Head and Eye Movements Reveal Compensatory Strategies for Acute Binaural Deficits During Sound Localization.

Area of Science:

• Auditory Neuroscience
• Human Motor Control
• Psychoacoustics

Background:

• Sound localization is crucial for auditory perception.
• Head and eye movements play a role in orienting towards sound sources.
• Binaural cues are essential for accurate sound localization.

Purpose of the Study:

• To investigate head and eye movement strategies in sound localization.
• To assess the impact of stationary versus moving sounds on localization.
• To determine how degraded binaural cues affect sound localization in children and adults.

Main Methods:

• Participants (children and adults) localized stationary and moving white noise.
• Two listening conditions: typical binaural hearing and monaural ear plugging.
• Head and eye movements were tracked using gyroscopic sensors and eye-tracking glasses.

Main Results:

• Monaural ear plugging significantly disrupted sound localization for both stationary and moving sounds.
• Eye movements typically preceded head movements in normal binaural listening.
• Head movements increased and favored the unplugged ear during monaural plugging, especially for moving sounds.

Conclusions:

• Accurate sound localization relies on intact binaural cues.
• Head movements demonstrate a compensatory strategy favoring the better-hearing ear when binaural information is degraded.
• Disruption of binaural cues has a more pronounced effect on the localization of moving sounds compared to stationary sounds.