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Ananthakrishnan S, McElree C, Martin L. Physiological and perceptual auditory consequences of hunting-related recreational firearm noise exposure in young adults with normal hearing sensitivity. Noise Health 2023; 25:8-35. [PMID: 37006114 DOI: 10.4103/nah.nah_53_22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2023] Open
Abstract
Purpose The objective of the current study was to describe outcomes on physiological and perceptual measures of auditory function in human listeners with and without a history of recreational firearm noise exposure related to hunting. Design This study assessed the effects of hunting-related recreational firearm noise exposure on audiometric thresholds, oto-acoustic emissions (OAEs), brainstem neural representation of fundamental frequency (F0) in frequency following responses (FFRs), tonal middle-ear muscle reflex (MEMR) thresholds, and behavioral tests of auditory processing in 20 young adults with normal hearing sensitivity. Results Performance on both physiological (FFR, MEMR) and perceptual (behavioral auditory processing tests) measures of auditory function were largely similar across participants, regardless of hunting-related recreational noise exposure. On both behavioral and neural measures including different listening conditions, performance degraded as difficulty of listening condition increased for both nonhunter and hunter participants. A right-ear advantage was observed in tests of dichotic listening for both nonhunter and hunter participants. Conclusion The null results in the current study could reflect an absence of cochlear synaptopathy in the participating cohort, variability related to participant characteristics and/or test protocols, or an insensitivity of the selected physiological and behavioral auditory measures to noise-induced synaptopathy.
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Giraudet F, Mulliez A, de Resende LM, Beaud L, Benichou T, Brusseau V, Tauveron I, Avan P. Impaired auditory neural performance, another dimension of hearing loss in type-2 diabetes mellitus. Diabetes Metab 2022; 48:101360. [PMID: 35660525 DOI: 10.1016/j.diabet.2022.101360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Accepted: 05/19/2022] [Indexed: 10/18/2022]
Abstract
AIM to evaluate auditory performance in subjects with poorly controlled type-2 diabetes mellitus, using a simple test battery assessing sensitivity to pure tones and neuronal function. METHODS Enrolled subjects, aged between 23-79 years, reported several auditory dysfunctions. They were tested using pure-tone audiometry, otoacoustic emissions for cochlear-function evaluation, and measurement of middle-ear muscle-reflex thresholds in search of an auditory neuropathy. RESULTS Compared to the standard established for an age-matched normative population, the distribution of averaged pure-tone thresholds in enrolled subjects shifted by about one standard deviation with respect to the normal distribution, in line with past reports of mild sensorineural hearing impairment in diabetes, even though many diabetic subjects fell well within the normative interval of audiometric thresholds. Otoacoustic emissions showed that pure-tone thresholds correctly predicted the status of cochlear sensory cells that, by amplifying sound, ensure normal hearing sensitivity. Whereas the observed hearing losses should not have affected the acoustic levels above which the protective middle-ear muscle reflex is triggered by intense sounds, this reflex was undetectable in around 40% enrolled subjects, a marker of auditory neuropathy. CONCLUSION auditory-neural function should be evaluated to identify diabetic subjects whose hearing is impaired. Simple automatic tests are available for this purpose, for example middle-ear muscle reflex detection, which turns out to be more sensitive than the standard audiogram.
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Affiliation(s)
- Fabrice Giraudet
- Laboratoire de Biophysique Neurosensorielle, INSERM, Université Clermont Auvergne, Clermont-Ferrand, France; Laboratoire d'Expertise Auditive, AUDIKA, Clermont-Ferrand, France.
| | - Aurélien Mulliez
- Direction de la Recherche Clinique et de l'Innovation, CHU, Clermont-Ferrand, France.
| | - Luciana Macedo de Resende
- Laboratoire de Biophysique Neurosensorielle, INSERM, Université Clermont Auvergne, Clermont-Ferrand, France.
| | - Ludivine Beaud
- Laboratoire de Biophysique Neurosensorielle, INSERM, Université Clermont Auvergne, Clermont-Ferrand, France.
| | - Thomas Benichou
- Service Endocrinologie Diabète et Maladies Métaboliques, CHU, Clermont-Ferrand, France.
| | - Valentin Brusseau
- Service Endocrinologie Diabète et Maladies Métaboliques, CHU, Clermont-Ferrand, France.
| | - Igor Tauveron
- Service Endocrinologie Diabète et Maladies Métaboliques, CHU, Clermont-Ferrand, France; Laboratoire Génétique Reproduction Développement, INSERM, Université Clermont Auvergne.
| | - Paul Avan
- Laboratoire de Biophysique Neurosensorielle, INSERM, Université Clermont Auvergne, Clermont-Ferrand, France; Institut de l'Audition, Institut Pasteur, INSERM, Paris.
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Causon A, Munro KJ, Plack CJ, Prendergast G. The Role of the Clinically Obtained Acoustic Reflex as a Research Tool for Subclinical Hearing Pathologies. Trends Hear 2020; 24:2331216520972860. [PMID: 33357018 PMCID: PMC7768875 DOI: 10.1177/2331216520972860] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The acoustic reflex (AR) shows promise as an objective test for the presence of cochlear synaptopathy in rodents. The AR has also been shown to be reduced in humans with tinnitus compared to those without. The aim of the present study was twofold: (a) to determine if AR strength (quantified as both threshold and growth) varied with lifetime noise exposure, and thus provided an estimate of the degree of synaptopathy and (b) to identify which factors should be considered when using the AR as a quantitative measure rather than just present/absent responses. AR thresholds and growth functions were measured using ipsilateral and contralateral, broadband and tonal elicitors in adults with normal hearing and varying levels of lifetime noise exposure. Only the clinical standard 226 Hz probe tone was used. AR threshold and growth were not related to lifetime noise exposure, suggesting that routine clinical AR measures are not a sensitive measure when investigating the effects of noise exposure in audiometrically normal listeners. Our secondary, exploratory analyses revealed that AR threshold and growth were significantly related to middle-ear compliance. Listeners with higher middle-ear compliance (though still in the clinically normal range) showed lower AR thresholds and steeper AR growth functions. Furthermore, there was a difference in middle-ear compliance between the sexes, with males showing higher middle-ear compliance values than females. Therefore, it may be necessary to factor middle-ear compliance values into any analysis that uses the AR as an estimate of auditory function.
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Affiliation(s)
- Andrew Causon
- Manchester Centre for Audiology and Deafness, School of Health Sciences, University of Manchester, UK.,Manchester Academic Health Science Centre, Manchester University NHS Foundation Trust, Manchester, England
| | - Kevin J Munro
- Manchester Centre for Audiology and Deafness, School of Health Sciences, University of Manchester, UK.,Manchester Academic Health Science Centre, Manchester University NHS Foundation Trust, Manchester, England
| | - Christopher J Plack
- Manchester Centre for Audiology and Deafness, School of Health Sciences, University of Manchester, UK.,Department of Psychology, Lancaster University, Lancaster, England
| | - Garreth Prendergast
- Manchester Centre for Audiology and Deafness, School of Health Sciences, University of Manchester, UK
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Duron J, Monconduit L, Avan P. Auditory Brainstem Changes in Timing may Underlie Hyperacusis in a Salicylate-induced Acute Rat Model. Neuroscience 2019; 426:129-140. [PMID: 31846750 DOI: 10.1016/j.neuroscience.2019.11.038] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2019] [Revised: 11/23/2019] [Accepted: 11/25/2019] [Indexed: 10/25/2022]
Abstract
Hyperacusis, an exaggerated, sometimes painful perception of loudness even for soft sounds, is a poorly understood distressing condition. While the involvement of modified gain of central auditory neurons and the influence of nonauditory brain regions are well-documented, the issue of where in the auditory system these abnormalities arise remains open, particularly when hyperacusis comes without sensorineural hearing loss. Here we used acute intraperitoneal administration of sodium salicylate (150 mg/kg) in rats, enough to produce > 10-dB decrease in acoustic startle threshold with mild hearing loss at low frequencies (<10 kHz). Anesthesia, necessary for middle-ear-reflex (MEMR) threshold measurements, abolished the olivocochlear efferent reflex but not the MEMR acting on frequencies < 10 kHz, and its mean threshold increased from 55 dB SPL in controls to 80 dB SPL in salicylate-treated animals 60-90 minutes after injection, with an about 3-dB increase in acoustic energy reaching the cochlea. The mean latencies of auditory brainstem-evoked responses (ABR) conspicuously decreased after salicylate, by 0.25 millisecond at 6 kHz at every level, a frequency-dependent effect absent above 12 kHz. A generic model of loudness based upon cross-frequency coincidence detection predicts that with such timing changes, a transient sound may seem as loud at <40 dB SPL as it does in controls at >60 dB SPL. Candidate circuits able to act at the same time on the startle reflex, the MEMR and ABRs may be serotoninergic, as salicylate is known to increase brain serotonin and 5-HT neurons participate in MEMR and ABR circuits.
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Affiliation(s)
- Julie Duron
- School of Medicine, University Clermont Auvergne, 28 Place Henri Dunant, 63000 Clermont-Ferrand, France; UMR INSERM 1107, School of Medicine, 28 Place Henri Dunant, 63000 Clermont-Ferrand, France; Audioconsulting, Audition Conseil, 16 rue Blatin, 63000 Clermont-Ferrand, France.
| | - Lénaic Monconduit
- School of Dentistry, University Clermont Auvergne, 2 Rue de Braga, 63100 Clermont-Ferrand, France; UMR INSERM 1107, School of Medicine, 28 Place Henri Dunant, 63000 Clermont-Ferrand, France.
| | - Paul Avan
- School of Medicine, University Clermont Auvergne, 28 Place Henri Dunant, 63000 Clermont-Ferrand, France; UMR INSERM 1107, School of Medicine, 28 Place Henri Dunant, 63000 Clermont-Ferrand, France; Centre Jean Perrin, 30 rue Montalembert, 63000 Clermont-Ferrand, France.
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Bharadwaj HM, Mai AR, Simpson JM, Choi I, Heinz MG, Shinn-Cunningham BG. Non-Invasive Assays of Cochlear Synaptopathy - Candidates and Considerations. Neuroscience 2019; 407:53-66. [PMID: 30853540 DOI: 10.1016/j.neuroscience.2019.02.031] [Citation(s) in RCA: 64] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2018] [Revised: 02/21/2019] [Accepted: 02/25/2019] [Indexed: 12/31/2022]
Abstract
Studies in multiple species, including in post-mortem human tissue, have shown that normal aging and/or acoustic overexposure can lead to a significant loss of afferent synapses innervating the cochlea. Hypothetically, this cochlear synaptopathy can lead to perceptual deficits in challenging environments and can contribute to central neural effects such as tinnitus. However, because cochlear synaptopathy can occur without any measurable changes in audiometric thresholds, synaptopathy can remain hidden from standard clinical diagnostics. To understand the perceptual sequelae of synaptopathy and to evaluate the efficacy of emerging therapies, sensitive and specific non-invasive measures at the individual patient level need to be established. Pioneering experiments in specific mice strains have helped identify many candidate assays. These include auditory brainstem responses, the middle-ear muscle reflex, envelope-following responses, and extended high-frequency audiograms. Unfortunately, because these non-invasive measures can be also affected by extraneous factors other than synaptopathy, their application and interpretation in humans is not straightforward. Here, we systematically examine six extraneous factors through a series of interrelated human experiments aimed at understanding their effects. Using strategies that may help mitigate the effects of such extraneous factors, we then show that these suprathreshold physiological assays exhibit across-individual correlations with each other indicative of contributions from a common physiological source consistent with cochlear synaptopathy. Finally, we discuss the application of these assays to two key outstanding questions, and discuss some barriers that still remain. This article is part of a Special Issue entitled: Hearing Loss, Tinnitus, Hyperacusis, Central Gain.
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Affiliation(s)
- Hari M Bharadwaj
- Department of Speech, Language, and Hearing Sciences, Purdue University, West Lafayette, IN; Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN.
| | - Alexandra R Mai
- Department of Speech, Language, and Hearing Sciences, Purdue University, West Lafayette, IN
| | - Jennifer M Simpson
- Department of Speech, Language, and Hearing Sciences, Purdue University, West Lafayette, IN
| | - Inyong Choi
- Department of Communication Sciences and Disorders, University of Iowa, Iowa City, IA
| | - Michael G Heinz
- Department of Speech, Language, and Hearing Sciences, Purdue University, West Lafayette, IN; Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN
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Pérez-González P, Johannesen PT, Lopez-Poveda EA. Forward-masking recovery and the assumptions of the temporal masking curve method of inferring cochlear compression. Trends Hear 2014; 19:19/0/2331216514564253. [PMID: 25534365 PMCID: PMC4299367 DOI: 10.1177/2331216514564253] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The temporal masking curve (TMC) method is a behavioral technique for inferring human cochlear compression. The method relies on the assumptions that in the absence of compression, forward-masking recovery is independent of masker level and probe frequency. The present study aimed at testing the validity of these assumptions. Masking recovery was investigated for eight listeners with sensorineural hearing loss carefully selected to have absent or nearly absent distortion product otoacoustic emissions. It is assumed that for these listeners basilar membrane responses are linear, hence that masking recovery is independent of basilar membrane compression. TMCs for probe frequencies of 0.5, 1, 2, 4, and 6 kHz were available for these listeners from a previous study. The dataset included TMCs for masker frequencies equal to the probe frequencies plus reference TMCs measured using a high-frequency probe and a low, off-frequency masker. All of the TMCs were fitted using linear regression, and the resulting slope and intercept values were taken as indicative of masking recovery and masker level, respectively. Results for on-frequency TMCs suggest that forward-masking recovery is generally independent of probe frequency and of masker level and hence that it would be reasonable to use a reference TMC for a high-frequency probe to infer cochlear compression at lower frequencies. Results further show, however, that reference TMCs were sometimes shallower than corresponding on-frequency TMCs for identical probe frequencies, hence that compression could be overestimated in these cases. We discuss possible reasons for this result and the conditions when it might occur.
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Affiliation(s)
- Patricia Pérez-González
- Instituto de Neurociencias de Castilla y León, Universidad de Salamanca, Salamanca, Spain Grupo de Audiología, Instituto de Investigación Biomédica de Salamanca, Salamanca, Spain
| | - Peter T Johannesen
- Instituto de Neurociencias de Castilla y León, Universidad de Salamanca, Salamanca, Spain Grupo de Audiología, Instituto de Investigación Biomédica de Salamanca, Salamanca, Spain
| | - Enrique A Lopez-Poveda
- Instituto de Neurociencias de Castilla y León, Universidad de Salamanca, Salamanca, Spain Grupo de Audiología, Instituto de Investigación Biomédica de Salamanca, Salamanca, Spain Departamento de Cirugía, Facultad de Medicina, Universidad de Salamanca, Salamanca, Spain
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