Prospective versus predictive control in timing of hitting a falling ball

Area of Science:

• Human motor control
• Visuomotor coordination
• Perception-action coupling

Background:

• Debate on prospective vs. predictive control for intercepting falling objects.
• Prospective control uses continuous information (e.g., time-to-contact, τ).
• Predictive control relies on pre-programmed movements and internal models (e.g., gravity).

Purpose of the Study:

• Test predictive and prospective control hypotheses in object interception.
• Examine movement initiation and duration under visual occlusion.
• Investigate evidence for movement modulation during interception.

Main Methods:

• Participants (n=12) batted balls dropped from varying heights (1, 1.3, 1.5m).
• Full-vision and partial occlusion (280-380ms) conditions were used.
• Movement initiation, duration, and modulation were analyzed.

Main Results:

• Swing initiation was not consistent across drop heights or timing variables.
• Movement onset was unaffected by visual occlusion, suggesting predictive control (TTC2).
• Movement modulation and compensatory variability indicated prospective control (τ).

Conclusions:

• Predictive control (TTC2) initiates swings, while prospective control (τ) guides interception.
• Human interception involves a combination of predictive and prospective control strategies.
• Movement is variable but modulated to meet task demands, supporting adaptive visuomotor control.