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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics

Background:

  • Intense low-frequency (LF) sound exposure causes temporary hearing threshold shifts, known as the "Bounce phenomenon" (BP).
  • The BP involves oscillations in hearing sensitivity (hyper- and hyposensitivity) for several minutes post-exposure.
  • Auditory lateralization, the ability to localize sound, relies on processing interaural level differences (ILDs) and interaural time differences (ITDs).

Purpose of the Study:

  • To investigate the impact of the BP on auditory lateralization in healthy human subjects.
  • To determine if LF sound-induced BP affects the perception of sound source location.

Main Methods:

  • Participants underwent auditory lateralization tests measuring the interaural level difference (ILD) required for perceived midline localization.
  • An intense LF sound was presented to one ear to induce the BP.
  • ILD measurements were taken before and after LF sound exposure.

Main Results:

  • In 65% of recordings, significant deviations in perceived sound midline were observed after LF sound exposure.
  • A binaural stimulus perceived as centered was perceptually shifted laterally after LF sound exposure.
  • These shifts demonstrated time-variant changes in auditory lateralization.

Conclusions:

  • Intense LF sound exposure, inducing the BP, can lead to a temporary bias in ILD-based sound localization.
  • The BP transiently disrupts the brain's ability to accurately determine sound source position.
  • This finding highlights the impact of temporary cochlear changes on complex auditory processing like lateralization.