We investigated what visual information contributes to on-line control of hand movements. It has been suggested that motion information predominates early in movements but that position information predominates for endpoint control. We used a perturbation method to determine the relative contributions of motion and position information to feedback control. Subjects reached to touch targets in a dynamic virtual environment in which subjects viewed a moving virtual fingertip in place of their own finger. On some trials, we perturbed the virtual fingertip while it moved behind an occluder. Subjects responded to perturbations that selectively altered either motion or position information, indicating that both contribute to feedback control. Responses to perturbations that changed both motion and position information were consistent with superimposed motion-based and position-based control. Results were well fit by a control model that optimally integrates noisy, delayed sensory feedback about both motion and position to estimate hand state.
Visual Feedback Control of Hand Movements
Published 2004 in Journal of Neuroscience
ABSTRACT
PUBLICATION RECORD
- Publication year
2004
- Venue
Journal of Neuroscience
- Publication date
2004-03-31
- Fields of study
Medicine, Computer Science, Psychology
- Identifiers
- External record
- Source metadata
Semantic Scholar, PubMed
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