Double-pass consistency for amplitude- and frequency-modulation detection in normal-hearing listeners
Sarah Attia1, Andrew King1, Léo Varnet1
1Laboratoire des systèmes perceptifs (CNRS 8248), Département d'études cognitives, Ecole normale supérieure, Université Paris Sciences et Lettres, 29 rue d'Ulm, 75005 Paris, France.
The Journal of the Acoustical Society of America
|December 2, 2021
Summary
This study investigated auditory perception of amplitude modulation (AM) and frequency modulation (FM). Results suggest different internal noise sources affect AM and FM detection at low audio frequencies.
Area of Science:
- Auditory Neuroscience
- Psychoacoustics
- Signal Processing
Background:
- Amplitude modulation (AM) and frequency modulation (FM) are key auditory cues.
- Understanding AM and FM perception aids in unifying auditory processing models.
- Previous research suggests potential overlap in AM and FM encoding.
Purpose of the Study:
- To investigate if FM perception can be unified with AM perception.
- To compare response consistency and performance for AM and FM detection.
- To model auditory processing of AM and FM using a computational approach.
Main Methods:
- Normal-hearing participants completed a double-pass, forced-choice detection task.
- Sinusoidal AM and FM stimuli (2 and 20 Hz) on a 500-Hz carrier were presented at threshold.
- Stimuli were masked by modulation noise; response agreement and detection accuracy were measured.
Main Results:
- Different internal noise levels were needed to model AM and FM data.
- A single internal noise level explained both 2 and 20 Hz AM data.
- Two internal noise levels were required for FM detection across frequencies, increasing with masker level.
Conclusions:
- AM and FM detection at low audio frequencies likely involve distinct internal variability sources.
- The findings challenge a completely unified model for AM and FM perception.
- Internal noise levels are influenced by masker characteristics in auditory processing.
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