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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
PubMed
Summary
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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.

Related Experiment Videos

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.