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Related Experiment Videos

Developmental changes in the precedence effect: estimates of minimum audible angle

R Y Litovsky1

  • 1Psychology Department, University of Massachusetts, Amherst 01003, USA.

The Journal of the Acoustical Society of America
|September 25, 1997
PubMed
Summary

Children

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Area of Science:

  • Auditory perception
  • Developmental psychology
  • Psychoacoustics

Background:

  • The precedence effect is an auditory phenomenon where the perceived location of a sound is dominated by the first arriving source.
  • While adults can extract directional cues from lagging sound sources, developmental studies on this ability are limited by stimulus configurations.
  • Existing research suggests the ability to localize sound sources changes with development, but optimal measurement conditions are not well-established.

Purpose of the Study:

  • To investigate the development of sound localization abilities in children using the precedence effect.
  • To compare performance in single-source localization versus two precedence effect conditions (lead and lag discrimination).
  • To identify optimal stimulus conditions for measuring sound localization in young children.

Main Methods:

  • Utilized the minimum audible angle (MAA) task in the azimuthal plane to assess sound localization.
  • Compared performance across three conditions: single-source, lead discrimination, and lag discrimination.
  • Tested participants aged 18 months, 5 years, and adults under optimized precedence effect conditions.

Main Results:

  • Significant improvements in minimum audible angle (MAA) were observed with increasing age, particularly in precedence conditions.
  • All age groups performed best in the single-source condition, followed by lead discrimination, and then lag discrimination.
  • Children demonstrated developing abilities in sound source discrimination under precedence effect paradigms.

Conclusions:

  • Sound localization ability, particularly under the precedence effect, significantly improves from infancy through adulthood.
  • The study identified effective methods for assessing developmental changes in auditory spatial perception.
  • Findings highlight age-related differences in processing complex auditory spatial information, with simpler conditions yielding better performance.

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