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Auteur Sumitrajit Dhar
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Distortion Product Otoacoustic Emission Component Behavior as a Function of Primary Frequency Ratio and Primary Level / Alessandra Durante in Ear and hearing, Vol. 43, n°6 (Novembre-Décembre 2022)
Titre : Distortion Product Otoacoustic Emission Component Behavior as a Function of Primary Frequency Ratio and Primary Level Type de document : Article Auteurs : Alessandra Durante ; Uzma Shaheen Akhtar ; Sumitrajit Dhar Année de publication : 2022 Article en page(s) : p. 1824-1835 Note générale : DOI: 10.1097/AUD.0000000000001251 Langues : Anglais (eng) Descripteurs : HE Vinci
Emissions oto-acoustiques à produit de distorsion (DPOAE) ; Emissions otoacoustiques évoquées (OEA)(OAE) ; Produit de distorsion acoustique (PDA)
Résumé : Objectives: Distortion product otoacoustic emissions (DPOAEs) are composed of distortion and reflection components. Much is known about the influence of the stimulus frequency ratio (f2/f1) on the overall/composite DPOAE level. However, the influence of f2/f1 on individual DPOAE components is not as well examined. The goals of this pilot study were to systematically evaluate the effects of f2/f1 on DPOAE components in clinically normal-hearing young adult ears. To extend the limited reports in the literature, this examination was carried out over an extended frequency range using two stimulus-level combinations.
Design: DPOAEs were recorded from seven normal-hearing, young adult ears for f2 frequencies between 0.75 and 16 kHz over a range of f2/f1 using two stimulus-level combinations. The distortion (DPOAED) and reflection (DPOAER) components were separated using an inverse fast Fourier transform algorithm. Optimal ratios for the composite DPOAE and DPOAE components were determined from smoothed versions of level versus ratio functions in each case.
Results: The optimal ratio for the composite DPOAE level increased with stimulus level and decreased as a function of frequency above 1 kHz. The optimal ratios for the DPOAE components followed a similar trend, decreasing with increasing frequency. The optimal ratio for DPOAED was generally higher than that for DPOAER. The overall level for DPOAED was greater than that of DPOAER, both decreasing with increasing frequency. DPOAER, but not DPOAED, became unrecordable above the noise floor at the higher frequencies.
Conclusions: DPOAE components behave similarly but not identically as a function of f2/f1. The ear canal DPOAE is generally dominated by DPOAED. The behavior of DPOAED as a function of f2/f1 is entirely consistent with known properties of cochlear mechanics. The behavior of DPOAER is more variable across ears, perhaps reflective of the increased number of parameters that influence its final form. Attempting to use an f2/f1 that would allow a greater bias of the ear canal DPOAE toward one component or the other does not appear to be practical.
DOI : 10.1097/AUD.0000000000001251|1 Disponible en ligne : Oui En ligne : https://login.ezproxy.vinci.be/login?url=https://ovidsp.ovid.com/ovidweb.cgi?T=J [...] Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=299253
in Ear and hearing > Vol. 43, n°6 (Novembre-Décembre 2022) . - p. 1824-1835[article]Effects of a suppressor tone on distortion product otoacoustic emissions fine structure : why a universal suppressor level is not a practical solution to obtaining single-generator DP-grams / Sumitrajit Dhar in Ear and hearing, Vol.25, n° 6 (Décembre 2004)
Titre : Effects of a suppressor tone on distortion product otoacoustic emissions fine structure : why a universal suppressor level is not a practical solution to obtaining single-generator DP-grams Type de document : Article Auteurs : Sumitrajit Dhar ; Lauren A. Shaffer Année de publication : 2004 Langues : Anglais (eng) Descripteurs : HE Vinci
Produit de distorsion acoustique (PDA)
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in Ear and hearing > Vol.25, n° 6 (Décembre 2004)[article]Factors Associated With Self-Perceived Hearing Handicap in Adults From Hispanic/Latino Background: Findings From the Hispanic Community Health Study/Study of Latinos / Michelle L. Arnold in Ear and hearing, Vol. 42, n°4 (Juillet- Aout 2021)
Titre : Factors Associated With Self-Perceived Hearing Handicap in Adults From Hispanic/Latino Background: Findings From the Hispanic Community Health Study/Study of Latinos Type de document : Article Auteurs : Michelle L. Arnold ; Kathryn Hyer ; Brent J. Small ; Theresa H. Chisolm ; Gabrielle H. Saunders ; Cathy L. McEvoy ; Sumitrajit Dhar ; Kathleen E. Bainbridge ; David J. Lee Année de publication : 2021 Article en page(s) : p. 762-771 Langues : Anglais (eng) Descripteurs : HE Vinci
Déficience auditive ; Santé publique
Hearing handicap inventory for adults (HHI) ; Minorite ethnique
Résumé : Objectives: We sought to determine what factors, including acculturation (language and social contact preferences), were associated with self-perceived hearing handicap among adults from Hispanic/Latino background. We utilized the Aday-Andersen behavioral model of health services utilization to frame our hypotheses that predisposing characteristics (age, sex, education, city of residence, Hispanic/Latino background, and acculturation), enabling resources (annual income and current health insurance coverage), and need (measured hearing loss and self-reported hearing loss) would be related to clinically-significant self-perceived hearing handicap as measured by the Hearing Handicap Inventory - Screening (HHI-S) version.
Design: We analyzed baseline data collected from 2008 to 2011 as part of the multisite Hispanic Community Health Study/Study of Latinos. Data were from 6585 adults with hearing loss (defined by a worse-ear 500, 1000, 2000, and 4000 Hz pure-tone average [PTA] of >=25 dB HL and/or a 4000, 6000, and 8000 Hz high-frequency PTA of >=25 dB HL) aged 18 to 74 years from various Hispanic/Latino backgrounds. We conducted a series of multivariable logistic regression models examining the roles of independent variables of interest representing predisposing, enabling, and need indicators on the occurrence of clinically-significant self-perceived hearing handicap (e.g., HHI-S score > 8).
Results: Among included participants, 953 (14.5%) had an HHI-S score >8. The final model revealed significant associations between predisposing characteristics, enabling resources, need, and HHI-S outcome. Predisposing characteristics and need factors were associated with higher odds of reporting self-perceived hearing handicap (HHI-S score >8) including acculturation as measured by the Short Acculturation Scale for Hispanics (odds ratio [OR] = 1.28, 95% confidence interval [CI]: 1.09-1.50), female sex (OR = 1.72, 95% CI: 1.27-2.33), and poorer worse ear 500, 1000, 2000, and 4000 Hz PTA (OR = 1.02, 95% CI: 1.01-1.03); suggesting that a 5-decibel increase in a person's PTA was consistent with 10% higher odds of a HHI-S score of >8. Greater enabling resources were associated with lower odds of reporting clinically-significant self-perceived hearing handicap: compared with individuals with income $75,000/year was 0.28 (95% CI: 0.13-0.59]; p-trend
Conclusions: Our findings suggest there are associations between predisposing, enabling and need variables consistent with the Aday-Andersen model and self-perceived hearing handicap among adults from Hispanic/Latino background. The influence of language and culture on perceived hearing loss and associated handicap is complex, and deserves more attention in future studies. Our findings warrant further investigation into understanding the role of language and language access in hearing health care utilization and outcomes, as the current body of literature is small and shows mixed outcomes.
DOI : 10.1097/AUD.0000000000000995|1 Disponible en ligne : Oui En ligne : https://login.ezproxy.vinci.be/login?url=https://ovidsp.ovid.com/ovidweb.cgi?T=J [...] Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=273415
in Ear and hearing > Vol. 42, n°4 (Juillet- Aout 2021) . - p. 762-771[article]Interpretability of the audiogram by audiologists and physician non-specialists / Niall A. M. Klyn ; Claire Letendre ; Neeha Shrestha ; Bruce L. Lambert ; Sumitrajit Dhar in International Journal of Audiology IJA, Vol. 60, n°2 (Février 2021)
Titre : Interpretability of the audiogram by audiologists and physician non-specialists Type de document : Article Auteurs : Niall A. M. Klyn ; Claire Letendre ; Neeha Shrestha ; Bruce L. Lambert ; Sumitrajit Dhar Année de publication : 2021 Article en page(s) : p. 133-139 Langues : Anglais (eng) Descripteurs : HE Vinci
Audiogramme ; Communication interdisciplinaire ; Education pour la santé ; Graphique
Counseling en audiologie
Résumé : Objective
The audiogram is frequently used by hearing specialists communicate test results to non-specialists, such as physicians. However, it relies on uncommon terminology and interpreting unusual graphical elements to extract information. In this study, we examine whether the audiogram can be accurately interpreted by specialists and non-specialists.
We used an online questionnaire to assess the interpretability of an audiogram by audiologists and primary-care physicians. Participants viewed a sample audiogram and submitted their answers via an online survey system.
We recruited actively practicing primary care physicians (n = 100) and actively practicing audiologists (n = 67). We only accepted respondents from the United States.
The audiogram was not easily interpreted by physicians, with a median score of 4/9. Fewer than 25% could accurately report a threshold correctly. Audiologists were more accurate than physicians (median score 7/9, Wilcoxon two-sample p
The audiogram is difficult for non-specialists to interpret. Clinicians are advised to supplement or supplant the audiogram in interprofessional communication. The development of tools to facilitate interprofessional communication between audiologists and physicians could have positive effects on physician awareness of hearing loss, and even downstream influences on patient behaviour and outcomes.
DOI : https://doi.org/10.1080/14992027.2020.1805129|1 Accès : Contactez la bibliothèque d'Ixelles si le lien vers la ressource électronique ne fonctionne plus Disponible en ligne : Oui En ligne : https://login.ezproxy.vinci.be/login?url=https://www.tandfonline.com/doi/pdf/10. [...] Format de la ressource électronique : Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=264731
in International Journal of Audiology IJA > Vol. 60, n°2 (Février 2021) . - p. 133-139[article]Otoacoustic Emissions / Sumitrajit Dhar (2012)
Titre : Otoacoustic Emissions : Principles, Procedures and Protocols Type de document : Livre Auteurs : Sumitrajit Dhar ; James W. Hall III Editeur : Plural Publishing Inc Année de publication : 2012 Collection : Core Clinical Concepts in Audiology Importance : 230 p. Format : ill.- ISBN/ISSN/EAN : 978-1-59756-342-0 Prix : $59,95 Langues : Anglais (eng) Descripteurs : HE Vinci
Acouphène ; Anatomie du système auditif ; Emissions otoacoustiques évoquées (OEA)(OAE) ; Emissions otoacoustiques spontanées (OAEs) ; Mesure acoustique ; Ototoxicité ; Pathologie cochléaire ; Produit de distorsion acoustique (PDA)
Physiologie cochleaire ; Physiologie du systeme auditif
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Cote Support Localisation Section Disponibilité L_425_1054 Livre Ixelles Mezzanine Prêt autorisé
DisponiblePredictability of speech-in-noise performance from real ear measures of directional hearing aids / Sumitrajit Dhar in Ear and hearing, Vol.25, n° 2 (Avril 2004)PermalinkSources and mechanisms of DPOAE generation : implications for the prediction of auditory sensitivity / Lauren A. Shaffer in Ear and hearing, Vol.24, n° 5 (Octobre 2003)Permalink