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Control strategies when intercepting slowly moving targets.

A Dubrowski¹, H Carnahan

¹Department of Kinesiology, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada.

Journal of Motor Behavior

|March 27, 2001

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People control manual interceptive movements to slow targets using anticipatory mechanisms, not visual feedback. Hand speed scales with target speed, indicating distinct strategies for interception versus tracking.

Area of Science:

Human motor control
Perception and action

Background:

Manual interceptive movements are crucial for daily activities.
Understanding the control strategies for intercepting moving targets is essential.

Purpose of the Study:

To investigate how individuals control manual interceptive movements towards slowly moving targets.
To compare interception strategies with tracking strategies.

Main Methods:

Three experiments were conducted with participants (N=8) using computer mouse and graphics tablet.
Participants intercepted targets moving at various velocities and distances.
A tracking task was included in Experiment 3 to compare movement control.

Main Results:

Hand speed correlated with target speed, even for slow targets and altered distance ratios.

Related Experiment Videos

Interception movements involved longer planning times.

Tracking movements showed longer deceleration times, suggesting more visual feedback.

Conclusions:

Participants scale interception movements to target speed but use a different strategy than tracking.
Anticipatory mechanisms, rather than visual feedback, are likely employed during target interception.