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Sensitivity to Envelope Interaural Time Differences at High Modulation Rates.

Jessica J M Monaghan1, Stefan Bleeck2, David McAlpine3

  • 1Institute of Sound and Vibration Research, University of Southampton, UK jessica.monaghan@gmail.com.

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|January 2, 2016
PubMed
Summary
This summary is machine-generated.

Sensitivity to interaural time differences (ITDs) in high-frequency sounds is better than previously thought. Well-trained listeners can discriminate ITDs at higher modulation rates than expected, especially with 4-kHz carriers.

Keywords:
interaural time differencesrate-limitstransposed envelopes

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Signal Processing

Background:

  • Interaural time differences (ITDs) are crucial for sound localization.
  • Sensitivity to ITDs in low-frequency sounds is well-established.
  • Previous research suggested limitations in processing ITDs in high-frequency sound envelopes.

Purpose of the Study:

  • To investigate listeners' sensitivity to ITDs in high-frequency modulated tones.
  • To determine the upper limits of modulation rate and carrier frequency for ITD discrimination.
  • To re-evaluate the presence and characteristics of a low-pass filter in envelope ITD processing.

Main Methods:

  • Assessed ITD discrimination thresholds in pure tones and modulated high-frequency tones.
  • Measured performance as a function of modulation rate and carrier frequency.
  • Utilized well-trained listeners for precise threshold determination.

Main Results:

  • Some listeners achieved high ITD discrimination performance at modulation rates exceeding 500 Hz for 4-kHz carriers.
  • Thresholds were obtained up to 800 Hz for one listener.
  • The maximum usable modulation rate decreased as carrier frequency increased, with a 600 Hz limit at 10 kHz.

Conclusions:

  • The upper limit of sensitivity to ITDs in high-frequency modulated sound envelopes is higher than previously assumed.
  • Carrier frequency significantly influences the processing of envelope ITDs.
  • Findings challenge the notion of a strict low-pass filter and suggest more complex processing mechanisms.