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Published on: April 11, 2025
The proximity of visual landmarks impacts reaching performance
Olav Krigolson1, Nick Clark, Matthew Heath
1School of Physical Education, University of Victoria, PO Box 3015, STN CSC Victoria, BC, Canada, V8W 3P1. olav@uvic.ca
Spatial Vision
|June 28, 2007
Summary
Allocentric visual cues aid reaching accuracy, but only when close to the target. Distant backgrounds do not improve performance, suggesting proximity is key for using visual background information in goal-directed movements.
Area of Science:
- Neuroscience
- Motor Control
- Visual Perception
Background:
- Goal-directed reaching typically uses egocentric visual information from the dorsal visual pathway.
- Allocentric comparisons between visual backgrounds and targets may also enhance reaching accuracy.
Purpose of the Study:
- To investigate how the distance between a visual background and a target affects the effectiveness of allocentric comparisons for reaching accuracy.
Main Methods:
- Participants performed memory-guided reaching movements.
- Targets were presented in an empty visual background or with proximal, medial, or distal backgrounds.
Main Results:
- Proximal and medial visual backgrounds reduced endpoint variability in reaching.
- Distal visual backgrounds did not reduce endpoint variability.
- Allocentric cue effectiveness is linked to target proximity.
Conclusions:
- Allocentric visual information aids reaching, but its utility diminishes with increasing distance from the target.
- This suggests integration of dorsal and ventral visual stream information for online reaching control, dependent on cue proximity.
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