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Amplitude modulation reduces loudness adaptation to high-frequency tones
Dwight P Wynne1, Sahara E George1, Fan-Gang Zeng1
1Center for Hearing Research, University of California, Irvine, 110 Medical Science E, Irvine, California 92697, USA.
The Journal of the Acoustical Society of America
|August 3, 2015
Summary
Neural synchronization is critical for maintaining loudness perception over time. Amplitude modulation significantly reduced loudness adaptation, preserving perceived loudness compared to unmodulated tones.
Area of Science:
- Auditory Neuroscience
- Psychoacoustics
- Signal Processing
Background:
- Long-term loudness perception is influenced by auditory nerve fiber distribution and temporal firing patterns.
- Understanding the relative contributions of these factors is crucial for auditory models.
Purpose of the Study:
- To investigate the role of neural synchronization versus spatial excitation in long-term loudness perception.
- To quantify the effect of amplitude modulation on loudness adaptation.
Main Methods:
- Measuring loudness adaptation to 12-kHz tones with varying amplitude modulation (0-100% depth, 4-100 Hz frequency).
- Subjects (normal-hearing) estimated loudness of stimuli presented 15 dB above threshold.
- Stimuli duration was 180 seconds, with loudness estimations every 30 seconds.
Main Results:
- Unmodulated tones showed significant loudness adaptation (80% reduction after 180s).
- Amplitude modulation reduced adaptation, with 100% modulation maintaining 55%-80% of initial loudness.
- Low-frequency amplitude modulation minimally affected spectral cues.
Conclusions:
- Neural synchronization, driven by temporal firing patterns, is critical for sustained loudness perception.
- Spatial distribution cues play a lesser role in long-term loudness compared to neural timing.
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