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Range effects in the identification of lateral position
1Boston University, Massachusetts 02215.
The Journal of the Acoustical Society of America
|September 1, 1989
Summary
The range of sounds presented impacts our ability to detect subtle differences in sound timing and loudness. A wider range of stimuli makes it harder to identify specific interaural differences.
Area of Science:
- Auditory perception
- Psychoacoustics
- Signal detection theory
Background:
- Accurate identification of interaural time differences (ITDs) and interaural amplitude differences (IADs) is crucial for sound localization.
- Previous research has explored various factors influencing ITD and IAD perception, but the specific impact of stimulus range remains less understood.
Purpose of the Study:
- To investigate how the range of presented stimuli affects the performance in identifying interaural time and amplitude differences.
- To compare identification accuracy across different stimulus set ranges: large range (LR), small-range center (SRC), and small-range side (SRS).
Main Methods:
- Experiments were conducted using three distinct stimulus sets with varying ranges of interaural differences.
- Participants were tasked with identifying specific interaural time and amplitude differences within each stimulus set.
- Performance metrics, such as resolution, were analyzed to quantify identification accuracy across conditions.
Main Results:
- Identification performance, specifically resolution, was significantly worse for the large range (LR) stimulus set compared to the small-range center (SRC) and small-range side (SRS) sets.
- These findings indicate that the overall range of interaural differences presented influences the ability to discern specific differences.
Conclusions:
- The total range of interaural differences in a stimulus set is a critical factor affecting the precision of auditory localization cues.
- A broader stimulus range can impair the ability to accurately identify subtle variations in interaural time and amplitude, impacting auditory spatial perception.