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Spatial Release From Masking With Bilateral Bone Conduction Stimulation at Mastoid for Normal Hearing Subjects.

Jie Wang1, Sijia Xie1, Stefan Stenfelt2

  • 1School of Electronics and Communication Engineering, Guangzhou University, Guangzhou, China.

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Summary

Spatial release from masking (SRM) was studied using bone conduction (BC) and air conduction (AC) in normal-hearing adults. Results show spatial separation improves speech recognition, with AC outperforming BC at wider angles.

Keywords:
bone conductionspatial release from maskingspeech intelligibilityspeech recognition threshold

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Area of Science:

  • Audiology
  • Psychoacoustics
  • Auditory Neuroscience

Background:

  • Spatial release from masking (SRM) is crucial for understanding speech in complex auditory environments.
  • Bone conduction (BC) hearing offers a unique pathway for sound transmission, distinct from air conduction (AC).
  • Investigating SRM with BC stimulation is essential for understanding its potential in hearing aid technology and auditory rehabilitation.

Purpose of the Study:

  • To investigate the effects of spatial release from masking (SRM) using bilateral bone conduction (BC) stimulation at the mastoid.
  • To compare SRM for BC and air conduction (AC) stimulation across various spatial configurations.
  • To determine the influence of angular separation and sound modality on speech recognition thresholds (SRTs).

Main Methods:

  • Nine normal-hearing adults participated in the study.
  • Speech recognition thresholds (SRTs) were measured in simulated spatial setups (0-180 degrees) using non-individualized head-related transfer functions.
  • Stimulation was delivered via bilateral BC at the mastoid and AC through headphones.

Main Results:

  • Both angular separation and sound modality significantly impacted speech recognition.
  • Increasing spatial separation up to 150° improved SRTs for both BC and AC, with a slight decline beyond 150°.
  • AC showed significantly greater SRM than BC for separations >75°, while BC offered greater, though not statistically significant, benefits for separations <75°.
  • The 'better ear effect' was not significant for same-sided sources but dominated SRM for opposite-sided sources.

Conclusions:

  • Spatial separation enhances speech intelligibility for both BC and AC, but AC provides superior benefits at larger spatial angles.
  • BC stimulation offers unique insights into spatial hearing mechanisms, particularly at closer spatial separations.
  • Understanding these modality-specific spatial effects is vital for developing advanced audiological devices and strategies.