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Temporal interactions between pure tones and amplitude-modulated noise.

G H Wakefield, N F Viemeister

    The Journal of the Acoustical Society of America
    |April 1, 1985
    PubMed
    Summary

    A low-frequency tone

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    Area of Science:

    • Auditory perception and psychoacoustics.

    Background:

    • The interaction between auditory stimuli at different frequencies is complex.
    • Understanding temporal interactions is crucial for auditory processing.

    Purpose of the Study:

    • To investigate the auditory interaction between the temporal fine structure of a low-frequency tone and the envelope of a high-frequency waveform.
    • To quantify the effect of low-frequency stimulation on the detection thresholds of amplitude modulation in high-frequency noise.

    Main Methods:

    • Measured detection thresholds for sinusoidal amplitude modulation of high-frequency noise.
    • Varied the relative phase between the modulating tone and the high-frequency noise.
    • Determined "phase functions" at different noise and tone intensities and modulation frequencies.

    Main Results:

    • Low-frequency tones cyclically affect amplitude modulation sensitivity.
    • Modulation thresholds were significantly lower or higher depending on relative phase.
    • Observed threshold differences up to 23 dB.
    • Minimal masking of high-frequency noise by the low-frequency tone was noted.

    Conclusions:

    • Significant temporal auditory interactions occur even at large frequency separations.
    • Low-frequency auditory stimulation can powerfully modulate sensitivity to high-frequency amplitude changes.
    • These interactions are primarily temporal, with minimal spectral masking effects.

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