Stride cycle influences on goal-directed head movements made during walking

Area of Science:

• Human movement science
• Neuroscience
• Gait analysis

Background:

• Understanding how gait influences head and eye movements is crucial for analyzing human locomotion and visual-motor control.
• Previous research has explored gaze stabilization during locomotion, but the specific impact of gait cycle events on head movement responses to visual targets requires further investigation.

Purpose of the Study:

• To investigate whether specific events within the gait cycle alter head and eye movement responses during a visual target acquisition task.
• To determine if the phase of the stride cycle influences the kinematics of head movements during walking.

Main Methods:

• Six subjects performed rapid horizontal gaze shifts while walking on a treadmill at a self-selected pace.
• Visual targets were presented in the horizontal periphery, with their appearance timed to specific points (25%, 50%, 75%, 100%) of the gait cycle.
• Analysis focused on movement onset latencies of head and eyes, and peak velocity and amplitude of head movements.

Main Results:

• Head and eye movement onset latencies were unaffected by target direction or the gait cycle phase.
• An interaction was observed between gait cycle events and target direction for head movement amplitude and peak velocity.
• This suggests that the phase of the gait cycle can modulate head movement responses to visual stimuli.

Conclusions:

• While gait cycle timing does not alter the initiation of head and eye movements for visual tasks, the execution of head movements is influenced by the ongoing gait phase.
• These findings highlight the complex interplay between locomotion and sensorimotor control during dynamic visual-motor behaviors.