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Role of probe tone parameters in frequency selectivity for normal listeners
S M Abel1, M B Cheskes, C Giguere
1Department of Otolaryngology, Mount Sinai Hospital, University of Toronto, Ontario, Canada.
The Journal of Otolaryngology
|August 1, 1989
Summary
Probe tone energy significantly impacts frequency selectivity, affecting psychophysical tuning curves. Lowering probe energy can lead to atypical results, similar to those seen in hearing impairment.
Area of Science:
- Auditory Neuroscience
- Psychoacoustics
- Hearing Science
Background:
- Frequency selectivity is the auditory system's ability to discern sound frequencies.
- Psychophysical tuning curves (PTCs) typically assess frequency selectivity.
- Standard PTC measurement involves varying masker frequency for a fixed probe tone.
Purpose of the Study:
- To investigate the role of probe tone parameters in frequency selectivity.
- To explore how probe tone energy, duration, and intensity influence PTC shape.
- To determine the critical probe tone parameter affecting PTCs.
Main Methods:
- Generated a series of PTCs using tone probes with constant energy but varying frequency, duration, and intensity.
- Tested three normal-hearing subjects.
- Analyzed the resulting tuning curve shapes.
Main Results:
- Probe tone energy was identified as the critical parameter influencing PTC shape.
- Reduced probe energy (< usual levels) resulted in aberrant tuning curve shapes.
- These aberrant shapes resembled those observed in hearing-impaired listeners.
Conclusions:
- Probe tone energy is a key determinant of frequency selectivity measurements.
- Temporal summation may explain the observed effects of probe energy.
- Findings suggest implications for understanding hearing impairment and standard testing protocols.