the ear canal displacement field due to in-ear device insertion using a registration method on a human-like artificial ear  

    Benacchio, S. (École de technologie supérieure, 1100 Rue Notre-Dame O, Montréal, QC, H3C 1K3, Canada ) , Doutres, O. (École de technologie supérieure, 1100 Rue Notre-Dame O, Montréal, QC, H3C 1K3, Canada ) , Le Troter, A. (Aix Marseille Université, CNRS, CRMBM, UMR 7339, Marseille, France ) , Varoquaux, A. (Aix Marseille Université, CNRS, CRMBM, UMR 7339, Marseille, France ) , Wagnac, E. (École de technologie supérieure, 1100 Rue Notre-Dame O, Montréal, QC, H3C 1K3, Canada ) , Callot, V. (Aix Marseille Université, CNRS, CRMBM, UMR 7339, Marseille, France ) , Sgard, F. (Institut de recherche Robert-Sauvé)
    Hearing research v.365 ,pp. 16 - 27 , 2018 , 0378-5955 ,

    초록

    Abstract Passive and active in-ear devices (IED) occluding the ear canal are commonly used to (i) protect people from high noise levels (earplugs), (ii) assist people suffering from hearing impairment (hearing aids) or (iii) help people in listening from their sound systems (earbuds). However, the usability and/or efficiency of IEDs can be greatly affected by several discomfort components (physical, acoustical and functional). The mechanical pressure exerted by the IED onto the ear canal walls is greatly suspected to affect the aforementioned comfort components. This physical characteristic is closely related to the displacement field induced by the IED insertion, which has to be known for a better understanding of perceived discomfort. Thus, this paper proposes to validate a method based on medical images to estimate the displacement field of the ear canal walls due to the insertion of an IED. The approach is validated on a human-like artificial ear with canal geometry deformed using two custom molded IEDs with controlled shapes. These geometries are obtained using computed tomography imaging and the displacement field is computed using a registration method. The errors due to the ear canal segmentation and to the registration steps are small enough to compute a relevant estimation of the expected displacement field. Results show that the amplitude of the displacement and its location into the ear canal can be evaluated with an accuracy of ± 0.2 mm and ± 0.4 mm respectively. Preliminary results on images with a degraded resolution indicate that the proposed approach used to assess the displacement field of the ear canal walls using computed tomography images could be applied on magnetic resonance images, which is a preferred method to image human subject ear canals for future investigations. Highlights The geometries of an open and occluded artificial outer ear are obtained using CT imaging. The displacement field due to the in-ear device insertion is estimated using a registration method. The results show that the proposed method is relevant to estimate the ear canal displacement. The method is tested and promising for an application to real human ears using MR imaging.

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    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  4. [해외논문]   Effect of sound level on virtual and free-field localization of brief sounds in the anterior median plane  

    Marmel, Frederic (Instituto de Neurociencias de Castilla y León, Universidad de Salamanca, Calle Pintor Fernando Gallego 1, 37007 Salamanca, Spain ) , Marrufo-Pé (Instituto de Neurociencias de Castilla y León, Universidad de Salamanca, Calle Pintor Fernando Gallego 1, 37007 Salamanca, Spain ) , rez, Miriam I. (Medizinische Physik and Cluster of Excellence Hearing4All, Universität Oldenburg, 26111 Oldenburg, Germany ) , Heeren, Jan (Medizinische Physik and Cluster of Excellence Hearing4All, Universität Oldenburg, 26111 Oldenburg, Germany ) , Ewert, Stephan (Instituto de Neurociencias de Castilla y León, Universidad de Salamanca, Calle Pintor Fernando Gallego 1, 37007 Salamanca, Spain) , Lopez-Poveda, Enrique A.
    Hearing research v.365 ,pp. 28 - 35 , 2018 , 0378-5955 ,

    초록

    Abstract The detection of high-frequency spectral notches has been shown to be worse at 70–80 dB sound pressure level (SPL) than at higher levels up to 100 dB SPL. The performance improvement at levels higher than 70–80 dB SPL has been related to an ‘ideal observer’ comparison of population auditory nerve spike trains to stimuli with and without high-frequency spectral notches. Insofar as vertical localization partly relies on information provided by pinna-based high-frequency spectral notches, we hypothesized that localization would be worse at 70–80 dB SPL than at higher levels. Results from a first experiment using a virtual localization set-up and non-individualized head-related transfer functions (HRTFs) were consistent with this hypothesis, but a second experiment using a free-field set-up showed that vertical localization deteriorates monotonically with increasing level up to 100 dB SPL. These results suggest that listeners use different cues when localizing sound sources in virtual and free-field conditions. In addition, they confirm that the worsening in vertical localization with increasing level continues beyond 70–80 dB SPL, the highest levels tested by previous studies. Further, they suggest that vertical localization, unlike high-frequency spectral notch detection, does not rely on an ‘ideal observer’ analysis of auditory nerve spike trains. Highlights Vertical localization deteriorates with increasing sound level up to 100 dB SPL. Vertical localization is poor when non-individualized HRTFs are used. Vertical localization and high-frequency spectral notch detection use different cues. High-level vertical localization does not use the full auditory nerve information.

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    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  5. [해외논문]   Effects of lifetime noise exposure on the middle-age human auditory brainstem response, tinnitus and speech-in-noise intelligibility  

    Valderrama, Joaquin T. (National Acoustic Laboratories, Australian Hearing Hub, 16 University Avenue, Macquarie University, New South Wales, 2109, Sydney, Australia ) , Beach, Elizabeth Francis (National Acoustic Laboratories, Australian Hearing Hub, 16 University Avenue, Macquarie University, New South Wales, 2109, Sydney, Australia ) , Yeend, Ingrid (National Acoustic Laboratories, Australian Hearing Hub, 16 University Avenue, Macquarie University, New South Wales, 2109, Sydney, Australia ) , Sharma, Mridula (Department of Linguistics, Australian Hearing Hub, 16 University Avenue, Macquarie University, New South Wales, 2109, Sydney, Australia ) , Van Dun, Bram (National Acoustic Laboratories, Australian Hearing Hub, 16 University Avenue, Macquarie University, New South Wales, 2109, Sydney, Australia ) , Dillon, Harvey (National Acoustic Laboratories, Australian Hearing Hub, 16 University Avenue, Macquarie University, New South Wales, 2109, Sydney, Australia)
    Hearing research v.365 ,pp. 36 - 48 , 2018 , 0378-5955 ,

    초록

    Abstract Recent animal studies have shown that the synapses between inner hair cells and the dendrites of the spiral ganglion cells they innervate are the elements in the cochlea most vulnerable to excessive noise exposure. Particularly in rodents, several studies have concluded that exposure to high level octave-band noise for 2 h leads to an irreversible loss of around 50% of synaptic ribbons, leaving audiometric hearing thresholds unaltered. Cochlear synaptopathy following noise exposure is hypothesized to degrade the neural encoding of sounds at the subcortical level, which would help explain certain listening-in-noise difficulties reported by some subjects with otherwise ‘normal’ hearing. In response to this peripheral damage, increased gain of central stages of the auditory system has been observed across several species of mammals, particularly in association with tinnitus. The auditory brainstem response (ABR) wave I amplitude and waves I-V amplitude ratio have been suggested as non-invasive indicators of cochlear synaptopathy and central gain activation respectively, but the evidence for these hearing disorders in humans is inconclusive. In this study, we evaluated the influence of lifetime noise exposure (LNE) on the human ABR and on speech-in-noise intelligibility performance in a large cohort of adults aged 29 to 55. Despite large inter-subject variability, results showed a moderate, but statistically significant, negative correlation between the ABR wave I amplitude and LNE, consistent with cochlear synaptopathy. The results also showed (a) that central gain mechanisms observed in animal studies might also occur in humans, in which higher stages of the auditory pathway appear to compensate for reduced input from the cochlea; (b) that tinnitus was associated with activation of central gain mechanisms; (c) that relevant cognitive and subcortical factors influence speech-in-noise intelligibility, in particular, longer ABR waves I-V interpeak latencies were associated with poorer performance in understanding speech in noise when central gain mechanisms were active; and (d) absence of a significant relationship between LNE and tinnitus, central gain activation or speech-in-noise performance. Although this study supports the possible existence of cochlear synaptopathy in humans, the great degree of variability, the lack of uniformity in central gain activation and the significant involvement of attention in speech-in-noise performance suggests that noise-induced cochlear synaptopathy is, at most, one of several factors that play a role in humans' speech-in-noise performance. Highlights ABR wave I amplitude negatively correlates with lifetime noise exposure. Subjects with tinnitus presented active central gain mechanisms. No systematic effect of noise exposure on human auditory evoked activity. No clear evidence for noise exposure influencing speech-in-noise performance. Central gain and brainstem conduction speed are relevant factors in speech-in-noise.

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    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  6. [해외논문]   Cortical processing of location changes in a “cocktail-party” situation: Spatial oddball effects on electrophysiological correlates of auditory selective attention  

    Lewald, Jö (Faculty of Psychology, Ruhr-Universität Bochum, D-44780, Bochum, Germany ) , rg (Faculty of Psychology, Ruhr-Universität Bochum, D-44780, Bochum, Germany ) , Schlü (Leibniz Research Centre for Working Environment and Human Factors, D-44139, Dortmund, Germany) , ter, Michael-Christian , Getzmann, Stephan
    Hearing research v.365 ,pp. 49 - 61 , 2018 , 0378-5955 ,

    초록

    Abstract Neural mechanisms of selectively attending to a sound source of interest in a simulated “cocktail-party” situation, composed of multiple competing sources, were investigated using event-related potentials in combination with a spatial oddball design. Subjects either detected rare spatial deviants in a series of standard sounds or passively listened. Targets either appeared in isolation or in the presence of two distractor sound sources at different locations (“cocktail-party” condition). Deviant-minus-standard difference potentials revealed mismatch negativity, P3a, and P3b. However, mainly the P3b was modulated by spatial conditions of stimulation, with lower amplitude for “cocktail-party”, than single, sounds. In the active condition, cortical source localization revealed two distinct foci of maximum differences in electrical activity for the contrast of single vs. “cocktail-party” sounds: the right inferior frontal junction and the right anterior superior parietal lobule. These areas may be specifically involved in processes associated with selective attention in a “cocktail-party” situation. Highlights An auditory spatial oddball design revealed ERP correlates of selective attention. The deviance-related P3b subcomponent was modulated by spatial stimulus features. The P3b was reduced with multiple, compared with single target sounds. Related sources were found in right inferior frontal and superior parietal regions. Results argue in favor of a multimodal spatial attention network in human cortex. Graphical abstract [DISPLAY OMISSION]

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    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  7. [해외논문]   Spatial hearing ability of the pigmented Guinea pig (Cavia porcellus): Minimum audible angle and spatial release from masking in azimuth  

    Greene, Nathaniel T. (Department of Physiology & Biophysics, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA ) , Anbuhl, Kelsey L. (Department of Physiology & Biophysics, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA ) , Ferber, Alexander T. (Department of Physiology & Biophysics, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA ) , DeGuzman, Marisa (Neuroscience Training Program, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA ) , Allen, Paul D. (Department of Otolaryngology, University of Rochester, Rochester, NY, 14642, USA ) , Tollin, Daniel J. (Department of Physiology & Biophysics, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA)
    Hearing research v.365 ,pp. 62 - 76 , 2018 , 0378-5955 ,

    초록

    Abstract Despite the common use of guinea pigs in investigations of the neural mechanisms of binaural and spatial hearing, their behavioral capabilities in spatial hearing tasks have surprisingly not been thoroughly investigated. To begin to fill this void, we tested the spatial hearing of adult male guinea pigs in several experiments using a paradigm based on the prepulse inhibition (PPI) of the acoustic startle response. In the first experiment, we presented continuous broadband noise from one speaker location and switched to a second speaker location (the “prepulse”) along the azimuth prior to presenting a brief, ∼110 dB SPL startle-eliciting stimulus. We found that the startle response amplitude was systematically reduced for larger changes in speaker swap angle (i.e., greater PPI), indicating that using the speaker “swap” paradigm is sufficient to assess stimulus detection of spatially separated sounds. In a second set of experiments, we swapped low- and high-pass noise across the midline to estimate their ability to utilize interaural time- and level-difference cues, respectively. The results reveal that guinea pigs can utilize both binaural cues to discriminate azimuthal sound sources. A third set of experiments examined spatial release from masking using a continuous broadband noise masker and a broadband chirp signal, both presented concurrently at various speaker locations. In general, animals displayed an increase in startle amplitude (i.e., lower PPI) when the masker was presented at speaker locations near that of the chirp signal, and reduced startle amplitudes (increased PPI) indicating lower detection thresholds when the noise was presented from more distant speaker locations. In summary, these results indicate that guinea pigs can: 1) discriminate changes in source location within a hemifield as well as across the midline, 2) discriminate sources of low- and high-pass sounds, demonstrating that they can effectively utilize both low-frequency interaural time and high-frequency level difference sound localization cues, and 3) utilize spatial release from masking to discriminate sound sources. This report confirms the guinea pig as a suitable spatial hearing model and reinforces prior estimates of guinea pig hearing ability from acoustical and physiological measurements. Highlights Prepulse inhibition of the acoustic startle response probes spatial hearing. Guinea pigs discriminate sound sources separated by ≥7.5° across the midline. Guinea pigs discriminate sound sources separated by ≥15° within a hemifield. Guinea pig sound discrimination reveals spatial release from masking.

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    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  8. [해외논문]   Increased spontaneous firing rates in auditory midbrain following noise exposure are specifically abolished by a Kv3 channel modulator  

    Anderson, Lucy A. (Ear Institute, University College London, 332 Gray's Inn Road, London, WC1X 8EE, UK ) , Hesse, Lara L. (Ear Institute, University College London, 332 Gray's Inn Road, London, WC1X 8EE, UK ) , Pilati, Nadia (Autifony SRL, Via Ugo Bassi 58b, University of Padova, 35121 Padova, Italy ) , Bakay, Warren M.H. (Ear Institute, University College London, 332 Gray's Inn Road, London, WC1X 8EE, UK ) , Alvaro, Giuseppe (Autifony SRL, Via Ugo Bassi 58b, University of Padova, 35121 Padova, Italy ) , Large, Charles H. (Autifony Therapeutics Ltd., Stevenage Biosciences Catalyst, Gunnels Wood Road, Stevenage, SG1 2FX, UK ) , McAlpine, David (Ear Institute, University College London, 332 Gray's Inn Road, London, WC1X 8EE, UK ) , Schaette, Roland (Ear Institute, University College London, 332 Gray's Inn Road, London, WC1X 8EE, UK ) , Linden, Jennifer F. (Ear Institute, University College London, 332 Gray's Inn Road, London, WC1X 8EE, UK)
    Hearing research v.365 ,pp. 77 - 89 , 2018 , 0378-5955 ,

    초록

    Abstract Noise exposure has been shown to produce long-lasting increases in spontaneous activity in central auditory structures in animal models, and similar pathologies are thought to contribute to clinical phenomena such as hyperacusis or tinnitus in humans. Here we demonstrate that multi-unit spontaneous neuronal activity in the inferior colliculus (IC) of mice is significantly elevated four weeks following noise exposure at recording sites with frequency tuning within or near the noise exposure band, and this selective central auditory pathology can be normalised through administration of a novel compound that modulates activity of Kv3 voltage-gated ion channels. The compound had no statistically significant effect on IC spontaneous activity without noise exposure, nor on thresholds or frequency tuning of tone-evoked responses either with or without noise exposure. Administration of the compound produced some reduction in the magnitude of evoked responses to a broadband noise, but unlike effects on spontaneous rates, these effects on evoked responses were not specific to recording sites with frequency tuning within the noise exposure band. Thus, the results suggest that modulators of Kv3 channels can selectively counteract increases in spontaneous activity in the auditory midbrain associated with noise exposure. Highlights Spontaneous activity in mouse inferior colliculus is elevated after noise exposure. AUT00063, a novel Kv3 channel modulator, normalises this midbrain pathology. No effect of AUT00063 on IC spontaneous activity without noise exposure. No effect of AUT00063 on IC tone-evoked response thresholds or frequency tuning.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  9. [해외논문]   Impact of SNR, masker type and noise reduction processing on sentence recognition performance and listening effort as indicated by the pupil dilation response  

    Ohlenforst, Barbara (Section Ear & Hearing, Dept. of Otolaryngology-Head and Neck Surgery, VU University Medical Center and Amsterdam Public Health Research Institute, Amsterdam, The Netherlands ) , Wendt, Dorothea (Eriksholm Research Center, Oticon A/S, Denmark ) , Kramer, Sophia E. (Section Ear & Hearing, Dept. of Otolaryngology-Head and Neck Surgery, VU University Medical Center and Amsterdam Public Health Research Institute, Amsterdam, The Netherlands ) , Naylor, Graham (MRC/CSO Institute of Hearing Research, Scottish Section, Glasgow, United Kingdom, Part of the University of Nottingham ) , Zekveld, Adriana A. (Section Ear & Hearing, Dept. of Otolaryngology-Head and Neck Surgery, VU University Medical Center and Amsterdam Public Health Research Institute, Amsterdam, The Netherlands ) , Lunner, Thomas (Department of Behavioral Sciences and Learning, Linköping University, Sweden)
    Hearing research v.365 ,pp. 90 - 99 , 2018 , 0378-5955 ,

    초록

    Abstract Recent studies have shown that activating the noise reduction scheme in hearing aids results in a smaller peak pupil dilation (PPD), indicating reduced listening effort, at 50% and 95% correct sentence recognition with a 4-talker masker. The objective of this study was to measure the effect of the noise reduction scheme (on or off) on PPD and sentence recognition across a wide range of signal-to-noise ratios (SNRs) from +16 dB to −12 dB and two masker types (4-talker and stationary noise). Relatively low PPDs were observed at very low (−12 dB) and very high (+16 dB to +8 dB) SNRs presumably due to ‘giving up’ and ‘easy listening’, respectively. The maximum PPD was observed with SNRs at approximately 50% correct sentence recognition. Sentence recognition with both masker types was significantly improved by the noise reduction scheme, which corresponds to the shift in performance from SNR function at approximately 5 dB toward a lower SNR. This intelligibility effect was accompanied by a corresponding effect on the PPD, shifting the peak by approximately 4 dB toward a lower SNR. In addition, with the 4-talker masker, when the noise reduction scheme was active, the PPD was smaller overall than that when the scheme was inactive. We conclude that with the 4-talker masker, noise reduction scheme processing provides a listening effort benefit in addition to any effect associated with improved intelligibility. Thus, the effect of the noise reduction scheme on listening effort incorporates more than can be explained by intelligibility alone, emphasizing the potential importance of measuring listening effort in addition to traditional speech reception measures.

    원문보기

    원문보기
    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  10. [해외논문]   Human medial efferent activity elicited by dynamic versus static contralateral noises  

    Mertes, Ian B.
    Hearing research v.365 ,pp. 100 - 109 , 2018 , 0378-5955 ,

    초록

    Abstract The medial olivocochlear reflex (MOCR) modifies cochlear amplifier function to improve encoding of signals in static noise, but conflicting results have been reported regarding how the MOCR responds to dynamic, temporally-complex noises. The current study utilized three MOCR elicitors with identical spectral content but different temporal properties: broadband noise, amplitude-modulated noise, and speech envelope-modulated noise. MOCR activity was assessed using contralateral inhibition of transient-evoked otoacoustic emissions in 27 normal-hearing young adults. Elicitors were presented contralaterally at two intensities of 50 and 60 dB SPL. Magnitude and growth of contralateral inhibition with increasing elicitor intensity were compared across the three elicitor types. Results revealed that contralateral inhibition was significantly larger at the elicitor intensity of 60 dB SPL than at 50 dB SPL, but there were no significant differences in the magnitude and growth of inhibition across the three elicitors, contrary to hypothesis. These results suggest that the MOCR responds similarly to both static and dynamic noise. Highlights MOCR responded similarly to dynamic and static noise elicitors. MOCR enhanced rather than inhibited TEOAE amplitudes in minority of subjects. Median MOCR growth was 0.11–0.13 dB per 1 dB increase in MOCR elicitor intensity.

    원문보기

    원문보기
    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지

논문관련 이미지