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López-Ramos D, López-Bascuas LE, Eustaquio-Martín A, Lopez-Poveda EA. Effects of ipsilateral, contralateral, and bilateral noise precursors on psychoacoustical tuning curves in humans. Hear Res 2024; 453:109111. [PMID: 39276590 DOI: 10.1016/j.heares.2024.109111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/13/2024] [Revised: 09/03/2024] [Accepted: 09/07/2024] [Indexed: 09/17/2024]
Abstract
Cochlear tuning and hence auditory frequency selectivity are thought to change in noisy environments by activation of the medial olivocochlear reflex (MOCR). In humans, auditory frequency selectivity is often assessed using psychoacoustical tuning curves (PTCs), a plot of the level required for pure-tone maskers to just mask a fixed-level pure-tone probe as a function of masker frequency. Sometimes, however, the stimuli used to measure a PTC are long enough that they can activate the MOCR by themselves and thus affect the PTC. Here, PTCs for probe frequencies of 500 Hz and 4 kHz were measured in forward masking using short maskers (30 ms) and probes (10 ms) to minimize the activation of the MOCR by the maskers or the probes. PTCs were also measured in the presence of long (300 ms) ipsilateral, contralateral, and bilateral broadband noise precursors to investigate the effect of the ipsilateral, contralateral, and bilateral MOCR on PTC tuning. Four listeners with normal hearing participated in the experiments. At 500 Hz, ipsilateral and bilateral precursors sharpened the PTCs by decreasing the thresholds for maskers with frequencies at or near the probe frequency with minimal effects on thresholds for maskers remote in frequency from the probe. At 4 kHz, by contrast, ipsilateral and bilateral precursors barely affected thresholds for maskers near the probe frequency but broadened PTCs by reducing thresholds for maskers far from the probe. Contralateral precursors barely affected PTCs. An existing computational model was used to interpret the results. The model suggested that despite the apparent differences, the pattern of results is consistent with the ipsilateral and bilateral MOCR inhibiting the cochlear gain similarly at the two probe frequencies and more strongly than the contralateral MOCR.
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Affiliation(s)
- David López-Ramos
- Instituto de Neurociencias de Castilla y León, Universidad de Salamanca 37007 Salamanca, Spain; Instituto de Investigación Biomédica de Salamanca, Universidad de Salamanca 37007 Salamanca, Spain
| | - Luis E López-Bascuas
- Departamento de Psicología Experimental, Procesos Cognitivos y Logopedia, Universidad Complutense de Madrid, 28223 Pozuelo de Alarcón, Madrid, Spain
| | - Almudena Eustaquio-Martín
- Instituto de Neurociencias de Castilla y León, Universidad de Salamanca 37007 Salamanca, Spain; Instituto de Investigación Biomédica de Salamanca, Universidad de Salamanca 37007 Salamanca, Spain
| | - Enrique A Lopez-Poveda
- Instituto de Neurociencias de Castilla y León, Universidad de Salamanca 37007 Salamanca, Spain; Instituto de Investigación Biomédica de Salamanca, Universidad de Salamanca 37007 Salamanca, Spain; Departamento de Cirugía, Facultad de Medicina, Universidad de Salamanca 37007 Salamanca, Spain.
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Lodeiro Colatosti A, Pla Gil I, Morant Ventura A, Latorre Monteagudo E, Chacón Aranda L, Marco Algarra J. Normal hearing and verbal discrimination in real sounds environments. ACTA OTORRINOLARINGOLOGICA ESPANOLA 2024:S2173-5735(24)00066-8. [PMID: 38908790 DOI: 10.1016/j.otoeng.2024.05.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2024] [Accepted: 05/19/2024] [Indexed: 06/24/2024]
Abstract
INTRODUCTION Human beings are constantly exposed to complex acoustic environments every day, which even pose challenges for individuals with normal hearing. Speech perception relies not only on fixed elements within the acoustic wave but is also influenced by various factors. These factors include speech intensity, environmental noise, the presence of other speakers, individual specific characteristics, spatial separatios of sound sources, ambient reverberation, and audiovisual cues. The objective of this study is twofold: to determine the auditory capacity of normal hearing individuals to discriminate spoken words in real-life acoustic conditions and perform a phonetic analysis of misunderstood spoken words. MATERIALS AND METHODS This is a descriptive observational cross-sectional study involving 20 normal hearing individuals. Verbal audiometry was conducted in an open-field environment, with sounds masked by simulated real-word acoustic environment at various sound intensity levels. To enhance sound emission, 2D visual images related to the sounds were displayed on a television. We analyzed the percentage of correct answers and performed a phonetic analysis of misunderstood Spanish bisyllabic words in each environment. RESULTS 14 women (70%) and 6 men (30%), with an average age of 26 ± 5,4 years and a mean airway hearing threshold in the right ear of 10,56 ± 3,52 dB SPL and in the left ear of 10,12 ± 2,49 dB SPL. The percentage of verbal discrimination in the "Ocean" sound environment was 97,2 ± 5,04%, "Restaurant" was 94 ± 4,58%, and "Traffic" was 86,2 ± 9,94% (p = 0,000). Regarding the phonetic analysis, the allophones that exhibited statistically significant differences were as follows: [o] (p = 0,002) within the group of vocalic phonemes, [n] (p = 0,000) of voiced nasal consonants, [r] (p = 0,0016) of voiced fricatives, [b] (p = 0,000) and [g] (p = 0,045) of voiced stops. CONCLUSION The dynamic properties of the acoustic environment can impact the ability of a normal hearing individual to extract information from a voice signal. Our study demonstrates that this ability decreases when the voice signal is masked by one or more simultaneous interfering voices, as observed in a "Restaurant" environment, and when it is masked by a continuous and intense noise environment such as "Traffic". Regarding the phonetic analysis, when the sound environment was composed of continuous-low frequency noise, we found that nasal consonants were particularly challenging to identify. Furthermore in situations with distracting verbal signals, vowels and vibrating consonants exhibited the worst intelligibility.
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Affiliation(s)
- Adriana Lodeiro Colatosti
- Servicio de Otorrinolaringología, Hospital Clínico Universitario de Valencia, Valencia, Spain; Servicio de Otorrinolaringología, Hospital General Universitario de Castellón, Castellón de la Plana, Spain.
| | - Ignacio Pla Gil
- Servicio de Otorrinolaringología, Hospital Clínico Universitario de Valencia, Valencia, Spain; Universidad de Valencia, Valencia, Spain
| | - Antonio Morant Ventura
- Servicio de Otorrinolaringología, Hospital Clínico Universitario de Valencia, Valencia, Spain; Universidad de Valencia, Valencia, Spain
| | | | - Lucía Chacón Aranda
- Servicio de Otorrinolaringología, Hospital Clínico Universitario de Valencia, Valencia, Spain
| | - Jaime Marco Algarra
- Servicio de Otorrinolaringología, Hospital Clínico Universitario de Valencia, Valencia, Spain; Universidad de Valencia, Valencia, Spain
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Schirmer J, Wolpert S, Dapper K, Rühle M, Wertz J, Wouters M, Eldh T, Bader K, Singer W, Gaudrain E, Başkent D, Verhulst S, Braun C, Rüttiger L, Munk MHJ, Dalhoff E, Knipper M. Neural Adaptation at Stimulus Onset and Speed of Neural Processing as Critical Contributors to Speech Comprehension Independent of Hearing Threshold or Age. J Clin Med 2024; 13:2725. [PMID: 38731254 PMCID: PMC11084258 DOI: 10.3390/jcm13092725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2024] [Revised: 04/24/2024] [Accepted: 04/26/2024] [Indexed: 05/13/2024] Open
Abstract
Background: It is assumed that speech comprehension deficits in background noise are caused by age-related or acquired hearing loss. Methods: We examined young, middle-aged, and older individuals with and without hearing threshold loss using pure-tone (PT) audiometry, short-pulsed distortion-product otoacoustic emissions (pDPOAEs), auditory brainstem responses (ABRs), auditory steady-state responses (ASSRs), speech comprehension (OLSA), and syllable discrimination in quiet and noise. Results: A noticeable decline of hearing sensitivity in extended high-frequency regions and its influence on low-frequency-induced ABRs was striking. When testing for differences in OLSA thresholds normalized for PT thresholds (PTTs), marked differences in speech comprehension ability exist not only in noise, but also in quiet, and they exist throughout the whole age range investigated. Listeners with poor speech comprehension in quiet exhibited a relatively lower pDPOAE and, thus, cochlear amplifier performance independent of PTT, smaller and delayed ABRs, and lower performance in vowel-phoneme discrimination below phase-locking limits (/o/-/u/). When OLSA was tested in noise, listeners with poor speech comprehension independent of PTT had larger pDPOAEs and, thus, cochlear amplifier performance, larger ASSR amplitudes, and higher uncomfortable loudness levels, all linked with lower performance of vowel-phoneme discrimination above the phase-locking limit (/i/-/y/). Conslusions: This study indicates that listening in noise in humans has a sizable disadvantage in envelope coding when basilar-membrane compression is compromised. Clearly, and in contrast to previous assumptions, both good and poor speech comprehension can exist independently of differences in PTTs and age, a phenomenon that urgently requires improved techniques to diagnose sound processing at stimulus onset in the clinical routine.
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Affiliation(s)
- Jakob Schirmer
- Department of Otolaryngology, Head and Neck Surgery, University of Tübingen, Elfriede-Aulhorn-Str. 5, 72076 Tübingen, Germany; (J.S.); (S.W.); (K.D.); (M.R.); (J.W.); (T.E.); (K.B.); (W.S.); (L.R.)
| | - Stephan Wolpert
- Department of Otolaryngology, Head and Neck Surgery, University of Tübingen, Elfriede-Aulhorn-Str. 5, 72076 Tübingen, Germany; (J.S.); (S.W.); (K.D.); (M.R.); (J.W.); (T.E.); (K.B.); (W.S.); (L.R.)
| | - Konrad Dapper
- Department of Otolaryngology, Head and Neck Surgery, University of Tübingen, Elfriede-Aulhorn-Str. 5, 72076 Tübingen, Germany; (J.S.); (S.W.); (K.D.); (M.R.); (J.W.); (T.E.); (K.B.); (W.S.); (L.R.)
- Department of Biology, Technical University Darmstadt, 64287 Darmstadt, Germany
| | - Moritz Rühle
- Department of Otolaryngology, Head and Neck Surgery, University of Tübingen, Elfriede-Aulhorn-Str. 5, 72076 Tübingen, Germany; (J.S.); (S.W.); (K.D.); (M.R.); (J.W.); (T.E.); (K.B.); (W.S.); (L.R.)
| | - Jakob Wertz
- Department of Otolaryngology, Head and Neck Surgery, University of Tübingen, Elfriede-Aulhorn-Str. 5, 72076 Tübingen, Germany; (J.S.); (S.W.); (K.D.); (M.R.); (J.W.); (T.E.); (K.B.); (W.S.); (L.R.)
| | - Marjoleen Wouters
- Department of Information Technology, Ghent University, Technologiepark 126, 9052 Zwijnaarde, Belgium; (M.W.); (S.V.)
| | - Therese Eldh
- Department of Otolaryngology, Head and Neck Surgery, University of Tübingen, Elfriede-Aulhorn-Str. 5, 72076 Tübingen, Germany; (J.S.); (S.W.); (K.D.); (M.R.); (J.W.); (T.E.); (K.B.); (W.S.); (L.R.)
| | - Katharina Bader
- Department of Otolaryngology, Head and Neck Surgery, University of Tübingen, Elfriede-Aulhorn-Str. 5, 72076 Tübingen, Germany; (J.S.); (S.W.); (K.D.); (M.R.); (J.W.); (T.E.); (K.B.); (W.S.); (L.R.)
| | - Wibke Singer
- Department of Otolaryngology, Head and Neck Surgery, University of Tübingen, Elfriede-Aulhorn-Str. 5, 72076 Tübingen, Germany; (J.S.); (S.W.); (K.D.); (M.R.); (J.W.); (T.E.); (K.B.); (W.S.); (L.R.)
| | - Etienne Gaudrain
- Lyon Neuroscience Research Center, Centre National de la Recherche Scientifique UMR5292, Inserm U1028, Université Lyon 1, Centre Hospitalier Le Vinatier-Bâtiment 462–Neurocampus, 95 Boulevard Pinel, 69675 Bron CEDEX, France;
- Department of Otorhinolaryngology, University Medical Center Groningen (UMCG), Hanzeplein 1, BB21, 9700 RB Groningen, The Netherlands;
| | - Deniz Başkent
- Department of Otorhinolaryngology, University Medical Center Groningen (UMCG), Hanzeplein 1, BB21, 9700 RB Groningen, The Netherlands;
| | - Sarah Verhulst
- Department of Information Technology, Ghent University, Technologiepark 126, 9052 Zwijnaarde, Belgium; (M.W.); (S.V.)
| | - Christoph Braun
- Magnetoencephalography-Centre and Hertie Institute for Clinical Brain Research, University of Tübingen, Otfried-Müller-Straße 27, 72076 Tübingen, Germany;
- Center for Mind and Brain Research, University of Trento, Palazzo Fedrigotti-corso Bettini 31, 38068 Rovereto, Italy
| | - Lukas Rüttiger
- Department of Otolaryngology, Head and Neck Surgery, University of Tübingen, Elfriede-Aulhorn-Str. 5, 72076 Tübingen, Germany; (J.S.); (S.W.); (K.D.); (M.R.); (J.W.); (T.E.); (K.B.); (W.S.); (L.R.)
| | - Matthias H. J. Munk
- Department of Biology, Technical University Darmstadt, 64287 Darmstadt, Germany
- Department of Psychiatry & Psychotherapy, University of Tübingen, Calwerstraße 14, 72076 Tübingen, Germany
| | - Ernst Dalhoff
- Department of Otolaryngology, Head and Neck Surgery, University of Tübingen, Elfriede-Aulhorn-Str. 5, 72076 Tübingen, Germany; (J.S.); (S.W.); (K.D.); (M.R.); (J.W.); (T.E.); (K.B.); (W.S.); (L.R.)
| | - Marlies Knipper
- Department of Otolaryngology, Head and Neck Surgery, University of Tübingen, Elfriede-Aulhorn-Str. 5, 72076 Tübingen, Germany; (J.S.); (S.W.); (K.D.); (M.R.); (J.W.); (T.E.); (K.B.); (W.S.); (L.R.)
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López-Ramos D, Marrufo-Pérez MI, Eustaquio-Martín A, López-Bascuas LE, Lopez-Poveda EA. Adaptation to Noise in Spectrotemporal Modulation Detection and Word Recognition. Trends Hear 2024; 28:23312165241266322. [PMID: 39267369 PMCID: PMC11401146 DOI: 10.1177/23312165241266322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Revised: 06/10/2024] [Accepted: 06/12/2024] [Indexed: 09/17/2024] Open
Abstract
Noise adaptation is the improvement in auditory function as the signal of interest is delayed in the noise. Here, we investigated if noise adaptation occurs in spectral, temporal, and spectrotemporal modulation detection as well as in speech recognition. Eighteen normal-hearing adults participated in the experiments. In the modulation detection tasks, the signal was a 200ms spectrally and/or temporally modulated ripple noise. The spectral modulation rate was two cycles per octave, the temporal modulation rate was 10 Hz, and the spectrotemporal modulations combined these two modulations, which resulted in a downward-moving ripple. A control experiment was performed to determine if the results generalized to upward-moving ripples. In the speech recognition task, the signal consisted of disyllabic words unprocessed or vocoded to maintain only envelope cues. Modulation detection thresholds at 0 dB signal-to-noise ratio and speech reception thresholds were measured in quiet and in white noise (at 60 dB SPL) for noise-signal onset delays of 50 ms (early condition) and 800 ms (late condition). Adaptation was calculated as the threshold difference between the early and late conditions. Adaptation in word recognition was statistically significant for vocoded words (2.1 dB) but not for natural words (0.6 dB). Adaptation was found to be statistically significant in spectral (2.1 dB) and temporal (2.2 dB) modulation detection but not in spectrotemporal modulation detection (downward ripple: 0.0 dB, upward ripple: -0.4 dB). Findings suggest that noise adaptation in speech recognition is unrelated to improvements in the encoding of spectrotemporal modulation cues.
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Affiliation(s)
- David López-Ramos
- Instituto de Neurociencias de Castilla y León, Universidad de Salamanca, Salamanca, Spain
- Instituto de Investigación Biomédica de Salamanca, Universidad de Salamanca, Salamanca, Spain
| | - Miriam I. Marrufo-Pérez
- Instituto de Neurociencias de Castilla y León, Universidad de Salamanca, Salamanca, Spain
- Instituto de Investigación Biomédica de Salamanca, Universidad de Salamanca, Salamanca, Spain
| | - Almudena Eustaquio-Martín
- Instituto de Neurociencias de Castilla y León, Universidad de Salamanca, Salamanca, Spain
- Instituto de Investigación Biomédica de Salamanca, Universidad de Salamanca, Salamanca, Spain
| | - Luis E. López-Bascuas
- Departamento de Psicología Experimental, Procesos Cognitivos y Logopedia, Universidad Complutense de Madrid, Madrid, Spain
| | - Enrique A. Lopez-Poveda
- Instituto de Neurociencias de Castilla y León, Universidad de Salamanca, Salamanca, Spain
- Instituto de Investigación Biomédica de Salamanca, Universidad de Salamanca, Salamanca, Spain
- Departamento de Cirugía, Facultad de Medicina, Universidad de Salamanca, Salamanca, Spain
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Yang S, Fu Y, Dong S, Yang B, Li Z, Feng C, Reinhardt JD, Shi W, Jia P, Zeng H, Yu B. Association between perceived noise at work and mental health among employed adults in Southwest China. J Affect Disord 2023; 343:22-30. [PMID: 37739020 DOI: 10.1016/j.jad.2023.09.029] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Revised: 08/29/2023] [Accepted: 09/19/2023] [Indexed: 09/24/2023]
Abstract
BACKGROUND Perceived noise at work may contribute more to worsening mental health than objectively measured noise. However, evidence regarding this association is scarce. We investigated the associations of perceived noise at work with anxiety and depression and identified vulnerable subpopulations. METHODS Data from 28,661 participants of the Chinese Cohort of Working Adults (CCWA) were analyzed. Logistic or multinomial logistic regression models were used to determine associations between perceived noise at work and the severity of probable anxiety, depression, and their comorbidity. The generalized additive model with restricted cubic splines was applied to estimate the non-linear trend of associations. RESULTS The mean age of participants was 36.55 ± 10.42 years. We observed that a higher level of perceived noise at work was associated with a higher risk of severe anxiety (OR = 1.55. 95%CI: 1.51-1.59) and severe depression (OR = 1.77. 95%CI: 1.72-1.84). More perceived noise at work was further associated with increased odds of comorbid anxiety and depression (OR = 1.28, 95%CI: 1.26-1.30). We observed an approximately J-shaped curve for the association between perceived noise at work with anxiety, depression, and their comorbidity. Participants, who were male, aged <45 years, had high education levels, and worked on trains were characterized by a greater impact of perceived noise at work on mental health problems. CONCLUSION Increased perceived noise at work was associated with an elevated risk of anxiety, depression, and their comorbidity. These associations were moderated by sex, age, education level and occupation. Interventions targeting perceived noise at work may promote employed adults' mental health.
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Affiliation(s)
- Shujuan Yang
- West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, China; Department of Affiliated Hospital of Chengdu University, Chengdu, Sichuan, China; International Institute of Spatial Health Epidemiology (ISLE), Wuhan University, Wuhan, China.
| | - Yao Fu
- West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Shu Dong
- West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Bo Yang
- Department of Affiliated Hospital of Chengdu University, Chengdu, Sichuan, China
| | - Zhitao Li
- Social Insurance Administration Department, China Railway Chengdu Group Co., Ltd., Chengdu, China
| | - Chuanteng Feng
- West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, China; Institute for Disaster Management and Reconstruction, Sichuan University-The Hong Kong Polytechnic University, Chengdu, China
| | - Jan D Reinhardt
- Institute for Disaster Management and Reconstruction, Sichuan University-The Hong Kong Polytechnic University, Chengdu, China; Jiangsu Province Hospital/Nanjing University First Affiliated Hospital, Nanjing, China; Swiss Paraplegic Research, Nottwil, Switzerland; University of Lucerne, Switzerland
| | - Wei Shi
- Institute for Disaster Management and Reconstruction, Sichuan University-The Hong Kong Polytechnic University, Chengdu, China
| | - Peng Jia
- International Institute of Spatial Health Epidemiology (ISLE), Wuhan University, Wuhan, China; School of Resource and Environmental Sciences, Wuhan University, China
| | - Honglian Zeng
- Department of Affiliated Hospital of Chengdu University, Chengdu, Sichuan, China.
| | - Bin Yu
- West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, China; Institute for Disaster Management and Reconstruction, Sichuan University-The Hong Kong Polytechnic University, Chengdu, China.
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Choi MH, Li N, Popelka G, Butts Pauly K. Development and validation of a computational method to predict unintended auditory brainstem response during transcranial ultrasound neuromodulation in mice. Brain Stimul 2023; 16:1362-1370. [PMID: 37690602 DOI: 10.1016/j.brs.2023.09.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2023] [Revised: 08/03/2023] [Accepted: 09/06/2023] [Indexed: 09/12/2023] Open
Abstract
BACKGROUND Transcranial ultrasound stimulation (TUS) is a promising noninvasive neuromodulation modality. The inadvertent and unpredictable activation of the auditory system in response to TUS obfuscates the interpretation of non-auditory neuromodulatory responses. OBJECTIVE The objective was to develop and validate a computational metric to quantify the susceptibility to unintended auditory brainstem response (ABR) in mice premised on time frequency analyses of TUS signals and auditory sensitivity. METHODS Ultrasound pulses with varying amplitudes, pulse repetition frequencies (PRFs), envelope smoothing profiles, and sinusoidal modulation frequencies were selected. Each pulse's time-varying frequency spectrum was differentiated across time, weighted by the mouse hearing sensitivity, then summed across frequencies. The resulting time-varying function, computationally predicting the ABR, was validated against experimental ABR in mice during TUS with the corresponding pulse. RESULTS There was a significant correlation between experimental ABRs and the computational predictions for 19 TUS signals (R2 = 0.97). CONCLUSIONS To reduce ABR in mice during in vivo TUS studies, 1) reduce the amplitude of a rectangular continuous wave envelope, 2) increase the rise/fall times of a smoothed continuous wave envelope, and/or 3) change the PRF and/or duty cycle of a rectangular or sinusoidal pulsed wave to reduce the gap between pulses and increase the rise/fall time of the overall envelope. This metric can aid researchers performing in vivo mouse studies in selecting TUS signal parameters that minimize unintended ABR. The methods for developing this metric can be adapted to other animal models.
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Affiliation(s)
- Mi Hyun Choi
- Department of Bioengineering, Stanford University, Stanford, CA, 94305, USA.
| | - Ningrui Li
- Department of Electrical Engineering, Stanford University, Stanford, CA, 94305, USA
| | - Gerald Popelka
- Department of Otolaryngology, Stanford School of Medicine, Stanford, CA, 94305, USA; Department of Radiology, Stanford School of Medicine, Stanford, CA, 94305, USA
| | - Kim Butts Pauly
- Department of Bioengineering, Stanford University, Stanford, CA, 94305, USA; Department of Electrical Engineering, Stanford University, Stanford, CA, 94305, USA; Department of Radiology, Stanford School of Medicine, Stanford, CA, 94305, USA.
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Le Prell CG, Clavier OH, Bao J. Noise-induced hearing disorders: Clinical and investigational tools. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2023; 153:711. [PMID: 36732240 PMCID: PMC9889121 DOI: 10.1121/10.0017002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Revised: 01/05/2023] [Accepted: 01/09/2023] [Indexed: 06/18/2023]
Abstract
A series of articles discussing advanced diagnostics that can be used to assess noise injury and associated noise-induced hearing disorders (NIHD) was developed under the umbrella of the United States Department of Defense Hearing Center of Excellence Pharmaceutical Interventions for Hearing Loss working group. The overarching goals of the current series were to provide insight into (1) well-established and more recently developed metrics that are sensitive for detection of cochlear pathology or diagnosis of NIHD, and (2) the tools that are available for characterizing individual noise hazard as personal exposure will vary based on distance to the sound source and placement of hearing protection devices. In addition to discussing the utility of advanced diagnostics in patient care settings, the current articles discuss the selection of outcomes and end points that can be considered for use in clinical trials investigating hearing loss prevention and hearing rehabilitation.
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Affiliation(s)
- Colleen G Le Prell
- Department of Speech, Language, and Hearing Science, University of Texas at Dallas, Richardson, Texas 75080, USA
| | | | - Jianxin Bao
- Gateway Biotechnology Inc., St. Louis, Missouri 63132, USA
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Modeling temporal information encoding by the population of fibers in the healthy and synaptopathic auditory nerve. Hear Res 2022; 426:108621. [PMID: 36182814 DOI: 10.1016/j.heares.2022.108621] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Revised: 09/16/2022] [Accepted: 09/20/2022] [Indexed: 11/23/2022]
Abstract
We report a theoretical study aimed at investigating the impact of cochlear synapse loss (synaptopathy) on the encoding of the envelope (ENV) and temporal fine structure (TFS) of sounds by the population of auditory nerve fibers. A computational model was used to simulate auditory-nerve spike trains evoked by sinusoidally amplitude-modulated (AM) tones at 10 Hz with various carrier frequencies and levels. The model included 16 cochlear channels with characteristic frequencies (CFs) from 250 Hz to 8 kHz. Each channel was innervated by 3, 4 and 10 fibers with low (LSR), medium (MSR), and high spontaneous rates (HSR), respectively. For each channel, spike trains were collapsed into three separate 'population' post-stimulus time histograms (PSTHs), one per fiber type. Information theory was applied to reconstruct the stimulus waveform, ENV, and TFS from one or more PSTHs in a mathematically optimal way. The quality of the reconstruction was regarded as an estimate of the information present in the used PSTHs. Various synaptopathy scenarios were simulated by removing fibers of specific types and/or cochlear regions before stimulus reconstruction. We found that the TFS was predominantly encoded by HSR fibers at all stimulus carrier frequencies and levels. The encoding of the ENV was more complex. At lower levels, the ENV was predominantly encoded by HSR fibers with CFs near the stimulus carrier frequency. At higher levels, the ENV was equally well or better encoded by HSR fibers with CFs different from the AM carrier frequency as by LSR fibers with CFs at the carrier frequency. Altogether, findings suggest that a healthy population of HSR fibers (i.e., including fibers with CFs around and remote from the AM carrier frequency) might be sufficient to encode the ENV and TFS over a wide range of stimulus levels. Findings are discussed regarding their relevance for diagnosing synaptopathy using non-invasive ENV- and TFS-based measures.
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