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Related Experiment Videos

Gap detection for similar and dissimilar gap markers.

J H Grose1, J W Hall, E Buss

  • 1Division of Otolaryngology/Head & Neck Surgery, University of North Carolina at Chapel Hill, 27599-7070, USA.

The Journal of the Acoustical Society of America
|April 28, 2001
PubMed
Summary

Temporal gap detection is impaired by perceptual dissimilarities between sound markers. Spectral differences, particularly in bandwidth, significantly elevate detection thresholds, suggesting sensitivity beyond simple spectral discontinuity.

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Area of Science:

  • Auditory Perception
  • Psychoacoustics
  • Signal Processing

Background:

  • Temporal gap detection thresholds are typically higher for markers of dissimilar frequencies compared to similar frequencies.
  • The underlying factors contributing to this threshold elevation, considering both spectral and temporal discontinuities, remain unclear.

Purpose of the Study:

  • To investigate the influence of perceptual dissimilarities on auditory gap detection.
  • To determine how spectral differences, including bandwidth, duration, and pitch, affect the ability to detect temporal gaps between auditory markers.

Main Methods:

  • Experiment 1: Measured gap detection thresholds using narrow-band gap markers of pure tones, frequency-modulated (FM) tones, and amplitude-modulated (AM) tones.
  • Experiment 2: Assessed gap detection with leading and trailing markers varying in bandwidth, duration, and pitch.

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Main Results:

  • Gap thresholds were elevated for frequency-disparate pure-tone markers compared to isofrequency markers.
  • Perceptual discontinuities within the same frequency region did not consistently elevate thresholds.
  • Gap detection worsened with differing marker bandwidths, even when spectral content was subsumed, indicating sensitivity to spectral dissimilarity.
  • Marker duration effects were dependent on marker bandwidth; pitch differences between spectrally similar markers had no impact.

Conclusions:

  • Auditory gap detection is sensitive to spectral dissimilarity between markers, not solely spectral discontinuity.
  • Bandwidth differences between auditory markers significantly impair temporal gap detection.
  • Pitch differences between spectrally similar markers do not affect gap detection thresholds.