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Modulation masking in listeners with sensorineural hearing loss
C Lorenzi1, C Micheyl, F Berthommier
1Laboratoire PCH, Département de Psychologie Cognitive, Université Lumière Lyon II Bron, France.
Journal of Speech, Language, and Hearing Research : JSLHR
|February 1, 1997
Summary
This study investigated amplitude-modulation (AM) masking in individuals with normal hearing and hearing loss. Findings suggest cochlear damage may impact performance in modulation masking tasks.
Area of Science:
- Auditory perception
- Psychoacoustics
- Hearing science
Background:
- Amplitude-modulation (AM) masking is crucial for understanding auditory processing.
- Previous research has explored AM masking in normal-hearing listeners, but less is known about its effects in individuals with hearing loss.
Purpose of the Study:
- To compare AM masking patterns in listeners with normal hearing and those with sensorineural hearing loss.
- To investigate how cochlear damage influences the detection of modulated signals.
Main Methods:
- Measured the detection of sinusoidal AM on a white noise carrier.
- Varied the frequency of a masking sinusoidal AM applied to the same carrier.
- Tested four normal-hearing listeners and three listeners with varying degrees of hearing loss.
Main Results:
- Normal-hearing listeners showed broad bandpass input filter patterns with primary and secondary masking peaks.
- Listeners with hearing loss exhibited varied results: one showed a broadly tuned pattern without a secondary peak, while others lacked a main masking peak and had elevated thresholds at low masker frequencies.
- Unmasked modulation thresholds were comparable between normal-hearing and hearing-impaired listeners.
Conclusions:
- Cochlear damage appears to affect performance in modulation masking tasks.
- Results indicate potential alterations in auditory filtering or processing in individuals with hearing loss.
- Further research is needed to fully elucidate the mechanisms underlying these effects.