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The acoustic reflex pattern studied by the averaging technique

F Zito, M Roberto

    Audiology : Official Organ of the International Society of Audiology
    |January 1, 1980
    PubMed
    Summary
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    This study investigated acoustic reflex patterns using signal averaging in normal, sensorineural-impaired, and stapedectomized ears. Acoustic reflexes were observed in normal and impaired ears, but not in stapedectomized ears, with specific waveform patterns noted.

    Area of Science:

    • Audiology
    • Neuroscience
    • Otoacoustic Emissions

    Background:

    • The acoustic reflex is a crucial auditory response.
    • Understanding its pattern and threshold is vital for diagnosing hearing impairments.
    • Previous research has explored acoustic reflex characteristics, but detailed waveform analysis across different hearing statuses requires further investigation.

    Purpose of the Study:

    • To investigate the acoustic reflex threshold and waveform patterns in response to varying sound intensities.
    • To compare these patterns in normal, sensorineural-impaired, and stapedectomized ears.
    • To determine the difference between acoustic reflex threshold and auditory threshold in different ear conditions.

    Main Methods:

    • Utilized the signal-averaging technique to analyze acoustic reflex responses.

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  • Employed tone bursts at frequencies of 500, 1000, 2000, and 4000 Hz.
  • Tested 20 normal, 20 sensorineural-impaired, and 10 stapedectomized ears with stimuli ranging from 0 to 110 dB HL.

    • Main Results:

    • Normal ears exhibited a biphasic reflex pattern (positive then negative) for high-intensity stimuli (100-110 dB HL) and a monophasic pattern for lower intensities (<80 dB HL).
    • Sensorineural-impaired ears showed similar biphasic and monophasic patterns.
    • No acoustic compliance changes were detected in stapedectomized ears across all tested stimuli.

    Conclusions:

    • The signal-averaging technique effectively revealed distinct acoustic reflex patterns in normal and sensorineural-impaired ears.
    • The absence of acoustic reflexes in stapedectomized ears highlights the importance of the stapes in this response.
    • The difference between acoustic reflex and auditory thresholds ranged from 7.5 to 32.5 dB in normal and sensorineural-impaired ears.