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Auditory localization in the vertical plane: accuracy and constraint on bodily movement
1Department of Psychology, University of New England, Armidale, New South Wales, Australia.
The Journal of the Acoustical Society of America
|November 1, 1987
Summary
Listeners limiting head movements during sound localization tasks showed altered perception of sound elevation. High-frequency sounds were perceived as higher, while low-frequency sound errors were inconsistent, suggesting imperfect vertical sound localization sensitivity in some individuals.
Area of Science:
- Auditory perception
- Psychoacoustics
- Human spatial hearing
Background:
- Sound localization relies on various auditory cues.
- Head and body movements play a crucial role in refining spatial hearing accuracy.
- Previous research suggests potential anomalies in vertical sound localization.
Purpose of the Study:
- To investigate the impact of restricted body and head movement on sound localization accuracy.
- To examine the perception of high- and low-frequency sounds under movement constraints.
- To explore the nature of anomalous errors in vertical sound localization.
Main Methods:
- Participants localized narrow bands of noise (2.3 and 8.3 kHz) under progressively limited head/body movement conditions.
- Experiment 1 and 2 involved preliminary constraint variations.
- Experiment 3 replicated prior study conditions more closely.
Main Results:
- Increasing movement restriction led to high-frequency sounds being perceived as elevated.
- Low-frequency sounds, when elevated, were inconsistently perceived as below the horizon.
- A third experiment confirmed anomalous low-frequency localization errors, consistent with previous reports.
Conclusions:
- Movement restriction significantly impacts perceived sound elevation, particularly for high frequencies.
- Anomalous low-frequency localization errors may stem from a default response in individuals with imperfect vertical dimension sensitivity.
- Approximately 25% of individuals with normal hearing may exhibit this spatial hearing insensitivity.