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Related Experiment Videos

Human auditory frequency-following responses to a missing fundamental.

J C Smith, J T Marsh, S Greenberg

    Science (New York, N.Y.)
    |August 18, 1978
    PubMed
    Summary

    The brain processes a "missing fundamental" tone and a pure tone similarly using periodic neural activity. This neural activity is key to how we perceive the missing fundamental frequency.

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    Area of Science:

    • Auditory neuroscience
    • Psychoacoustics

    Background:

    • The perception of a "missing fundamental" in complex tones is a well-known psychoacoustic phenomenon.
    • The neural basis for this perception, particularly whether it relies on specific neural encoding of the fundamental frequency, remains under investigation.

    Purpose of the Study:

    • To investigate the neural mechanisms underlying the perception of the missing fundamental.
    • To determine if the brain generates frequency-following responses (FFRs) to the missing fundamental frequency.

    Main Methods:

    • Evoked 365-hertz far-field frequency-following responses (FFRs) in participants.
    • Presented both a pure 365-hertz tone and a complex tone with a missing fundamental at 365 hertz.
    • Used narrow-band masking noise centered at 365 hertz to selectively disrupt neural processing at that frequency.

    Main Results:

    • Both the pure tone and the complex tone with a missing fundamental elicited 365-hertz FFRs.
    • Masking noise significantly reduced FFRs to the pure tone.
    • Crucially, the masking noise did not attenuate the FFRs evoked by the complex tone with the missing fundamental.

    Conclusions:

    • The findings support the hypothesis that the perception of a missing fundamental is underpinned by periodic neural activity.
    • This suggests that the auditory system actively generates neural representations of the fundamental frequency even when it is not physically present in the acoustic signal.

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