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The acoustic reflex at a 1000 Hz probe frequency: phasor and vector analysis
1Department of Logopaedics, University of Cape Town.
Summary
Vector plots may clarify reflex growth functions in audiology when phasor plots are unclear. This study found increased stiffness but variable resistance, though mass-dominated ears remain unclarified.
Area of Science:
- Audiology
- Bioacoustics
- Otology
Background:
- Phasor plots of reflex growth functions have yielded inconclusive results for mass-dominated ears.
- The utility of vector plots for analyzing unclear phasor data requires further investigation.
Purpose of the Study:
- To determine if vector plots can clarify the effects of acoustic reflexes for ears with unclear phasor diagrams.
- To analyze admittance data converted to impedance vectors.
Main Methods:
- Measured ipsilateral acoustic reflex admittance data across a wide intensity range from 34 ears.
- Represented data as both phasor diagrams and impedance vectors.
- Analyzed growth functions for stiffness and resistance changes.
Main Results:
- Few unclassifiable phasor diagrams were observed.
- Vector analysis of all growth functions indicated increased stiffness.
- Observed variable changes in resistance.
Conclusions:
- Vector diagrams may offer a clearer representation for audiology data that is ambiguous in phasor plots.
- This study did not clarify the reflex growth function patterns for mass-dominated ears.