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Coding of on-line and pre-planned movement sequences.

Attila J Kovacs¹, Jason Boyle, Nicole Grutmatcher

¹Texas A&M University, Department of Health and Kinesiology, TAMU 4243, College Station, TX 77845-4243, United States.

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Summary

Movement coding depends on control mode, not just practice or difficulty. On-line control uses visual-spatial coordinates, while pre-planned control favors motor coordinates for movement sequences.

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Area of Science:

Motor control research
Cognitive neuroscience
Human movement science

Background:

Movement sequences are coded in either visual-spatial or motor coordinates.
This coding is influenced by practice and sequence complexity.
The role of control processes in determining coordinate system use remains unclear.

Purpose of the Study:

To investigate whether the control process, rather than sequence difficulty, determines the coordinate system for movement sequences.
To examine the impact of concurrent feedback on motor control and coordinate system selection.

Main Methods:

Two groups practiced the same movement sequence under different concurrent feedback conditions.
One group received concurrent visual feedback (encouraging on-line control).
The other group did not receive feedback (encouraging pre-planned control).

Main Results:

Concurrent visual feedback led to better transfer with the contralateral limb when visual-spatial coordinates were reinstated.
Lack of concurrent visual feedback resulted in better transfer when motor coordinates were reinstated.
This suggests a link between feedback, control mode, and coordinate system preference.

Conclusions:

The mode of control (on-line vs. pre-planned) dictates the coordinate system used for movement sequences.
This finding challenges previous hypotheses emphasizing sequence difficulty or practice stage.
Control strategy is a key factor in motor learning and representation.