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Updated: Dec 13, 2025
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Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
Published on: April 16, 2014
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Action capability constrains visuo-motor complexity during planning and performance in on-sight climbing
Marlene H van Knobelsdorff1, Nikki G van Bergen1, John van der Kamp1,2,3
1Faculty of Behavioural and Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands.
Scandinavian Journal of Medicine & Science in Sports
|August 5, 2020
Summary
Climber fingertip strength influences gaze and movement complexity. Strength affects how climbers adapt to challenging routes, with optimal complexity occurring at moderate strength levels.
Area of Science:
- Sports Science
- Motor Control
- Biomechanics
Background:
- Adaptability is key for physical activities and sports.
- The affordance-based control perspective suggests individuals act within their capability limits.
- The interplay between strength and skill in shaping performer-environment interactions requires further investigation.
Purpose of the Study:
- To determine if fingertip strength influences gaze and climbing behavior patterns on routes of increasing difficulty.
- To explore the relationship between climber strength and the complexity of visuo-motor behavior.
Main Methods:
- Twenty climbers of varying skill levels participated.
- Maximum fingertip strength was measured.
- Participants previewed and climbed two traverses of decreasing edge depth while gaze and hip positions were recorded.
- Gaze transition entropy and hip displacement entropy were computed to quantify behavior complexity.
Main Results:
- Statistically significant curvilinear relationships were found between fingertip strength and gaze transition entropy.
- A significant curvilinear relationship was also observed between fingertip strength and hip displacement entropy.
- Visuo-motor complexity scales with the proximity of action to environmental affordance boundaries, considering individual constraints.
Conclusions:
- Fingertip strength significantly modulates gaze and movement complexity in climbing.
- Climbing behavior complexity is not linear with strength; optimal complexity is observed at moderate strength levels.
- Future research should further explore the relationship between action capabilities and functional movement variability.
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