The relation between linear extent and velocity in drawing movements.

Area of Science:

• Motor control
• Biomechanics
• Human movement science

Background:

• Movement execution speed is influenced by trajectory characteristics.
• Understanding global metric parameters' role in complex movements is crucial.

Purpose of the Study:

• Investigate the impact of global trajectory parameters on movement speed.
• Analyze the relationship between tangential velocity, trajectory extent, and curvature.

Main Methods:

• Studied free, writing-like movements with varying curvature.
• Analyzed tangential velocity against total trajectory length (perimeter).
• Examined average tangential velocity in relation to average curvature.

Main Results:

• Tangential velocity correlates with trajectory perimeter via a power function.
• Movement execution time remains largely independent of trajectory size (isochrony).
• Average tangential velocity depends on average segment curvature.

Conclusions:

• Global trajectory metrics significantly influence movement speed.
• Motor planning exhibits a tendency towards isochrony in complex movements.
• Curvature plays a key role in modulating average tangential velocity.