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Probing temporal modulation detection in white noise using intrinsic envelope fluctuations: A reverse-correlation

Léo Varnet1, Christian Lorenzi1

  • 1Laboratoire des Systèmes Perceptifs, Département d'Études Cognitives, École Normale Supérieure, Université Paris Sciences & Lettres, Centre National de la Recherche Scientifique, 75005 Paris, France.

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Summary
This summary is machine-generated.

Human listeners can detect amplitude modulations (AM) in sound, but their performance is affected by noise. This study reveals listeners exhibit phase uncertainty when processing envelope fluctuations, impacting sound perception.

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Signal Processing

Background:

  • Stationary noise impairs sound perception by masking amplitude modulations (AM).
  • Intrinsic envelope fluctuations from cochlear filtering contribute to this masking effect.
  • Understanding AM detection strategies is crucial for auditory perception research.

Purpose of the Study:

  • To investigate human listeners' strategies for detecting amplitude modulation (AM) in the presence of noise.
  • To probe the role of intrinsic envelope fluctuations in AM detection using reverse correlation analysis.
  • To compare human performance with computational models of auditory processing.

Main Methods:

  • Eight normal-hearing listeners performed a yes-no task to detect a 4-Hz sinusoidal AM target on a 1-kHz carrier.
  • Stimuli were presented within a white-noise masker.
  • Reverse correlation analysis was used to compute psychophysical kernels, revealing stimulus aspects influencing listener responses.

Main Results:

  • Psychophysical kernels indicated listeners could track AM peaks, mirroring computational model behavior.
  • However, human kernels showed significant temporal decay and phase shift compared to ideal templates.
  • Simulated data supported the interpretation of phase uncertainty in processing envelope fluctuations.

Conclusions:

  • Human listeners exhibit phase uncertainty when processing intrinsic envelope fluctuations during AM detection.
  • This uncertainty impacts the tracking of temporal envelope features, affecting overall sound perception.
  • Findings provide insights into the mechanisms underlying auditory signal processing in noisy environments.