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Forward masking of spectrotemporal modulation detection.

Christopher Conroy1, Andrew J Byrne1, Gerald Kidd1

  • 1Department of Speech, Language & Hearing Sciences and Hearing Research Center, Boston University, 635 Commonwealth Avenue, Boston, Massachusetts 02215, USA.

The Journal of the Acoustical Society of America
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PubMed
Summary

This study investigated specialized auditory coding for spectrotemporal modulations (STMs). Findings suggest the auditory system uses specific mechanisms sensitive to STM sweep direction for enhanced detection.

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Signal Processing

Background:

  • The auditory system may possess specialized mechanisms for coding spectrotemporal modulations (STMs).
  • These hypothetical mechanisms might be tuned to specific spectral modulation frequencies, temporal modulation frequencies, and sweep directions.

Purpose of the Study:

  • To find evidence for specialized auditory coding mechanisms for STMs.
  • To investigate the role of sweep direction selectivity in STM detection.

Main Methods:

  • A psychophysical forward masking paradigm was employed.
  • The detectability of upward sweeping STMs (target) was measured.
  • Four types of modulated maskers were used, varying in spectral/temporal modulation frequency and sweep direction relative to the target.

Main Results:

  • Greatest forward masking occurred with a masker having identical spectral and temporal modulation frequencies and the same upward sweep direction.
  • Intermediate masking was observed with a masker of opposite (downward) sweep direction.
  • Negligible masking was found with maskers differing in either spectral or temporal modulation frequency but not sweep direction.

Conclusions:

  • The results support the existence of STM-specific coding mechanisms in the auditory system.
  • These mechanisms appear to exhibit selectivity for the direction of spectrotemporal modulation sweep.