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Discrimination of changes in spatial configuration for multiple, simultaneously presented sounds.

William A Yost1, M Torben Pastore1, Yi Zhou2

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Human listeners can discern changes in sound source locations. Performance decreases when more than two consonant-vowel (CV) sounds are simultaneously presented from different spatial configurations.

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Area of Science:

  • Auditory Perception
  • Psychoacoustics
  • Spatial Hearing

Background:

  • Understanding how humans perceive sound source configurations is crucial for fields like audio engineering and human-computer interaction.
  • Previous research has explored spatial hearing with fewer sound sources, but complex multi-source scenarios remain less understood.

Purpose of the Study:

  • To investigate listeners' ability to discriminate spatial configurations of multiple simultaneous consonant-vowel (CV) speech sounds.
  • To determine how the number of sound sources and their spatial arrangement affect auditory perception.

Main Methods:

  • Listeners performed same-different judgments on spatial configurations of 2-8 simultaneous CV stimuli from different talkers.
  • A second experiment involved identifying the direction of sound source rotation.
  • Varied parameters included the number of CVs, spatial layout, and talker similarity.

Main Results:

  • Listener performance in discriminating spatial configurations declined significantly as the number of sound sources increased beyond two.
  • Both experiments showed a decrease in accuracy with a higher number of simultaneous sound sources.

Conclusions:

  • The human auditory system has limitations in processing and discriminating the spatial configurations of multiple simultaneous sound sources.
  • Spatial auditory scene analysis becomes more challenging with an increased number of concurrent auditory objects.