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Temporal fine structure sensitivity measured with pulse-spreading harmonic complexes.

Olivier Macherey¹

¹Aix-Marseille University, Centre National de la Recherche Scientifique, Centrale Méditerranée, Laboratoire de Mécanique et d'Acoustique, 4 Impasse Nikola Tesla, 13013 Marseille, France.

The Journal of the Acoustical Society of America

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Summary

This summary is machine-generated.

Normal hearing individuals can perceive pitch changes from temporal fine structure (TFS) cues. TFS sensitivity has a lower rate limit that increases with frequency, similar to melodic pitch perception.

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Area of Science:

Auditory Neuroscience
Psychoacoustics

Background:

Temporal fine structure (TFS) plays a crucial role in auditory perception.
Understanding TFS sensitivity is key to explaining pitch perception, especially with complex sounds.

Purpose of the Study:

To investigate normal hearing participants' sensitivity to TFS.
To determine the influence of frequency region and envelope rate on TFS perception.
To explore the relationship between TFS sensitivity and melodic pitch perception.

Main Methods:

Used bandpass filtered pulse-spreading harmonic complexes (PSHCs) with phase-adjusted TFS peaks.
Participants identified pitch direction (rising/falling) in two experiments.
Cochlear model simulations were employed to analyze potential processing cues.

Main Results:

Experiment 1: A specific range of envelope rates allowed identification of pitch direction changes.
Experiment 2: A lower envelope rate limit for discriminating TFS pitch changes was identified.
This limit increased with frequency and resembled the limit for melodic pitch.

Conclusions:

Normal hearing listeners can detect pitch direction from TFS cues within certain rate limits.
TFS cues remain relevant for pitch perception in high frequencies (up to 10 kHz) even with unresolved harmonics.
Findings suggest TFS contributes significantly to pitch perception across different frequency regions and sound complexities.