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A Method to Study Adaptation to Left-Right Reversed Audition
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Published on: October 29, 2018

Onset- and offset-specific effects in interaural level difference discrimination.

G Christopher Stecker1, Andrew D Brown

  • 1Department of Speech and Hearing Sciences, University of Washington, 1417 Northeast 42nd Street, Seattle, Washington 98105, USA. cstecker@u.washington.edu

The Journal of the Acoustical Society of America
|September 18, 2012
PubMed
Summary
This summary is machine-generated.

Human listeners are most sensitive to interaural level differences (ILDs) at the beginning and end of sounds. Sensitivity is lower for ILDs presented in the middle of brief sounds, indicating uneven temporal weighting.

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Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Human hearing

Background:

  • Interaural level differences (ILDs) are crucial cues for sound localization.
  • Understanding how temporal variations in ILDs affect auditory processing is important for explaining sound perception.

Purpose of the Study:

  • To investigate the relative sensitivity of human listeners to ILDs presented at different temporal segments of brief sounds.
  • To determine if ILD sensitivity is uniform across the duration of a sound or if it favors specific temporal regions.

Main Methods:

  • Gabor clicks and click trains were used as auditory stimuli.
  • Interaural level differences (ILDs) were manipulated to favor specific temporal portions: onset, offset, both, or interior.
  • Adaptive procedures were employed to determine the threshold ILDs for each condition.

Main Results:

  • Thresholds for ILDs at sound onset or offset were similar.
  • ILDs presented at both onset and offset yielded lower thresholds compared to ILDs in the interior.
  • Sensitivity to ILDs was not uniform, with greater sensitivity observed for onset and offset portions.

Conclusions:

  • Human auditory sensitivity to interaural level differences (ILDs) is not uniform over time.
  • Onset and offset portions of brief sounds are more critical for processing ILDs than interior portions.
  • These findings suggest a temporal weighting favoring sound transitions in auditory localization mechanisms.