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Adaptation of the acoustic reflex
The Journal of the Acoustical Society of America
|September 1, 1978
Summary
Acoustic reflex adaptation was measured in humans using tonal and noise stimuli. Adaptation rates varied with stimulus intensity and frequency, suggesting an exponential model fits the data.
Area of Science:
- Audiology
- Auditory Neuroscience
- Bioacoustics
Background:
- The acoustic reflex is a protective mechanism in the middle ear.
- Understanding acoustic reflex adaptation is crucial for diagnosing auditory disorders.
Purpose of the Study:
- To investigate the characteristics of acoustic reflex adaptation in human subjects.
- To determine how stimulus parameters influence the rate of acoustic reflex adaptation.
Main Methods:
- Contralateral stapedial reflex measurements using acoustic conductance and susceptance.
- Stimuli included tonal (500-4000 Hz) and broadband noise at various intensities (96-112 dB SPL) for 180 seconds.
- Data analyzed as changes in acoustic admittance and percent of maximum admittance change.
Main Results:
- A systematic drift in static ear admittance was observed without stimulation.
- All tested conditions showed some degree of acoustic reflex adaptation.
- Adaptation half-life and onset time correlated positively with stimulus intensity and negatively with frequency.
Conclusions:
- Acoustic reflex adaptation is influenced by stimulus intensity and frequency.
- An exponential model provides a suitable approximation for describing reflex adaptation.
- These findings contribute to understanding the dynamic properties of the human acoustic reflex.