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Neural basis of disjunctive eye movements
1Department of Neurology, University of Mississippi Medical Center, Jackson, Mississippi 39216-4505, USA. mike@vor.umsmed.edu
Annals of the New York Academy of Sciences
|April 19, 2002
Summary
New research challenges Hering's law of equal innervation for disjunctive saccades. A novel hypothesis suggests a monocular premotor control network, not independent subsystems, generates these eye movements.
Area of Science:
- Neuroscience
- Ophthalmology
- Motor Control
Background:
- Hering's law of equal innervation traditionally explains disjunctive saccades via additive innervation commands from independent oculomotor subsystems.
- This interpretation has been widely accepted but lacks definitive empirical support for all aspects of saccade generation.
Purpose of the Study:
- To challenge the conventional interpretation of Hering's law of equal innervation.
- To propose and model an alternative hypothesis for the generation of disjunctive saccades.
Main Methods:
- Development of a computational model based on a novel hypothesis of saccade generation.
- The model is grounded in known brain-stem anatomy and oculomotor control principles.
Main Results:
- The proposed model successfully simulates realistic disjunctive saccades.
- The model accounts for both initial and late slow vergence movements observed during disjunctive saccades.
Conclusions:
- Evidence suggests disjunctive saccades may originate from a monocular premotor control network, challenging Hering's law.
- This finding necessitates a re-evaluation of oculomotor control mechanisms and the underlying neural circuitry.