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Modulation masking produced by a low-frequency pure tone.

Josef Schlittenlacher1, Ji Xia Lim2, Jemima Lawson2

  • 1Manchester Centre for Audiology and Deafness, Division for Human Communication, Development and Hearing, University of Manchester, Manchester, UK; Cambridge Hearing Group, Department of Psychology, University of Cambridge, Cambridge, UK; Department of Speech, Hearing and Phonetic Sciences, University College London, London, UK.

Hearing Research
|August 23, 2022
PubMed
Summary

A low-frequency tone can interfere with hearing high-frequency sounds. This study found that outer hair cells (OHCs) are not the primary cause, suggesting inner hair cells are affected instead.

Keywords:
Amplitude modulationEnvelope processingModulation interferenceModulation maskingRemote masking

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics

Background:

  • Low-frequency sounds can influence the perception of high-frequency auditory stimuli.
  • Amplitude modulation (AM) detection thresholds are sensitive to masker characteristics.

Purpose of the Study:

  • To investigate the effect of an intense low-frequency tone on the detection of AM applied to a high-frequency carrier.
  • To determine the role of outer hair cells (OHCs) in this phenomenon.

Main Methods:

  • Measured AM detection thresholds for a 3000-Hz carrier in the presence of a 50-Hz tone.
  • Varied AM frequency, sensation level (SL), and participant hearing status (normal vs. impaired).
  • Analyzed AM detection thresholds as a function of phase difference (Δφ) between the AM and the low-frequency tone.

Main Results:

  • The 50-Hz tone increased AM detection thresholds, with effects varying with AM frequency.
  • AM detection thresholds showed a phase-dependent pattern, with minima at Δφ = 90° and maxima at Δφ = 270°.
  • Similar patterns were observed across different SLs and between normal-hearing and hearing-impaired participants, suggesting a limited role for OHCs.

Conclusions:

  • The observed effects of a low-frequency tone on AM detection are likely mediated by inner hair cells, not outer hair cells.
  • Low-frequency tones may bias the responses of high-frequency tuned inner hair cells, impacting perception.