Gaze anticipation during human locomotion

Area of Science:

• Neuroscience
• Biomechanics
• Human Locomotion

Background:

• Previous research established a top-down organization in locomotion, with the head stabilizing gaze to anticipate trajectory direction.
• Quantitative data on the anticipatory sequence from gaze to body segments during locomotion has been lacking.

Purpose of the Study:

• To investigate the spatial and temporal anticipatory relationships between gaze direction and body segments during locomotion.
• To analyze how trajectory complexity influences these anticipatory relationships.

Main Methods:

• Participants walked along mentally simulated complex trajectories presented on paper, without visual cues.
• Analysis focused on the horizontal gaze anticipatory behavior and its relationship with upcoming trajectory changes.
• Investigated the hierarchical organization of gaze and body segment orientations.

Main Results:

• Confirmed a hierarchical organization: gaze direction anticipates head orientation, which in turn anticipates other body segments' reorientation.
• Trajectory curvature and task constraints significantly influenced the temporal and spatial anticipation between gaze and body segments.
• Higher curvature led to greater time and spatial anticipation.

Conclusions:

• Gaze plays a crucial anticipatory role in guiding body reorientation during complex locomotion.
• The findings highlight the predictive control mechanisms underlying human movement.
• Gaze exhibits distinct planning strategies at trajectory inflection points.