Two ways to save a newly learned motor pattern.

Area of Science:

• Motor control
• Human locomotion
• Neuroplasticity

Background:

• Human locomotion exhibits remarkable adaptability to changing environments.
• The nervous system's ability to retain learned movements is crucial for navigating diverse terrains and rehabilitation.

Purpose of the Study:

• To investigate the mechanisms underlying savings in newly learned walking patterns.
• To determine the factors influencing savings and relearning after environmental changes.
• To explore whether explicit environmental information is stored alongside motor learning.

Main Methods:

• Utilized a split-belt treadmill to induce and study adaptation of walking patterns.
• Systematically varied learning and unlearning environments in Experiment 1.
• Assessed recall of environmental information in Experiment 2.

Main Results:

• Savings were influenced by previous exposure to abrupt environmental changes and duration of exposure.
• Relearning was fastest when prior exposure and training duration coincided.
• Gradual environmental introduction during learning did not result in savings.
• Recall of previously experienced walking environments was driven by prior abrupt environmental changes.
• Recalled information pertained to extrinsic environmental cues (treadmill speeds), not intrinsic walking patterns.

Conclusions:

• Long-term savings of learned walking patterns require more than just motor learning.
• Savings involve the recall of environmental context or extended practice at the adapted state.
• Explicit memory of environmental conditions plays a significant role in motor adaptation and retention.