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Published on: March 21, 2019
Spatial error detection in rapid unimanual and bimanual aiming movements
1Department of Integrative Physiology, 354 UCB, University of Colorado, Boulder, CO 80309-0354, USA. Sherwood@Colorado.edu
Perceptual and Motor Skills
|May 12, 2009
Summary
This study found that people underestimate movement errors, whether using one or both hands. Concurrent processing of sensory information from two hands is possible during aiming tasks.
Area of Science:
- Motor Control
- Human Movement Science
- Cognitive Psychology
Background:
- Closed-loop theories posit movement errors arise from comparing sensory feedback to a reference state.
- Discrepancies generate error signals crucial for motor correction.
Purpose of the Study:
- To investigate if error detection accuracy differs between unimanual and bimanual movements.
- To determine if movement distance affects error detection accuracy.
- To explore the concurrent processing of sensory information during aiming tasks.
Main Methods:
- 36 participants performed rapid aiming movements of varying distances using one or both hands.
- Participants verbally estimated movement distance prior to feedback.
- Error detection quantified via correlation and mean absolute difference between actual and estimated distances.
Main Results:
- Error detection accuracy did not improve with longer movements.
- Participants consistently underestimated movement errors across all conditions.
- Strong positive correlations indicated effective concurrent processing of sensory information in both unimanual and bimanual tasks.
Conclusions:
- Motor control systems can concurrently process sensory feedback from multiple limbs.
- Underestimation of errors is a consistent finding in this type of motor task.
- Movement distance does not appear to enhance error detection accuracy.
