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Relative effectiveness of three stimulus variables for locating a moving sound source
L D Rosenblum1, C Carello, R E Pastore
1State University of New York, Binghamton 13901.
Perception
|January 1, 1987
Summary
Listeners use acoustic cues like amplitude change, interaural temporal differences, and the Doppler effect to detect passing sound sources. Amplitude change was the most dominant cue, followed by interaural temporal differences, then the Doppler effect.
Area of Science:
- Auditory Perception
- Acoustics
- Psychoacoustics
Background:
- Understanding how humans perceive the motion of sound sources is crucial for fields like audio engineering and robotics.
- Previous research has identified various acoustic cues, but their relative importance in real-time motion detection is not fully established.
Purpose of the Study:
- To investigate the relative importance of three acoustic variables—interaural temporal differences, Doppler effect, and amplitude change—in indicating the passage of a moving sound source.
- To determine which acoustic cue listeners rely on most when multiple cues provide conflicting information about source passage.
Main Methods:
- Presenting isolated acoustic variables (interaural temporal differences, Doppler effect, amplitude change) to observers to assess their ability to detect a passing sound source.
- Creating a competitive scenario where each acoustic variable indicated a different time of closest passage to determine cue dominance.
Main Results:
- All three acoustic variables (interaural temporal differences, Doppler effect, amplitude change) reliably indicated the passage of a moving sound source when presented individually.
- In a competitive scenario, amplitude change dominated interaural temporal differences, which in turn dominated the Doppler effect.
Conclusions:
- Listeners prioritize amplitude change over interaural temporal differences and the Doppler effect when judging the passage of a moving sound source.
- The observed dominance hierarchy suggests listeners may prioritize cues that are less dependent on environmental conditions, rather than solely relying on discriminability.