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Semi-Automated Analysis of Peak Amplitude and Latency for Auditory Brainstem Response Waveforms Using R
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Iterated rippled noise discrimination at long durations.

William A Yost1

  • 1Speech and Hearing Science, Arizona State University, Tempe, AZ 85287-0102, USA. william.yost@asu.edu

The Journal of the Acoustical Society of America
|September 11, 2009
PubMed
Summary

Listener discrimination of iterated rippled noise (IRN) improves with longer stimulus durations. Even when repetition pitch strength is controlled, longer IRN stimuli enhance perception.

Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Signal processing

Background:

  • Iterated rippled noise (IRN) stimuli are used to study auditory perception.
  • The strength of repetition pitch in IRN is related to the number of iterations.
  • Previous studies showed poor discrimination of short IRN stimuli (<500 ms) with matched autocorrelation peak heights.

Purpose of the Study:

  • To investigate the effect of stimulus duration on the discrimination of IRN stimuli.
  • To determine if longer durations improve discrimination when repetition pitch strength is controlled.

Main Methods:

  • Listeners performed discrimination tasks with IRN stimuli varying in duration (100-2000 ms).
  • The number of iterations determined the difference between IRN stimuli.

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  • Autocorrelation function peak height was controlled in some conditions.

    • Main Results:

    • Discrimination performance improved significantly with increased stimulus duration.
    • This improvement occurred even when the first peak of the autocorrelation function was matched.
    • Longer durations (>=1000 ms) were particularly effective.

    Conclusions:

    • Stimulus duration is a critical factor in discriminating IRN stimuli.
    • Future research on IRN discrimination should utilize longer durations (>=1 s).
    • Controlled repetition pitch strength does not eliminate the duration effect on IRN discrimination.