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Visuomotor Map Determines How Visually Guided Reaching Movements are Corrected Within and Across Trials
Takuji Hayashi1, Atsushi Yokoi2, Masaya Hirashima3
1Division of Physical and Health Education, Graduate School of Education, The University of Tokyo, Tokyo 113-0033, Japan; Japan Society for the Promotion of Science, Tokyo 102-8471, Japan.
Eneuro
|June 9, 2016
Summary
Implicit motor control, including online and offline corrections, relies on the same visuomotor map. This map transforms visual information into motor commands, influencing how movements adapt to unexpected perturbations and target changes.
Area of Science:
- Neuroscience
- Motor Control
- Human Movement Science
Background:
- Visually guided reaching movements are corrected via immediate feedback control (online) and subsequent feedforward adjustments (offline/motor adaptation).
- The precise relationship between feedback and feedforward control mechanisms in motor learning remains incompletely understood.
Purpose of the Study:
- To investigate whether implicit online and offline movement corrections utilize a shared visuomotor map.
- To determine how distortions in the visuomotor map affect online and offline motor corrections.
Main Methods:
- Human participants performed reaching movements towards targets under artificially distorted visuomotor maps created by visual rotations.
- The impact of these map distortions on online correction (response to sudden target changes) and offline correction (aftereffects from previous trials) was analyzed.
Main Results:
- The magnitude of online movement correction was significantly altered based on the specific distortion (shape) of the visuomotor map.
- Offline movement correction, observed as aftereffects, was also modulated by the visuomotor map's shape.
Conclusions:
- Both implicit online and offline movement corrections depend on the same visuomotor map for transforming visual object locations into motor commands.
- The visuomotor map serves as a fundamental component of implicit motor control, underscoring the interconnectedness of feedforward control, feedback control, and motor adaptation.
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