Frequency-specific auditory brainstem responses: Effective masking levels and relationship to behavioural thresholds in normal hearing adults

Suzanne C. Purdy, Janene M. Houghton, W. J. Keith, K. Anne Greville*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    29 Citations (Scopus)

    Abstract

    Ipsilateral masking levels and normal thresholds for tone pip auditory brainstem responses (ABRs) were investigated in normal subjects for the purpose of establishing recording parameters and norms for frequency-specific tone pip ABR testing. White noise was found to effectively mask ABRs to tone pips at mean signal-to-noise ratios of between -1 and -5.5 dB [dB peak-equivalent (pe) SPL/dB SPL] depending on the tone pip frequency. ABR thresholds were established for tone pips in the presence of ipsilateral masking with high-pass filtered noise for 500-Hz tone pips and notched noise for tone pips from 1 000 to 4 000 Hz, at a nominal signal-to-noise ratio of -5 dB (i.e. with the noise SPL measured prior to filtering). Thresholds occurred between 28.6 and 36.6 dB pe SPL, equivalent to 4.4-8.8 dB nHL. ABR thresholds for masked and unmasked tone pips did not differ significantly.

    Original languageEnglish
    Pages (from-to)82-91
    Number of pages10
    JournalInternational Journal of Audiology
    Volume28
    Issue number2
    DOIs
    Publication statusPublished - 1989

    Keywords

    • ABR
    • Effective masking levels
    • Frequency specificity
    • Notched noise
    • Tone pips

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