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F. Zenker Castro (1) , R. Fernandez Belda (1) , R. Mora Espino (2) & J.J. Barajas de Prat (3)

Universidad de La Laguna. An Objective Procedure Based in Auditory Steady State Responses for the Prescription of Hearing Aid Features. F. Zenker Castro (1) , R. Fernandez Belda (1) , R. Mora Espino (2) & J.J. Barajas de Prat (3).

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F. Zenker Castro (1) , R. Fernandez Belda (1) , R. Mora Espino (2) & J.J. Barajas de Prat (3)

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  1. Universidad de La Laguna An Objective Procedure Based in Auditory Steady State Responses for the Prescription of Hearing Aid Features F. Zenker Castro (1) , R. Fernandez Belda (1) , R. Mora Espino (2) & J.J. Barajas de Prat (3) • Clínica Barajas (2) Fundación Canaria Dr. Barajas para la Prevención e Investigación de la Sordera (3) Universidad de La Laguna • SANTA CRUZ DE TENERIFE - CANARY ISLANDS - SPAIN NHS 2008 Conference Villa Erba Congress Center, Cernobbio (Como Lake), Italy - June 19-21, 2008

  2. True Physiollogical Response Real Physiollogical Response Error Estimation FACTS ABOUT HEARING AID FITTING IN NEWBORN BABIES • It is very comon that at this age the only evidence that we have of the hearing sensitivity is an Auditory Evoked Potential Test. • Most of us rely upon software-assisted automatic hearing aid fittings. • In order to introduce the hearing threshold in this software we need to estimate a conventional audiogram (dB HL) from the physiological response (dB nHL). = 20 dB!!!

  3. Loudness Perception MapASSR Recordings

  4. PREDICTION OF LOUDNESS GROWTH FUNCTION FROM THE ASSR Y = 0.75X0.4 Predicted Loudness (fo) = B0 + B1 * Intensity + B2 * Amplitude Zenker Castro, Franz, Juan Barajas de Prat, Jose and Larumbe Zabala, Eneko (2008). Loudness and auditory steady-state responses in normal-hearing subjects. International Journal of Audiology, 47:5, 269 — 275.

  5. loud speech average speech soft speech Prescription of hearing aid features (Subject TP023 - Right ear) Loudness Perception Map predicted from ASSR ASSR Recording Y = 0.75X0.4 PHYSIOLLOGICAL HEARING THRESHOLD

  6. Dynamic Range (Subject TP023 - 500 Hz ASSR - Right ear) Normal Hearing Refernece Group Zenker F. & Barajas J.J.(2008). ASSRs: Their role in hearing device fitting. In: The Auditory Steady-State Response: generation, recording & clinical application. Edited by Gary Rance. In press.

  7. Dynamic Range (Subject TP023 - 500 Hz ASSR - Right ear) Subject TO023 Normal Hearing Refernece Group Zenker F. & Barajas J.J.(2008). ASSRs: Their role in hearing device fitting. In: The Auditory Steady-State Response: generation, recording & clinical application. Edited by Gary Rance. In press.

  8. Dynamic Range (Subject TP023 - 500 Hz ASSR - Right ear) Subject TO023 Normal Hearing Refernece Group Zenker F. & Barajas J.J.(2008). ASSRs: Their role in hearing device fitting. In: The Auditory Steady-State Response: generation, recording & clinical application. Edited by Gary Rance. In press.

  9. Dynamic Range (Subject TP023 - 500 Hz ASSR - Right ear) 57 84 Subject TO023 Normal Hearing Refernece Group Zenker F. & Barajas J.J.(2008). ASSRs: Their role in hearing device fitting. In: The Auditory Steady-State Response: generation, recording & clinical application. Edited by Gary Rance. In press.

  10. Average Gain (Subject TP023 - 500 Hz ASSR - Right ear) NORMAL HEARING HEARING IMPAIRED 57 (Hearing Threshold) 40 (Lower Limit Speech) G = (57-40) =17 dB Zenker F. & Barajas J.J.(2008). ASSRs: Their role in hearing device fitting. In: The Auditory Steady-State Response: generation, recording & clinical application. Edited by Gary Rance. In press.

  11. Compression (Subject TP023 - 500 Hz ASSR - Right ear) NORMAL HEARING HEARING IMPAIRED 84 (Upper Limit Speech) 57 (Hearing Threshold) C = (84-57)/(80-40) C = 27/40 C = 0.67 Zenker F. & Barajas J.J.(2008). ASSRs: Their role in hearing device fitting. In: The Auditory Steady-State Response: generation, recording & clinical application. Edited by Gary Rance. In press.

  12. Maximum Ouput (Subject TP023 - 500 Hz ASSR - Right ear) MPO = [Loud – B0 – (B2*Amplitude)]/B1 Barajas de Prat, J.J., Zenker Castro, F., Mora Espino, R. and Fernández Belda, R. Prediction of Uncomfortable Loudness Levels in Normal Hearing Adults from the Auditory Steady State Responses. Paper presented at the XXIX International Congress of Audiology, Hong Kong, June 8 - 12, 2008.

  13. Input – Ouput function (Subject TP023 - Right ear) Zenker F. & Barajas J.J.(2008). ASSRs: Their role in hearing device fitting. In: The Auditory Steady-State Response: generation, recording & clinical application. Edited by Gary Rance. In press.

  14. Comparison of REAG using the Nal-NL1, DSL v 4.1 and ASSR-PF(Subject TP023 - Right ear) (*) ASSR-PF = Auditory Steady State Response Prescription Formulae

  15. Conclusions • ASSR-PF can be a first step in fitting hearing aids to newborn babies. • The ASSR-PF enable determinations of basic hearing aid properties such as: Gain, Compression and Maximum Output. • Limitations of the ASSR-PF: • High variability of the amplitude of the ASSR. • Differences in the amplitude-intensity function between adults and newborn babies. • Our reference group is based on normal hearing adult subjects.

  16. Thank you very much for your attention WELCOME! EFAS 2009 TENERIFE SPAIN

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