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Visuomotor adaptation needs a validation of prediction error by feedback error
Valérie Gaveau1, Claude Prablanc2, Damien Laurent1
1INSERM U1028, CNRS UMR5292, Lyon Neuroscience Research Center Bron, France.
Frontiers in Human Neuroscience
|November 20, 2014
Summary
Visuomotor adaptation relies on feedback errors, not just prediction errors. Terminal feedback errors are critical for adaptation, suggesting a combination of feedback and prediction is needed for aftereffects.
Area of Science:
- Neuroscience
- Motor Control
- Human Factors
Background:
- Visuomotor adaptation processes are debated.
- Two error sources: feedback and prediction errors, are intertwined.
Purpose of the Study:
- Clarify relative contributions of feedback vs. prediction errors in visuomotor adaptation.
- Investigate error signals during prism-displaced pointing tasks.
Main Methods:
- Two conditions: terminal feedback error and movement prediction error.
- Subthreshold, progressive prism deviation to ensure unawareness of visual shift.
Main Results:
- Adaptive aftereffect observed only in the terminal feedback error condition.
- Prediction error alone was insufficient to induce adaptation when subjects were unaware.
Conclusions:
- Hand-to-target feedback error signals play a critical role in visuomotor adaptation.
- A combination of feedback and prediction error signals is necessary for aftereffects.
- Feedback error updates reafference prediction during gradual visual perturbations.
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