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Related Experiment Videos

Counterintuitive reversals in lateralization using rectangularly modulated noise.

E R Hafter1, B R Shelton

  • 1Department of Psychology, University of California, Berkeley 94720.

The Journal of the Acoustical Society of America
|October 1, 1991
PubMed
Summary
This summary is machine-generated.

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This study explored how listeners perceive sound timing. Unexpected lateralization shifts occurred, suggesting the fine structure of sound, particularly low frequencies, is crucial for accurate auditory perception.

Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Signal Processing

Background:

  • Interaural time differences (ITDs) are critical for sound localization.
  • Perception of complex sounds, like pulse-modulated noise, involves intricate processing of temporal cues.

Purpose of the Study:

  • To investigate the role of stimulus fine structure in auditory lateralization.
  • To examine how carrier frequency and pulse width affect the perception of interaural delays.
  • To identify the acoustic features influencing unexpected lateralization shifts.

Main Methods:

  • Listeners detected interaural delays in pulse-modulated noise with varying center frequencies (550-9600 Hz) and modulation parameters.
  • Stimuli bandwidth and spectral components were manipulated to assess their impact on lateralization.

Related Experiment Videos

  • A cross-correlation model was employed to analyze the observed phenomena.

    • Main Results:

    • Unexpected lateralization shifts were observed for specific center frequency and pulse width combinations.
    • Lateralization oscillated between leading and lagging sides, dependent on carrier cycles within pulses.
    • Low-frequency spectral information was found to be essential for these observed oscillations.

    Conclusions:

    • The fine structure of auditory stimuli, particularly low-frequency components, significantly influences perceived sound location.
    • Auditory models must account for both positive and negative peaks in cross-correlation functions to explain complex lateralization effects.
    • These findings advance our understanding of auditory temporal processing and sound localization mechanisms.