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Related Experiment Videos

The mid-level hump at 2 kHz.

Lance Nizami1, Jason F Reimer, Walt Jesteadt

  • 1Center for Hearing Research, Boys Town National Research Hospital, Omaha, Nebraska 68131, USA. nizami@boystown.org

The Journal of the Acoustical Society of America
|August 21, 2002
PubMed
Summary
This summary is machine-generated.

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Shortening brief auditory tones disrupts the intensity-difference limen (DL), creating a hump. Forward masking further inflates DLs, suggesting memory trace corruption, not just neuronal recovery.

Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Signal detection theory

Background:

  • The intensity-difference limen (DL) typically follows Weber's law.
  • Brief auditory stimuli can cause DLs to deviate, forming a "hump" phenomenon.
  • Forward masking's effect on DLs for brief tones is not fully understood.

Purpose of the Study:

  • To investigate the impact of forward masking on the intensity-difference limen (DL) for brief auditory stimuli.
  • To test the hypothesis that forward masking has minimal effect on DLs for very brief tones.
  • To evaluate competing models of auditory masking and perception.

Main Methods:

  • Determined intensity-difference limens (DLs) for a brief 2-kHz tone-pip across a range of sound pressure levels (SPL).
  • Measured DLs under conditions with and without forward masking (10 or 100 ms delays).

Related Experiment Videos

  • Compared DLs obtained with different masker intensities and delays.

    • Main Results:

    • DLs significantly inflated under all forward-masking conditions compared to no masking.
    • DLs also increased with masker intensity and varied with delay.
    • The peak sensation level (SL) of the DL hump was lower under forward masking.

    Conclusions:

    • Forward masking significantly impacts the DL for brief auditory stimuli, contrary to initial hypotheses.
    • Results do not support the neuronal-recovery-rate model.
    • Findings are consistent with the hypothesis that nonsimultaneous maskers interfere with auditory memory traces.