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Updated: Jun 18, 2026
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An Automated System for Sound Localization Testing in Hearing-Impaired Listeners
Published on: March 13, 2026
Sequential stream segregation affects localisation of diotic tones among tones with time-varying interaural time
1Kyushu University, 6-19-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan. tkawabe@psycho.kyushu-u.ac.jp
Perception
|November 17, 2009
Summary
Sequential stream segregation aids in detecting diotic tones within complex auditory scenes. Larger frequency differences between tones improved detection sensitivity and reduced response bias, suggesting auditory motion influences sound localization.
Area of Science:
- Auditory Perception
- Psychoacoustics
- Cognitive Neuroscience
Background:
- Auditory stream segregation separates complex sounds into distinct perceptual streams.
- Interaural time differences (ITDs) are crucial cues for sound localization.
- Understanding how auditory segregation interacts with localization cues is vital for complex acoustic environments.
Purpose of the Study:
- To investigate the role of sequential stream segregation in detecting diotic tones amidst auditory motion.
- To examine the influence of frequency differences and time-varying ITDs on auditory perception.
- To determine how stream segregation affects sound image localization.
Main Methods:
- Listeners were presented with repeated (DTD -) sequences containing target (diotic) and distractor (moving ITD) tones.
- Frequency differences were manipulated between target and distractor tones.
- Listener sensitivity (d') and criterion (c) for detecting diotic tones were measured.
Main Results:
- Detection sensitivity (d') for diotic tones increased with larger frequency differences.
- Response criterion (c) decreased with larger frequency differences.
- Reports of 'two streams' correlated positively with d' and negatively with c.
Conclusions:
- Sequential stream segregation enhances the detection of stationary (diotic) tones in the presence of moving distractors.
- Frequency separation between auditory streams facilitates segregation and improves detection.
- Auditory stream segregation significantly influences sound image localization in complex auditory environments.
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