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Beyond distance and direction: the brain represents target locations non-metrically
Lore Thaler1, Melvyn A Goodale
1Department of Psychology, The University of Western Ontario, London, ON, Canada. lthaler2@uwo.ca
Journal of Vision
|April 10, 2010
Summary
The brain represents locations using non-metric geometry, not just distance and direction. This finding clarifies how spatial information is processed for everyday actions like pointing.
Area of Science:
- Cognitive Neuroscience
- Human Motor Control
- Spatial Representation
Background:
- Human behavior relies on processing visible target locations.
- The brain's representation of locations can be metric (distance, direction) or non-metric (ordered geometry, topology).
Purpose of the Study:
- To investigate whether the brain represents locations metrically or non-metrically.
- To differentiate the use of metric (distance, direction) versus non-metric (geometrical structure) spatial information.
Main Methods:
- Two experiments measured accuracy and variability of visually guided reach-to-point movements and probe-stimulus adjustments.
- Subjects' responses were analyzed across different coordinate systems (head/eye-centered, hand-centered, allocentric).
Main Results:
- Response variability was lowest when non-metric target location information could be used.
- Data from both experiments showed quantitative correspondence.
- Non-metric response variability could not be predicted from metric conditions.
Conclusions:
- The brain utilizes non-metric geometrical structure for representing locations.
- This provides evidence against purely metric representations for spatial tasks.
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