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Effects of explicit sway-minimization on postural--suprapostural dual-task performance
1Department of Psychology, Institute for Applied Cognitive Science, University of Warwick, Gibbett Hill Road, Coventry CV47AL, UK. pssbt@warwick.ac.uk
Human Movement Science
|June 18, 2004
Summary
Participants reduced body sway when instructed, but increased sway and errors with higher visual search loads. Stance (open vs. closed) affected performance differently based on instructions, challenging current dual-tasking theories.
Area of Science:
- Human motor control
- Cognitive neuroscience
- Applied physiology
Background:
- Dual-tasking research often examines resource competition between postural and suprapostural tasks.
- Previous models struggle to explain complex interactions between postural sway and cognitive load.
Purpose of the Study:
- To investigate how visual search load and postural instructions influence postural sway and task performance.
- To test existing dual-tasking hypotheses against observed data.
Main Methods:
- Participants performed a visual search task in immersive conditions under varying postural instructions (minimize sway vs. search-only).
- Stance (open vs. closed) and visual search load were manipulated.
- Postural sway and search task performance (errors, speed) were measured.
Main Results:
- Increased visual search load led to greater sway and more errors, regardless of instructions.
- Participants successfully reduced sway when instructed to do so.
- Stance effects on search speed reversed depending on postural instructions.
Conclusions:
- Neither facilitatory control nor resource-competition models fully explain the observed task interactions.
- Adaptive resource-sharing is proposed as a more comprehensive alternative theory for postural-suprapostural dual-tasking.