Motor variability modulates calibration of precisely timed movements.

Area of Science:

• Neuroscience
• Motor Control
• Perception

Background:

• Precise timing is crucial for interacting with the environment.
• Neural noise can impact timed movements, requiring the brain to adapt.
• Previous research shows the brain recalibrates temporal estimates based on perceptual variability.

Purpose of the Study:

• To investigate how the brain handles uncertainty in both sensory and motor stages of time-critical movements.
• To determine if the brain possesses separate knowledge of sensory and motor uncertainty.
• To examine how movement variability influences the recalibration of temporal perception.

Main Methods:

• Manipulated sensory and motor variability in timed movement tasks.
• Analyzed serial dependencies between interval durations and motor reproductions across trials.
• Tested generalization of these dependencies across different effectors and tasks.

Main Results:

• The sensorimotor system recalibrates sensory and motor uncertainty independently.
• Serial dependencies in motor reproduction were modulated by movement variability.
• These dependencies generalized across effectors but not to a visual discrimination task.

Conclusions:

• The brain accurately estimates and separately processes motor uncertainty in timed movements.
• Knowledge of motor uncertainty is distinct from knowledge of sensory uncertainty.
• This suggests specialized neural mechanisms for managing different sources of temporal error.