Dynamic sound localization during rapid eye-head gaze shifts

Area of Science:

• Auditory Neuroscience
• Human Perception
• Motor Control

Background:

• Human sound localization relies on head-centered acoustic cues.
• Accurate sound representation requires integrating auditory input with head orientation feedback.
• Predictive remapping using gaze-motor commands or target coordinates is a proposed mechanism for updating auditory targets during head movements.

Purpose of the Study:

• To investigate if the auditory system compensates for dynamic, two-dimensional saccadic eye and head movements during sound localization.
• To determine if the auditory system can handle rapidly changing acoustic cues and relative eye-head orientation during self-initiated movements.
• To differentiate between predictive remapping and dynamic cue processing in auditory localization.

Main Methods:

• Visual-auditory double-step experiments were conducted in two dimensions.
• A brief sound burst was presented during saccadic eye-head gaze shifts towards a visual target.
• Multiple linear regression analysis was used to analyze the relationship between localization responses and intervening eye/head movements.

Main Results:

• Sound localization responses remained accurate despite dynamic eye and head movements.
• Intervening eye and head movements were fully accounted for in localization responses.
• Longer duration sounds (50 ms) yielded more accurate elevation responses than brief sounds (3 ms).

Conclusions:

• The auditory system adequately processes dynamically varying acoustic cues from self-initiated head movements.
• A stable, world-centered representation of sound targets is constructed.
• Results support dynamic cue processing over predictive remapping for auditory localization during rapid head motion.