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Frequency specificity and on-effect in brainstem electric response audiometry

F Debruyne

    The Journal of Otolaryngology
    |August 1, 1982
    PubMed
    Summary
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    The initial cycle of a tone burst effectively triggers auditory brainstem responses. This finding highlights that the brainstem

    Area of Science:

    • Neuroscience
    • Auditory Neuroscience
    • Audiology

    Background:

    • Auditory brainstem responses (ABRs) are crucial for assessing auditory pathway function.
    • Tone bursts are commonly used to evaluate frequency-specific ABRs.
    • The precise acoustic features of tone bursts that elicit ABRs require further clarification.

    Purpose of the Study:

    • To investigate whether the entire tone burst or just its initial part is responsible for evoking ABRs.
    • To determine the frequency specificity of tone bursts and single sine stimuli for ABR measurement.

    Main Methods:

    • Auditory brainstem responses were recorded using standard tone bursts (1-4 kHz; 30-70 dB SL).
    • ABRs were also recorded using only the first cycle (initial period) of the same tone bursts.

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  • Frequency spectra of the initial stimuli were analyzed.

    • Main Results:

    • No significant differences were observed between ABRs elicited by full tone bursts and those elicited by their initial cycle.
    • The initial cycle of a tone burst acts as the effective stimulus for the brainstem potential, indicating an 'on-effect'.
    • Analysis of frequency spectra revealed that the initial cycle provides a more accurate representation of frequency specificity.

    Conclusions:

    • The auditory brainstem response is primarily an 'on-effect', driven by the onset of the stimulus.
    • Using the initial cycle of tone bursts or single sine stimuli maximizes frequency specificity in ABR testing.
    • This finding has implications for refining electrophysiological assessment of auditory function.