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Neural control of three-dimensional eye and head posture
Eliana M Klier1, J Douglas Crawford
1Canadian Institute of Health Research Group for Action and Perception, York Centre for Vision Research and Departments of Psychology, Biology and Kinesiology Health Sciences, York University, Toronto, Ontario, Canada.
Annals of the New York Academy of Sciences
|December 10, 2003
Summary
The interstitial nucleus of Cajal (INC) generates signals to stabilize gaze. Inactivation of the INC prevents the eyes and head from maintaining steady positions after movements.
Area of Science:
- Neuroscience
- Ophthalmology
- Motor Control
Background:
- Neural control of gaze involves dynamic and tonic signals for movement and stabilization.
- The interstitial nucleus of Cajal (INC) is a key brainstem structure implicated in gaze control.
Purpose of the Study:
- To investigate the role of the interstitial nucleus of Cajal (INC) in producing tonic signals for gaze stabilization.
- To determine how the INC encodes torsional and vertical commands for eye and head orientation.
Main Methods:
- Microstimulation and chemical inactivation techniques were employed.
- Experiments were conducted on both head-fixed and head-free macaques.
Main Results:
- The right INC controls clockwise eye and head movements, while the left INC controls counterclockwise movements.
- Temporary INC inactivation impaired the ability to maintain torsional and vertical eye and head positions post-gaze shift.
- The INC utilizes distinct coordinate coding strategies for torsional and vertical gaze commands.
Conclusions:
- The INC is crucial for generating tonic commands that maintain eye and head orientation between gaze shifts.
- The INC's coding strategies are adapted to the biomechanical constraints of the eye and head.
- These findings elucidate the neural mechanisms underlying gaze stabilization.