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  • Title: Detection of pure-tone amplitude modulation as a function of sensation level from 8 to 14 kHz.
    Author: Long GR, Cullen JK.
    Journal: Hear Res; 1986; 24(2):163-8. PubMed ID: 3771378.
    Abstract:
    Amplitude modulation detection thresholds were obtained for pure-tone stimuli of 8, 10, 12 and 14 kHz at 5 dB intensity increments from 10 to 65 dB sensation level. Performance at 8 and 10 kHz was a non-monotonic function of sensation level for all four subjects with the largest difference limen measured near 30 dB sensation level and optimal performance at the highest sensation level (60 dB). Weber fractions at 12 and 14 kHz appear dependent on each subject's high frequency hearing profile; i.e., the difference limens remain high and either increase or remain essentially constant at high sensation levels only when the frequencies tested are near a particular subject's upper limit of hearing.
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