Task space exploration improves adaptation after incompatible virtual surgeries.

Area of Science:

• Neuroscience
• Motor Control
• Motor Learning

Background:

• Motor skill acquisition involves generating new muscle activity patterns.
• Muscle synergies simplify motor control by combining a limited set of muscle activation patterns.
• Previous research showed adaptation to compatible virtual surgeries but failure with incompatible ones.

Purpose of the Study:

• To investigate if task space exploration promotes learning of novel muscle synergies after incompatible virtual surgeries.
• To understand the role of exploration time in motor skill adaptation.

Main Methods:

• Participants performed a reaching task with extended trial times to allow for exploration.
• Myoelectric control was used to simulate virtual surgeries altering muscle-to-cursor mapping.
• Movement accuracy, success rate, and reaction time were measured.

Main Results:

• Improved trial success rates were observed after incompatible virtual surgeries with increased exploration time.
• Movement direction accuracy improved faster for corrective movements than initial movements, indicating feedback control benefits.
• Increased reaction times suggested the use of explicit strategies to overcome incompatible surgeries.

Conclusions:

• Task space exploration is crucial for learning new motor skills requiring novel muscle synergies.
• Humans can learn new muscle synergies with sufficient practice time and exploration.
• Learning new synergies may be more effective when utilized for feedback control.