Learning redundant motor tasks with and without overlapping dimensions: facilitation and interference effects.

Area of Science:

• Motor learning and control
• Neuroscience
• Human-computer interaction

Background:

• Prior motor skill learning influences new, related skill acquisition.
• Motor memories can either facilitate or interfere with subsequent learning.
• The nervous system may learn task geometry and operate within a learned task space.

Purpose of the Study:

• To investigate if transfer of motor learning depends on shared dimensionality between task spaces.
• To test the hypothesis that the nervous system learns task space geometry.

Main Methods:

• Participants learned a prior task and a common criterion task using a data glove to control a cursor.
• Task space dimensionality was manipulated by altering finger motion to cursor position mappings.
• Groups differed in whether the prior task's dimensions shared those of the criterion task.

Main Results:

• Shared task dimensions between prior and criterion tasks led to initial facilitation of learning.
• Non-shared task dimensions resulted in prolonged interference and inefficient task solutions.
• Prior practice shapes the nervous system's understanding and use of task spaces.

Conclusions:

• The nervous system learns task space geometry through practice.
• The degree of shared task space dimensionality critically influences motor skill transfer.
• Understanding task space overlap is key to predicting learning facilitation or interference.