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Related Experiment Videos

Pitch matches between unresolved complex tones differing by a single interpulse interval.

C J Plack1, L J White

  • 1Department of Psychology, University of Essex, Wivenhoe Park, Colchester, England.

The Journal of the Acoustical Society of America
|August 24, 2000
PubMed
Summary
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Temporal discontinuities in complex tones significantly alter pitch perception, especially with no gap. This suggests pitch mechanisms integrate information over time but reset with brief interruptions.

Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Perception Science

Background:

  • Pitch perception is complex, influenced by harmonic content and temporal processing.
  • Understanding how the auditory system integrates acoustic information over time is crucial for explaining pitch perception.

Purpose of the Study:

  • To investigate the role of temporal discontinuities and interpulse intervals (IPIs) in pitch perception of complex tones.
  • To determine if pitch mechanisms integrate information across brief gaps or reset their processing.

Main Methods:

  • Complex tones with unresolved harmonics (F0 250 Hz, filtered 5500-7500 Hz) were presented in two bursts.
  • The interpulse interval (IPI) across a gap (0, 4, or 8 ms) was manipulated by envelope phase shifts.
  • Pitch matches were obtained by adjusting the fundamental frequency (F0) of a comparison tone.

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Main Results:

  • Significant pitch shifts occurred with IPI variations when there was no gap between bursts.
  • Minimal pitch shifts were observed for gaps of 4 or 8 ms, indicating reduced sensitivity to IPI changes.
  • Some conditions showed pitch shifts when the gap increased from 0 to 4 ms, suggesting integration limits.

Conclusions:

  • The auditory system integrates information across tone bursts for pitch perception, but this integration is sensitive to temporal discontinuities.
  • A pitch mechanism with a long integration time that resets in response to temporal discontinuities is proposed.
  • An 8 ms IPI may be sufficient to reset pitch processing for a 250 Hz fundamental frequency.