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The relationship between localization and the Franssen effect
W A Yost1, D Mapes-Riordan, S J Guzman
1Parmly Hearing Institute, Loyola University Chicago, Illinois 60626, USA.
The Journal of the Acoustical Society of America
|May 1, 1997
Summary
The Franssen illusion, a sound localization phenomenon, is strongest in live rooms and with mid-frequency tones. This aligns with difficulties in localizing sounds under these specific acoustic conditions.
Area of Science:
- Acoustics
- Psychoacoustics
- Auditory Perception
Background:
- The Franssen effect describes a perceptual illusion where sound localization is altered.
- Understanding the relationship between auditory localization and perceptual illusions is crucial for acoustics and audio engineering.
Purpose of the Study:
- To investigate the correlation between the Franssen effect and sound localization accuracy.
- To determine how room acoustics (sound-deadened vs. live) and stimulus frequency influence the Franssen effect and localization.
Main Methods:
- Listeners performed sound localization and Franssen-effect discrimination tasks.
- Stimuli included wideband noise and tones across various frequencies (250-4000 Hz).
- Experiments were conducted in both sound-deadened and live room environments.
Main Results:
- Poor performance in Franssen-effect discrimination correlated with strong illusion conditions.
- Both Franssen effect discrimination and localization tasks showed poor performance for mid-frequency tones (around 1500 Hz) in the live room.
- The Franssen illusion was most pronounced in the live room and with mid-frequency tones.
Conclusions:
- The Franssen illusion is strongest in live rooms and for mid-frequency tones.
- Findings support a correlation between the Franssen effect and localization difficulties in rooms.
- Results are consistent with previous research on auditory spatial perception.
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