(De)stabilization of required and spontaneous postural dynamics with learning.

Area of Science:

• Motor control and learning
• Human movement science
• Biomechanics

Background:

• Understanding how learning new movement patterns affects existing motor skills is crucial.
• The influence of practice on the broader postural repertoire remains incompletely understood.

Purpose of the Study:

• To investigate the impact of learning a novel ankle-hip coordination on pre-existing postural patterns.
• To determine if learning generalizes to unpracticed coordination modes and across different task types.

Main Methods:

• Participants learned a specific ankle-hip coordination (90' relative phase).
• Postural patterns were assessed before and after practice in both required and spontaneous tasks.
• Evaluated coordination dynamics across 12 relative phases in the required task and a tracking task.

Main Results:

• Learning improved and homogenized performance across the entire postural repertoire in the required task.
• In spontaneous tasks, pre-existing in-phase and antiphase patterns shifted towards the learned 90' pattern.
• Learning effects were task-dependent, showing limited generalization across different task types.

Conclusions:

• Learning a new coordination pattern can modify unpracticed motor patterns.
• The generalization of motor learning is constrained by task context, even with similar coordination modes.
• Findings inform theories on the specificity and generality of motor learning mechanisms.