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Sequential streaming and effective level differences due to phase-spectrum manipulations.

Thomas H Stainsby1, Brian C J Moore, Peter J Medland

  • 1Department of Experimental Psychology, University of Cambridge, Downing Street, Cambridge CB2 3EB, United Kingdom. ths22@cam.ac.uk

The Journal of the Acoustical Society of America
|April 23, 2004
PubMed
Summary
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Auditory stream segregation can occur due to phase differences. Random-phase stimuli caused greater masking than cosine or alternating phases, suggesting excitation level differences play a role.

Area of Science:

  • Psychoacoustics
  • Auditory perception
  • Signal processing

Background:

  • Sequential stream segregation is the perceptual separation of auditory streams.
  • Previous research showed phase spectrum differences can cause stream segregation.
  • The role of effective excitation level in phase-induced segregation was unclear.

Discussion:

  • Random-phase stimuli created significantly more masking than cosine or alternating-phase stimuli.
  • This masking difference equated to a 12.6 dB higher effective excitation level for random-phase stimuli.
  • Stream segregation increased with a 5 dB level difference in successive stimuli.

Key Insights:

  • Phase spectrum differences contribute to auditory stream segregation.
  • Effective excitation level differences account for some, but not all, phase-induced segregation.

Related Experiment Videos

  • Cosine- and alternating-phase stimuli did not differ in masking, indicating other factors are involved.

    • Outlook:

    • Further research is needed to fully understand the mechanisms of phase-dependent stream segregation.
    • Investigating other stimulus parameters may reveal additional factors influencing auditory stream segregation.
    • Exploring the neural correlates of phase processing in the auditory system could provide deeper insights.