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Related Experiment Videos

Phase effects in masking by harmonic complexes in birds.

Amanda M Lauer1, Robert J Dooling, Marjorie R Leek

  • 1Department of Psychology, University of Maryland, College Park, Maryland 20742, USA. alauer@psyc.umd.edu

The Journal of the Acoustical Society of America
|March 9, 2006
PubMed
Summary

Human hearing shows phase-dependent masking differences, unlike birds. This study reveals birds have reduced cochlear delay, likely due to shorter basilar epithelia, impacting auditory processing.

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Area of Science:

  • Auditory Neuroscience
  • Comparative Psychoacoustics
  • Bioacoustics

Background:

  • Masking by harmonic complexes is influenced by masker frequency and phase spectrum.
  • Humans exhibit greater masking with negative Schroeder phases compared to positive phases, attributed to basilar membrane interactions.
  • Birds show similar masking for positive and negative Schroeder phases, suggesting a different basilar papilla phase characteristic.

Purpose of the Study:

  • To investigate the role of phase characteristics in auditory masking across species.
  • To evaluate the hypothesis of a changing phase characteristic along the avian basilar papilla.
  • To compare cochlear delay in humans and birds using systematically varied phase gradients.

Main Methods:

  • Systematically altering the Schroeder algorithm to vary the rate of phase change across masker bandwidth.

Related Experiment Videos

  • Presenting harmonic complexes with different phase spectra (positive, negative, cosine) to human and avian subjects.
  • Measuring tone detection thresholds in the presence of harmonic complex maskers.

    • Main Results:

    • Human masking was minimized with positive phase gradients, consistent with previous findings.
    • Avian masking was minimized with a shallow negative phase gradient, differing from humans.
    • Masking patterns in birds suggest a reduced cochlear delay compared to humans.

    Conclusions:

    • The findings suggest a reduced cochlear delay in birds compared to humans.
    • This difference is likely related to the shorter basilar epithelia in birds.
    • Auditory processing and phase sensitivity vary significantly between human and avian auditory systems.