Motor training strengthens corticospinal suppression during movement preparation

Area of Science:

• Neuroscience
• Motor Control
• Motor Learning

Background:

• Motor skill acquisition involves neural plasticity.
• Motor preparation processes, including preparatory suppression, are crucial for rapid movement initiation.
• The impact of motor training on preparatory suppression remains unclear.

Purpose of the Study:

• To investigate the effect of motor training on preparatory suppression.
• To examine the relationship between changes in corticospinal excitability (CSE) during preparation and motor learning.
• To determine the behavioral relevance of training-induced modulations in preparatory suppression.

Main Methods:

• Participants underwent motor training on a reaction time task.
• Transcranial magnetic stimulation (TMS) was used to measure CSE at rest and during motor preparation.
• Reaction times and error rates were recorded to assess behavioral performance.

Main Results:

• Motor training improved reaction times without increasing errors.
• Resting CSE increased with training, but CSE during preparation did not follow this trend.
• Preparatory suppression significantly strengthened with practice.
• The degree of strengthened preparatory suppression predicted reaction time gains.

Conclusions:

• Motor training induces specific adaptations in motor preparatory processes.
• Strengthened preparatory suppression is a key neural mechanism underlying training-induced improvements in reaction time.
• These findings highlight the role of preparatory suppression in motor learning and skill enhancement.