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Voluntary head movement and allocentric perception of space.
1CNRS/Collège de France, Paris, France. wexler@ccr.jussieu.fr
Psychological Science
|June 17, 2003
Summary
The brain uses an allocentric frame of reference for spatial vision more during voluntary movement. Motor commands are crucial for objective space perception, influencing egocentric versus allocentric bias.
Area of Science:
- Cognitive Neuroscience
- Human Perception
- Spatial Vision
Background:
- Visual input is often egocentric, but some perceptions are allocentric (independent of observer's viewpoint).
- Understanding how the brain processes spatial information during self-motion is key to spatial vision research.
Purpose of the Study:
- To investigate the visual perception of 3D object motion during voluntary and involuntary human motion.
- To determine the role of motor commands in spatial perception and reference frame bias.
Main Methods:
- Three experiments were conducted with human subjects.
- Subjects experienced voluntary and involuntary motion, with analysis of spatial criteria application.
Main Results:
- Voluntary head movements led to greater use of an allocentric frame of reference compared to involuntary displacements.
- Involuntary motion induced a more egocentric bias in spatial perception.
- Allocentric bias diminished when self-motion and motor command were mismatched.
Conclusions:
- Motor commands significantly contribute to the objective perception of space.
- The brain's use of allocentric versus egocentric frames depends on the nature of self-motion and motor command execution.