Learning to throw on a rotating carousel: recalibration based on limb dynamics and projectile kinematics

Area of Science:

• Motor control
• Human movement science
• Cognitive neuroscience

Background:

• Skilled actions require continuous calibration to environmental changes.
• Environmental factors like rotation introduce complex dynamics and kinematic perceptions.
• Understanding how the motor system adapts to these changes is crucial for explaining skilled performance.

Purpose of the Study:

• To investigate whether motor recalibration in a rotating environment involves single or multiple components.
• To differentiate between recalibration related to limb dynamics and perceived kinematics.
• To explore the relationship between multiple recalibration components in skilled actions.

Main Methods:

• Participants performed underhand beanbag throws at a target on a rotating carousel.
• Analysis focused on changes in throwing direction after exposure to rotation.
• Experiments were designed to isolate and assess different recalibration mechanisms.

Main Results:

• Exposure to rotation induced a persistent recalibration in throwing direction.
• Recalibration showed an initial decay followed by a stable asymptote.
• Two independent recalibration components were identified: one for limb dynamics (initial decay) and one for perceived kinematics (stable change).

Conclusions:

• Motor recalibration in response to environmental perturbations is multi-component.
• Limb dynamics and perceived kinematics represent independent recalibration processes.
• These findings suggest separate calibration mechanisms operate at different organizational levels of motor control.