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UNCOMFORTABLE LOUDNESS LEVELS IN NORMAL HEARING ADULTS DERIVED FROM THE AUDITORY STEADY STATE RESPONSES

Mora Espino R (1,2), Zenker F (1,2), Fernández Belda R (3,1,2), and Barajas de Prat JJ (4,2,1).

(1) Fundación Dr. Barajas, S/C de Tenerife, Spain;(2) Clínica Barajas, S/C de Tenerife, Spain; (3) Hospital Universitario Nuestra Señora de la Candelaria, S/C de Tenerife, Spain; (4) Universidad de La Laguna. S/C de Tenerife, Spain.

Determination of the frequency-specific uncomfortable loudness level (ULL) is an important requirement for hearing aid fitting. Subjective ULL assessment procedures are of limited value in neonates, infants, babies, toddlers and uncooperative children and adults. Alternative objective techniques such as physiological measures have been used in order to predict subjective ULLs.

In this study is established whether the Auditory Steady State Responses (ASSR) can be used to predict uncomfortable loudness levels (ULLs) in a group of normal hearing adults. Subjective ULLs were obtained using standard procedures. Objective ULL were obtained from parameter-intensity functions using amplitude and phase of the ASSR.

Preliminary result shows that the best predictions of the subjective ULL were using individual phase-intensity functions. Poor predictions were obtained from the amplitude-intensity functions due to high inter-subject variability. The best predictions were considered sufficiently accurate to warrant further investigation in patients with varying degrees of hearing loss.

E-mail: mora@clinicabarajas.com

 

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