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Infant Auditory Processing and Event-related Brain Oscillations
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A novel signal processing approach to auditory phantom perception.

I-Hui Hsieh1, Jia-Wei Liu2

  • 1Institute of Cognitive Neuroscience, National Central University, No.300 Jhongda Rd., Jhongli County, Taoyuan City, 32001, Taiwan. ihuihsieh@gmail.com.

Psychonomic Bulletin & Review
|August 2, 2018
PubMed
Summary
This summary is machine-generated.

Phantom tones, perceived sounds without physical presence, may originate from non-linear signal components within the ear. This study identified a novel travelling wave linked to phantom perception, offering new insights into auditory processing.

Keywords:
Cubic difference toneEmpirical mode decompositionIntrinsic mode functionsNon-linear analysisPhantom tone

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Area of Science:

  • Auditory Neuroscience
  • Acoustics
  • Signal Processing

Background:

  • Phantom tones are perceived sounds lacking physical acoustic presence, arising from complex ear-brain interactions.
  • The precise origin, whether peripheral or cortical, of these phantom percepts remains incompletely understood.
  • Existing models struggle to fully explain the generation of non-linear auditory phenomena.

Purpose of the Study:

  • To investigate the existence and characteristics of non-linear components within complex acoustic signals related to phantom tone perception.
  • To determine if these non-linear components represent an extra-aural travelling wave within the original sound.
  • To explore the spectro-temporal dynamics and predictive power of these components for phantom sound perception.

Main Methods:

  • Applied empirical mode decomposition (EMD) to analyze non-linear and non-stationary processes in two-tone complexes.
  • Extracted and analyzed an oscillatory component, identified as a travelling wave, from the original sound signal.
  • Correlated the properties of this travelling wave (velocity, phase coherence, spectral magnitude) with listener perception of phantom tones.

Main Results:

  • Identified a previously unobserved travelling wave within the original sound signal, not present in its linear spectrum.
  • Demonstrated that the wave's velocity corresponds to the perceived phantom tone frequency.
  • Showed that phase coherence of the wave's dynamics predicts discrimination sensitivity to phantom sounds.
  • Found a correlation between perceived phantom tones and the spectral magnitude of the travelling wave component.

Conclusions:

  • Phantom sounds may originate from non-linear components inherent in the original acoustic signal.
  • The identified travelling wave offers a potential physical basis for phantom tone generation within the auditory system.
  • Findings may necessitate revisions to current models of non-linear cochlear mechanics and cortical processing in phantom perception.