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Related Concept Videos

Sound Intensity Level00:53

Sound Intensity Level

Humans perceive sound by hearing. The human ear helps sound waves reach the brain, which then interprets the waves and creates the perception of hearing. The loudness of the environment in which a person is located determines whether they can distinguish between different sound sources.
The human ear can perceive an extensive range of sound intensity, necessitating the use of the logarithmic scale to define a physical quantity—the intensity level. It is a ratio of two intensities and hence a...

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Auditory steady-state responses for estimating moderate hearing loss.

DeWet Swanepoel1, Hettie Erasmus

  • 1Department of Communication Pathology, University of Pretoria, Pretoria, 0002, South Africa. dewet.swanepoel@up.ac.za

European Archives of Oto-Rhino-Laryngology : Official Journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : Affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery
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Summary

Auditory steady-state response (ASSR) reliably estimates moderate to severe hearing loss (≥60 dB). However, increased variability at lower thresholds (<60 dB), especially at 0.5 kHz, warrants caution for objective audiometry.

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Area of Science:

  • Audiology
  • Neuroscience
  • Otolaryngology

Background:

  • Auditory steady-state response (ASSR) is a popular objective audiometry technique.
  • Its efficacy in mild to moderate hearing loss requires further investigation.

Purpose of the Study:

  • To evaluate the usefulness of ASSR in estimating moderate sensorineural hearing loss.
  • To compare ASSR thresholds with behavioral thresholds across various frequencies.

Main Methods:

  • Investigated 7 subjects (12 ears) aged 15-18 with moderate sensorineural hearing loss.
  • Obtained 48 behavioral and ASSR thresholds at 0.5, 1, 2, and 4 kHz using dichotic multiple frequency recording.
  • Analyzed mean differences, standard deviations, and correlation coefficients.

Main Results:

  • Mean threshold differences ranged from 2-8 dB (+/-7-10 dB SD) across frequencies.
  • Higher correlations (0.74-0.88) were observed at 1-4 kHz compared to 0.5 kHz (0.31).
  • ASSR thresholds correlated within 5 dB for 86% of moderate to severe (≥60 dB) behavioral thresholds, versus 29% for mild to moderate (<60 dB) thresholds.

Conclusions:

  • ASSR reliably estimates behavioral thresholds of 60 dB and higher.
  • Increased variability at thresholds below 60 dB, particularly at 0.5 kHz, necessitates caution in objective audiometry.
  • ASSR shows promise for assessing moderate hearing loss, with frequency-dependent accuracy.