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Infant Auditory Processing and Event-related Brain Oscillations
Published on: July 1, 2015
Age-related differences in the temporal modulation transfer function with pure-tone carriers
Ning-ji He1, John H Mills, Jayne B Ahlstrom
1Department of Otolaryngology-Head and Neck Surgery, Medical University of South Carolina, MSC 550, Charleston, South Carolina 29425-5500, USA.
The Journal of the Acoustical Society of America
|February 12, 2009
Summary
Older adults show reduced temporal resolution in processing amplitude modulation (AM), impacting their ability to detect faster envelope fluctuations compared to younger adults.
Area of Science:
- Auditory Neuroscience
- Psychoacoustics
- Gerontology
Background:
- Auditory perception relies on processing temporal and spectral cues.
- Age-related changes in hearing can affect the processing of complex auditory signals.
- Amplitude modulation (AM) detection is crucial for understanding speech and other complex sounds.
Purpose of the Study:
- To investigate age-related differences in the detection of amplitude modulation (AM).
- To examine how temporal resolution for auditory envelope fluctuations changes with age.
- To compare AM detection performance between younger and older adults across different carrier and modulation frequencies.
Main Methods:
- Participants: Younger and older adults with normal hearing.
- Task: Detection of amplitude modulation (AM) on 500 Hz and 4000 Hz tonal carriers.
- Procedure: Measured AM detection thresholds as a function of modulation frequency to determine temporal modulation transfer functions (TMTFs).
Main Results:
- The transition frequency, where AM sensitivity increases, was similar across age groups.
- Younger adults showed stable AM detection at low modulation frequencies, with thresholds increasing later.
- Older adults exhibited continuously increasing AM detection thresholds with modulation frequency, indicating poorer temporal resolution.
Conclusions:
- Significant age-related declines in temporal resolution for faster envelope fluctuations were observed.
- Age-related differences in AM detection were more pronounced when temporal cues were critical.
- Findings suggest a general age-related decline in neural response synchronization to auditory stimuli.
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