The CNS stochastically selects motor plan utilizing extrinsic and intrinsic representations

Area of Science:

• Neuroscience
• Motor Control
• Human Movement Science

Background:

• Traditional motor studies assume a single, optimized motor plan for task execution.
• Existing models of motor control lack explicit stages for plan selection.

Purpose of the Study:

• To investigate the motor planning and execution stages in a novel via-point task.
• To determine if subjects select randomly from available motor plans.
• To examine the influence of pre-training and via-point orientation on motor plan selection.

Main Methods:

• Subjects performed a novel via-point task.
• Analysis of movement patterns and plan selection strategies.
• Investigation of pre-training and via-point orientation effects.

Main Results:

• The via-point task revealed distinct planning and execution phases.
• Subjects demonstrated random selection among multiple potential motor plans.
• Motor plan selection was dependent on prior movements and intrinsic/extrinsic body constraints.

Conclusions:

• Human motor planning involves an explicit plan selection stage.
• Current motor control models need to incorporate plan selection for a comprehensive understanding.
• Movement variability arises from the selection process among available motor plans.