Task- and experience-dependent modulation of head-eye coordination during ball interception

The coordination between the head and eyes during the interception of a ball is influenced by both the specific task at hand and the individual's motor experience. In a recent study, researchers examined how these factors affect head-eye contributions to gaze control. The study involved twenty-five female university students, half of whom had no experience with ball sports (novices) and the other half were experienced softball players.

Both groups of participants performed two tasks: visually tracking an approaching ball and simultaneously moving their hand to the predicted landing position of the ball.

By analyzing head, eye, and gaze velocities, researchers found that while the overall gaze velocity remained constant regardless of the task or group, the components of gaze into head and eye movements revealed task-dependent contributions. When comparing the two tasks, the reaching task demonstrated significantly larger head velocity and smaller eye velocity.

This suggests that the head and eyes adjust their movements differently depending on the demands of the task, with the reaching task requiring more head movement flexibility and less eye movement than the tracking task.

Moreover, the cross-correlation between head and gaze velocity was significantly higher during the reaching task than during the tracking task, indicating stronger temporal coupling under greater task demands. The experienced softball players exhibited greater task-dependent modulation of eye velocity than the novices, suggesting a higher level of flexibility in adjusting head-eye movements to meet the demands of each task.

Additionally, experienced players demonstrated a consistently near-zero gaze-head lag, meaning their gaze and head movements were temporally synchronized, regardless of the task. In contrast, novices showed a prolonged interval where their gaze led their head movements.

Overall, these findings indicate that ball sport experience shapes two distinct aspects of head-eye coordination: the flexibility in adjusting the magnitude of these movements to meet task demands, and the ability to maintain stable, temporally synchronized gaze-head control.