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The relationship between precursor level and the temporal effect.

Elizabeth A Strickland1

  • 1Department of Speech, Language, and Hearing Sciences, Purdue University, West Lafayette, Indiana 47907-2038, USA. estrick@purdue.edu

The Journal of the Acoustical Society of America
|February 6, 2008
PubMed
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Temporal masking effects, related to cochlear gain, were studied by varying precursor levels. Results suggest a decrease in cochlear gain or suppression, potentially linked to the medial olivocochlear reflex.

Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics

Background:

  • Temporal effects in auditory masking may indicate changes in cochlear gain.
  • Previous studies used masker onset paradigms to investigate these temporal effects.

Purpose of the Study:

  • To investigate the influence of precursor level on temporal masking effects.
  • To determine if these effects are related to cochlear gain or suppression mechanisms.

Main Methods:

  • A 10-ms, 4-kHz tone signal was used with a 200-ms masker.
  • A fixed-level precursor (205 ms) preceded the masker, with or without a notch.
  • Input-output functions were estimated by varying masker level relative to signal level.

Main Results:

  • A graded decrease in cochlear gain was observed without a masker/precursor notch.

Related Experiment Videos

  • A graded decrease in suppression was found with a wide notch.
  • These findings were dependent on the precursor level.

    • Conclusions:

    • The results support a model of graded cochlear gain reduction in the absence of spectral notches.
    • Suppression mechanisms appear to be involved when spectral notches are present.
    • These temporal masking phenomena may be mediated by the medial olivocochlear reflex.