Noise schemas aid hearing in noise
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View abstract on PubMed
Summary
This summary is machine-generated.Human hearing effectively processes sounds in noisy environments. This study reveals that the auditory system builds internal "noise schemas" to separate sounds, rather than just suppressing noise.
Area Of Science
- Auditory Neuroscience
- Psychoacoustics
- Cognitive Science
Background
- Human hearing exhibits remarkable robustness to background noise, a phenomenon not fully explained by current models.
- Existing theories suggest adaptation to stable sound components, potentially suppressing noise, but this conflicts with noise's informational value.
Purpose Of The Study
- To investigate whether internal models of noise structure, rather than simple adaptation, mediate auditory noise robustness.
- To explore how the auditory system separates relevant sounds from background noise.
Main Methods
- Participants performed auditory tasks (detection, recognition, localization) with foreground sounds embedded in real-world background noise.
- Noise characteristics were manipulated, including timing of foreground sounds, noise interruptions, and recurring noise patterns.
Main Results
- Auditory performance improved for sounds presented later in a noise excerpt, with gains over the first second of exposure.
- Performance remained robust to noise interruptions and was enhanced by intermittently recurring backgrounds.
- A reduced benefit for later sounds in recurring noises suggested a maintained internal noise representation.
Conclusions
- Auditory noise robustness is supported by rapidly estimated, stored, and updated internal models of noise structure, termed "noise schemas."
- These "noise schemas" facilitate the separation of concurrent sounds by predicting and modeling background noise.
- Findings challenge purely adaptation-based models and highlight the role of predictive internal representations in auditory perception.
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