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Separating Predicted and Perceived Sensory Consequences of Motor Learning
Bernard Marius 't Hart1, Denise Y P Henriques1
1Centre for Vision Research, York University, Toronto, Ontario, Canada.
Plos One
|September 23, 2016
Summary
Motor adaptation shifts perceived hand position. This study shows that changes in proprioception, not just predicted sensory consequences, significantly contribute to altered hand localization during visuomotor adaptation.
Area of Science:
- Neuroscience
- Motor Control
- Perception
Background:
- Motor adaptation aims to minimize sensory prediction errors.
- Measuring action predictions is challenging.
- Previous studies show hand mislocalization after visuomotor adaptation.
Purpose of the Study:
- To differentiate between changes in predicted sensory consequences and perceived proprioceptive consequences in hand localization shifts.
- To quantify the contribution of proprioceptive recalibration versus predictive updating.
Main Methods:
- Visuomotor adaptation to a rotated cursor.
- Comparing hand localization changes in self-generated ('active') versus robot-generated ('passive') movements.
- Assessing hand position perception under different movement conditions.
Main Results:
- Both active and passive localization tasks showed significant changes in hand localization after adaptation.
- Changes in localization were slightly larger in the active condition.
- Passive localization, lacking volitional movement, still revealed substantial localization shifts.
Conclusions:
- Hand localization changes after visuomotor adaptation are not solely based on updating predicted sensory consequences.
- Proprioceptive recalibration plays a substantial role in altered hand position perception.
- Motor adaptation involves significant changes in the internal state estimate of limb position.
