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Interactions between amplitude modulation and frequency modulation processing: Effects of age and hearing loss.
Nihaad Paraouty1, Stephan D Ewert2, Nicolas Wallaert1
1Laboratoire des Systèmes Perceptifs (CNRS UMR 8248), Institut d'Etude de la Cognition, Ecole normale supérieure, Paris Sciences et Lettres Research University, 29 rue d'Ulm, 75005 Paris, France.
The Journal of the Acoustical Society of America
|August 1, 2016
Summary
This study investigated how age and hearing loss affect the detection of amplitude modulation (AM) and frequency modulation (FM). Results show that while AM detection is robust, FM detection is impaired by aging and hearing loss, especially when both modulations are present.
Area of Science:
- Auditory perception
- Psychoacoustics
- Signal processing
Background:
- Amplitude modulation (AM) and frequency modulation (FM) are fundamental aspects of auditory signals.
- Understanding the detection thresholds of AM and FM is crucial for diagnosing hearing impairments.
- The interplay between AM and FM detection and its susceptibility to aging and hearing loss requires further investigation.
Purpose of the Study:
- To measure AM and FM detection thresholds in young and older normal-hearing listeners, and older hearing-impaired listeners.
- To assess the impact of superimposed interfering modulation (AM or FM) on detection thresholds.
- To evaluate the role of age and hearing loss in modulating these effects and to test predictive models.
Main Methods:
- Participants: Young normal-hearing, older normal-hearing, and older hearing-impaired listeners.
- Stimuli: 500-Hz carrier frequency, 5-Hz modulation rate, with superimposed AM and FM.
- Procedure: Measurement of AM and FM detection thresholds with and without interfering modulation.
Main Results:
- Both AM and FM detection thresholds were elevated when interfering modulation was present across all listener groups.
- AM detection was largely unaffected by age or hearing loss, even with interfering FM.
- FM detection was negatively impacted by aging, with a trend for hearing loss to further degrade performance in the presence of AM.
Conclusions:
- Aging significantly impairs FM detection, and hearing loss may exacerbate this impairment when AM is present.
- Normal-hearing listeners likely utilize temporal fine-structure cues for FM detection, beyond envelope cues.
- Current models can predict interfering effects only for hearing-impaired listeners, suggesting different processing strategies in normal-hearing individuals.
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