Sensorimotor dynamics of target acquisition and homing in human echolocation

Area of Science:

• Neuroscience
• Sensory Perception
• Human-Computer Interaction

Background:

• Blindness limits environmental sensory information acquisition.
• Active echolocation, using self-generated clicks, is a compensatory technique used by some blind individuals.
• The relationship between echolocation click perception and motor behavior is not well understood.

Purpose of the Study:

• To investigate the perceptual information gained from echolocation clicks.
• To understand how this information informs motor behavior during target localization tasks.
• To explore the sensorimotor dependencies in auditory active sensing without vision.

Main Methods:

• Recorded head movements and clicking behavior of an expert echolocation practitioner.
• Participants localized and oriented toward a target object at varying sizes.
• A passive control condition without clicks was used to confirm the necessity of active sampling.

Main Results:

• Performance significantly improved with larger targets, indicating benefit from echoacoustic information.
• Active echolocation was necessary for effective target convergence, unlike a passive control.
• Clicking behavior and target size influenced the rate and precision of orientation convergence.

Conclusions:

• Dynamic interactions between head movements, click production, and echoacoustic feedback accumulate goal-relevant evidence.
• Clicking behavior and target size modulate the efficiency of sensorimotor strategies for spatial awareness.
• The study illustrates naturalistic sensorimotor dependencies in auditory active sensing for the blind.