Prospective control in catching: the persistent Angle-of-approach effect in lateral interception

Area of Science:

• * Motor control and perception
• * Human movement science
• * Visuomotor coordination

Background:

• * Lateral interception tasks reveal systematic differences in hand movement kinematics based on ball trajectory angles.
• * The angle-of-approach effect is generally attributed to prospective (on-line) movement control.
• * Previous research suggested perceptual biases in predicting passing distance contribute to this effect.

Purpose of the Study:

• * To investigate the role of perceptual biases in the angle-of-approach effect during lateral interception.
• * To determine if the angle-of-approach effect persists when perceptual biases are experimentally controlled.
• * To explore the underlying information used for visuomotor control in interception tasks.

Main Methods:

• * Experiments 1-3 validated the experimental setup using rectilinear trajectories and a line-intersection extrapolation task to replicate and correct perceptual biases.
• * Experiment 4 involved participants intercepting virtual balls using bias-controlled trajectories with zero perceptual bias.
• * Analysis focused on the kinematics of hand movement and the emergence of the angle-of-approach effect under controlled conditions.

Main Results:

• * The angle-of-approach effect was replicated in lateral interception tasks with rectilinear ball trajectories (Experiment 1).
• * Perceptual biases in line-intersection extrapolation were identified and corrected using bias-free trajectories (Experiments 2 & 3).
• * The angle-of-approach effect persisted even when participants intercepted balls on trajectories with zero perceptual bias (Experiment 4).

Conclusions:

• * The angle-of-approach effect in lateral interception is not solely explained by perceptual biases in predicting future passing distance.
• * This finding challenges existing theories and suggests that visuomotor control mechanisms may rely on different sources of information.
• * Further research is needed to fully elucidate the information-based regulation of hand movement during dynamic interception tasks.