Visuomotor process in movement correction: role of internal feedback loop

Area of Science:

• Motor Control
• Neuroscience
• Human Movement Science

Background:

• The internal feedback loop is essential for refining motor actions based on sensory predictions.
• Understanding its role in movement correction during interceptive tasks is crucial for predicting and adapting to dynamic environments.

Purpose of the Study:

• To investigate the function of the internal feedback loop in movement correction during interceptive actions.
• To determine if the internal feedback loop's role in movement correction differs based on target speed and probability.

Main Methods:

• Eleven participants completed an interceptive task with moving targets under brief (8 m/s) and long (4 m/s) conditions.
• Target probabilities were manipulated (20-80%, 50-50%, 80-20%) to elicit movement correction.
• Transcranial magnetic stimulation (TMS) was applied to the supplementary motor area to disrupt predictive processing.

Main Results:

• TMS significantly increased temporal error in the brief condition when movement correction was required (20% probability).
• TMS did not significantly affect temporal error in the long condition, regardless of probability.
• This suggests the internal feedback loop is more critical for correcting brief interceptions.

Conclusions:

• The internal feedback loop plays a critical role in movement correction for brief interceptive actions.
• Disruption of the supplementary motor area specifically impacts correction mechanisms for faster, shorter-duration movements.
• These findings highlight the neural underpinnings of adaptive motor control in dynamic scenarios.