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Temporary threshold shift, loudness, and auditory evoked potentials.

M C Botte, H A Beagley, R Chocholle

    Clinical Otolaryngology and Allied Sciences
    |February 1, 1979
    PubMed
    Summary
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    Temporary threshold shift (TTS) recovery is faster than temporary loudness shift (TLS) recovery. N1-P2 amplitude recovery is less orderly but follows TTS trends, especially at 40dB SL.

    Area of Science:

    • Auditory Neuroscience
    • Psychoacoustics
    • Audiology

    Background:

    • Temporary threshold shift (TTS) and temporary loudness shift (TLS) are common auditory phenomena.
    • The N1-P2 vertex potential reflects auditory processing and has been linked to loudness perception.

    Purpose of the Study:

    • To investigate the recovery patterns of TTS, TLS, and N1-P2 amplitude after auditory stimulation.
    • To explore the relationship between N1-P2 amplitude recovery and loudness perception.

    Main Methods:

    • TTS was induced using a 1000 Hz pure tone (20 dB).
    • Measurements of TTS, TLS (at 20, 40, 60 dB SL in the contralateral ear), and N1-P2 amplitude were taken at 1500 Hz.
    • Recovery curves for all measures were plotted.

    Related Experiment Videos

    Main Results:

    • Both TTS and TLS showed orderly recovery, with TTS recovery being significantly faster.
    • N1-P2 amplitude recovery was less orderly but generally mirrored TTS recovery.
    • At 40 dB SL, N1-P2 amplitude recovery became more orderly and closely followed TTS recovery.

    Conclusions:

    • The recovery rate of TTS is more rapid than that of TLS.
    • The relationship between N1-P2 amplitude and loudness growth appears to be indirect.
    • Auditory adaptation and recovery processes involve complex interactions between different physiological measures.