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Otoacoustic emissions recorded at rapid stimulus rates
T W Picton1, A J Kellett, M Vezsenyi
1Human Neuroscience Research Unit, University of Ottawa, Ontario, Canada.
Ear and Hearing
|October 1, 1993
Summary
This study introduces maximum length sequences to record otoacoustic emissions (OAEs) more efficiently. This method significantly reduces recording time for OAEs, aiding in hearing diagnostics.
Area of Science:
- Audiology
- Otoacoustic Emissions
- Signal Processing
Background:
- Otoacoustic emissions (OAEs) are crucial for assessing auditory function.
- Conventional methods for evoking OAEs can be time-consuming.
- Stimulus presentation rates impact OAE recording efficiency and response amplitude.
Purpose of the Study:
- To investigate the efficacy of maximum length sequences (MLS) for evoking otoacoustic emissions.
- To determine if MLS can improve the efficiency of OAE measurements.
- To analyze the impact of rapid stimulus rates on OAE amplitude and signal-to-noise ratio.
Main Methods:
- Otoacoustic emissions were evoked using click stimuli presented via maximum length sequences (MLS).
- Two MLS types were employed: monopolar (click presence/absence) and bipolar (condensation/rarefaction clicks).
- Stimulus rates up to 1000/sec were tested, with analysis focusing on disentangling overlapping responses.
Main Results:
- OAEs can be reliably recorded at stimulus rates up to 1000/sec.
- Response amplitude decreases at higher rates, necessitating more stimuli for consistent signal-to-noise ratio.
- Optimal efficiency for OAE recording was achieved at rates between 200 and 500/sec.
Conclusions:
- Maximum length sequences offer a more time-efficient method for recording otoacoustic emissions.
- Efficient OAE measurement is achievable at stimulus rates of 200-500/sec.
- This technique can reduce OAE recording time by approximately 50% compared to conventional methods.