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Related Experiment Videos

Cross-frequency interactions in the precedence effect

B G Shinn-Cunningham1, P M Zurek, N I Durlach

  • 1Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge 02139, USA.

The Journal of the Acoustical Society of America
|July 1, 1995
PubMed
Summary
This summary is machine-generated.

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The precedence effect, crucial for sound localization, shows low-frequency sounds dominate high-frequency sounds. This suggests central auditory processing combines sound information across different frequencies.

Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Signal Processing

Background:

  • The precedence effect is a fundamental auditory phenomenon influencing sound localization.
  • Understanding how spectral differences affect the precedence effect is key to auditory perception research.
  • Previous studies indicate spectral content impacts auditory spatial awareness.

Purpose of the Study:

  • To investigate the precedence effect when leading and lagging sounds have different frequency content.
  • To determine the influence of spectral composition on the lateralization of sound stimuli.
  • To explore the role of low-frequency dominance in auditory spatial processing.

Main Methods:

  • Subjects listened to binaural noise bursts with varying onsets, frequencies, and interaural delays via headphones.

Related Experiment Videos

  • The precedence effect was quantified by measuring the independence of a matching sound's interaural delay from the lagging sound's delay.
  • Stimuli were manipulated to isolate the effects of frequency content and interaural time differences on lateralization.

    • Main Results:

    • An asymmetric frequency effect was observed: leading low-frequency bursts significantly suppressed the lateralization influence of lagging high-frequency bursts.
    • Lagging low-frequency bursts were weighted equally with leading high-frequency bursts.
    • This asymmetry stemmed from an inherent low-frequency dominance, evident even with simultaneous bursts.

    Conclusions:

    • The precedence effect demonstrates a low-frequency dominance in auditory spatial processing.
    • When low-frequency dominance is mitigated, the precedence effect operates symmetrically across frequencies.
    • Findings suggest the precedence effect originates from a central auditory processing stage integrating cross-frequency information.