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Related Experiment Videos

Auditory brainstem responses: masking related changes in wave VI.

A Reid, J P Birchall, D A Moffat

    British Journal of Audiology
    |February 1, 1984
    PubMed
    Summary

    Auditory brainstem responses (ABRs) showed that high-intensity sounds (90 dB SL) can involve cross-ear activity. Contralateral masking reduced wave VI amplitude, suggesting summation of responses from both ears at higher sound levels.

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    Area of Science:

    • Neuroscience
    • Audiology
    • Auditory Evoked Potentials

    Background:

    • Auditory brainstem responses (ABRs) assess the auditory pathway's integrity.
    • Understanding the influence of contralateral masking on ABRs is crucial for accurate interpretation.

    Purpose of the Study:

    • To investigate the effect of contralateral masking on wave VI amplitude in normally-hearing subjects.
    • To explore potential cross-ear neural summation at high stimulus intensities.

    Main Methods:

    • ABRs were recorded in nine normally-hearing individuals.
    • Wide-band clicks were presented at 70, 80, and 90 dB SL.
    • Stimuli were delivered both with and without 50 dB SL contralateral masking.

    Main Results:

    • Wave VI amplitude was significantly reduced by contralateral masking at 90 dB SL.
    • No significant masking effect was observed at 70 and 80 dB SL.
    • This suggests a summation of ipsilateral wave VI and contralateral wave V at 90 dB SL.

    Conclusions:

    • Contralateral masking reveals cross-ear neural activity at high stimulus levels (90 dB SL).
    • The findings highlight the importance of considering binaural interactions in ABR interpretation.
    • This has implications for understanding auditory processing and potential diagnostic applications.

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