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Published on: August 8, 2019
Perceived reachability in single- and multiple-degree-of-freedom workspaces
Carl Gabbard1, Diala Ammar, Sunghan Lee
1Department of Health and Kinesiology, Texas A&M University, College Station, TX 77843-4243, USA. c-gabbard@tamu.edu
Journal of Motor Behavior
|December 2, 2006
Summary
People overestimate their reach, especially in complex movements involving multiple degrees of freedom (m-df). This overestimation bias was significantly greater in m-df conditions compared to single-degree-of-freedom tasks.
Area of Science:
- Human motor control
- Perception-action coupling
Background:
- Accurate perception of reachability is crucial for effective motor control.
- Previous research indicates a consistent overestimation bias when comparing perceived and actual reaches.
Purpose of the Study:
- To investigate how workspace complexity (single vs. multiple degrees of freedom) affects reachability overestimation.
- To examine the influence of visual field location (midline vs. peripheral) on this overestimation bias.
Main Methods:
- Twenty-eight right-handed participants judged the reachability of targets in 1-degree-of-freedom (1-df) and multiple-degrees-of-freedom (m-df) workspaces.
- Targets were presented in the midline, right, and left visual fields.
Main Results:
- Both 1-df and m-df conditions showed an overestimation bias.
- The overestimation bias was significantly greater in the m-df condition.
- Midline targets showed greater overestimation than targets in the right and left visual fields.
Conclusions:
- Movement complexity, particularly involving multiple degrees of freedom, amplifies the overestimation bias in reachability perception.
- Peripheral visual fields may elicit more conservative reachability judgments, potentially due to perceived constraints.
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