Effects of Bone Vibrator Position on Auditory Spatial Perception Tasks.

Area of Science:

• Auditory perception research
• Human-computer interaction
• Biomedical engineering

Background:

• Previous studies show bone conduction (BC) vibrators can be localized.
• This research expands on BC vibrator placement beyond the jaw.
• Skull's minimal sound attenuation is relevant to BC hearing.

Purpose of the Study:

• To compare the spatial localization accuracy of virtual audio signals delivered via bone conduction (BC) vibrators and air conduction (AC) headphones.
• To investigate the effect of different BC vibrator placements (front, top, back) on localization performance.
• To determine if BC devices can substitute for AC headphones without compromising spatial audio perception.

Main Methods:

• Participants localized virtual audio signals from 16 horizontal positions.
• Signals were delivered using circumaural headphones (air conduction) or BC vibrators placed at the front, top, or back of the ears.
• Localization accuracy was measured by the participant's ability to identify the signal's origin.

Main Results:

• Localization accuracy with BC vibrators placed at the front and top of the ears was comparable to that achieved with AC headphones.
• Localization performance was significantly less accurate when BC vibrators were placed at the back of the ears compared to headphones and the front BC position.
• The findings support the efficacy of BC transducers for spatial audio localization.

Conclusions:

• Listeners can localize virtual 3D audio signals effectively using both air conduction (AC) and bone conduction (BC) transducers.
• Bone conduction devices offer a promising alternative to AC headphones for delivering spatial auditory information without occluding the ears.
• Optimal BC vibrator placement for localization is in front of the ears, though top or back placements may be acceptable depending on operational or integration requirements.