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Related Experiment Video

Updated: Jun 25, 2026

Infant Auditory Processing and Event-related Brain Oscillations

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.

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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.