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Related Experiment Videos

Multiple auditory steady-state responses (MASTER): stimulus and recording parameters

M S John1, O G Lins, B L Boucher

  • 1Rotman Research Institute, Baycrest Centre for Geriatric Care, University of Toronto, Canada.

Audiology : Official Organ of the International Society of Audiology
|April 21, 1998
PubMed
Summary
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Multiple simultaneous auditory stimuli can be used in evoked potential audiometry, especially with carrier frequencies separated by an octave and at intensities of 60 dB SPL or less. Bandpass noise may be a superior carrier signal compared to pure tones.

Area of Science:

  • Auditory electrophysiology
  • Audiometry
  • Psychoacoustics

Background:

  • Evoked potential audiometry often uses single auditory stimuli.
  • Simultaneous presentation of multiple stimuli could potentially improve efficiency.
  • Understanding interactions between simultaneous stimuli is crucial for optimizing audiometric protocols.

Purpose of the Study:

  • To investigate the effects of simultaneous amplitude-modulated tones on steady-state evoked potentials.
  • To determine optimal parameters for using multiple stimuli in evoked potential audiometry.
  • To compare the efficacy of pure tone versus noise carriers.

Main Methods:

  • Measured steady-state responses by analyzing spectral components corresponding to modulation frequencies.

Related Experiment Videos

  • Presented simultaneous amplitude-modulated tones with varying carrier frequencies, intensities, and modulation frequencies.
  • Utilized pure tones and bandpass noise as carrier signals.

    • Main Results:

    • Significant interactions and attenuation occurred when carrier frequencies were less than half an octave apart at 60 dB SPL.
    • No significant response amplitude decrease was observed with four stimuli if carrier frequencies differed by one octave or more.
    • Higher intensities (70 dB SPL) led to greater stimulus interactions compared to lower intensities (35 dB SPL).
    • Bandpass noise carriers yielded significantly larger responses than pure tone carriers at the same sound pressure level.
    • Modulation frequencies between 30-50 Hz showed greater interactions than faster modulation frequencies.

    Conclusions:

    • The multiple stimulus technique is effective for steady-state responses within 70-110 Hz modulation frequencies.
    • Up to four simultaneous stimuli are feasible without significant amplitude loss if carrier frequencies are separated by an octave and intensity is ≤60 dB SPL.
    • Bandpass noise may be a more effective carrier signal than pure tones for evoked potential audiometry.