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Sensitivity to Frequency Modulation is Limited Centrally.

Kelly L Whiteford1, Andrew J Oxenham2

  • 1Department of Psychology, University of Minnesota, Minneapolis, Minnesota 55455 whit1945@umn.edu.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|April 7, 2023
PubMed
Summary
This summary is machine-generated.

Human sensitivity to frequency modulation (FM) is not limited by peripheral auditory nerve activity, as previously thought. Instead, central processing of fundamental frequency (F0), or pitch, better explains FM perception patterns.

Keywords:
auditory perceptionfrequency modulationpitchplace code

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Human Perception

Background:

  • Natural sounds feature amplitude and frequency modulations crucial for their characteristics.
  • Humans exhibit heightened sensitivity to slow frequency modulation (FM) at low carrier frequencies, common in speech and music.
  • This sensitivity was traditionally attributed to precise phase locking in the auditory nerve.

Purpose of the Study:

  • To investigate whether human FM perception is limited by peripheral temporal coding or central pitch processing.
  • To test the long-standing theory linking FM sensitivity to auditory nerve phase locking.

Main Methods:

  • Measured FM detection in humans using harmonic complex tones.
  • Utilized tones with a fundamental frequency (F0) in the musical range but high-frequency harmonics (>8 kHz), exceeding phase-locking limits.
  • Compared sensitivity to slow vs. fast FM rates and frequency modulation (FM) vs. amplitude modulation (AM).

Main Results:

  • Listeners showed greater sensitivity to slow FM rates, even when auditory nerve phase locking was not possible.
  • Amplitude modulation (AM) sensitivity remained higher at faster rates, irrespective of carrier frequency.
  • FM perception patterns previously explained by peripheral limits were better accounted for by central F0 processing.

Conclusions:

  • Human FM sensitivity is not constrained by peripheral encoding of temporal fine structure (TFS).
  • Central processing of fundamental frequency (F0), or pitch, imposes limitations on FM detection.
  • Findings suggest a unified code for FM detection influenced by central processing constraints.