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Related Experiment Videos

Air versus bone conduction: an equal loudness investigation.

Stefan Stenfelt1, Bo Håkansson

  • 1Department of Signals and Systems, Chalmers University of Technology, SE-412 96 Göteborg, Sweden. stenfelt@s2.chalmers.se

Hearing Research
|July 16, 2002
PubMed
Summary

Air conduction (AC) and bone conduction (BC) loudness functions differ, with a 6-10 dB gap at lower frequencies in normal hearing and sensorineural hearing loss groups. This difference may stem from stapedius muscle contraction or bone transducer distortion.

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Area of Science:

  • Audiology
  • Hearing Science
  • Biophysics

Background:

  • Loudness perception is crucial for understanding auditory function.
  • Differences in loudness perception between air conduction (AC) and bone conduction (BC) are not fully understood.
  • Investigating these differences can reveal insights into the auditory system's mechanics.

Purpose of the Study:

  • To compare loudness functions for AC and BC stimuli across different frequencies and hearing levels.
  • To determine if hearing loss affects the AC-BC loudness balance.
  • To explore potential underlying mechanisms for observed differences.

Main Methods:

  • Loudness balance testing was performed on 23 normal hearing and 8 sensorineural hearing-impaired subjects.
  • Narrow-band noise was presented via earphones (AC) and a bone transducer (BC).

Related Experiment Videos

  • Subjects matched loudness across frequencies (0.25-4 kHz) and hearing levels (30-80 dB HL).

    • Main Results:

    • A 6-10 dB difference was found between AC and BC loudness functions at 0.25-0.75 kHz in normal hearing subjects.
    • This difference reduced to 4-5 dB at higher frequencies (1-4 kHz).
    • Similar AC-BC loudness function differences were observed in the hearing-impaired group.

    Conclusions:

    • AC and BC loudness functions exhibit distinct patterns, particularly at lower frequencies.
    • The findings suggest potential contributions from the stapedius muscle reflex or bone transducer artifacts.
    • Further research is needed to elucidate the precise origins of AC-BC loudness discrepancies.