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Contribution of signals downstream from adaptation to saccade programming
1Department of Physiology, Hokkaido University School of Medicine, Sapporo 060-8638, Japan. masaki@med.hokudai.ac.jp
Journal of Neurophysiology
|September 11, 2003
Summary
The brain uses signals downstream of cerebellar adaptation for planning eye movements. This differs from perception, which uses signals upstream, indicating separate pathways for movement and sensory information.
Area of Science:
- Neuroscience
- Motor Control
- Systems Neuroscience
Background:
- Stable perception and motor planning require information on ongoing behavior.
- Recurrent networks in motor systems are known, but pathways for internal behavioral monitoring are unspecified.
Purpose of the Study:
- To identify the pathways transmitting internal signals for eye-movement programming.
- To investigate the role of cerebellar adaptation in motor planning.
Main Methods:
- Monkeys performed two successive saccades.
- Saccades were made toward previously flashed targets or initial fixation points.
- The second saccade's compensation for adaptive changes in the first saccade was analyzed.
Main Results:
- Pathways downstream of cerebellar adaptation provide signals for subsequent eye-movement programming.
- The second saccade compensated for adaptive changes in the primary saccade.
- This contrasts with upstream signals controlling perceptual localization.
Conclusions:
- Separate recurrent networks exist for processing behavioral information for perception versus movement programming.
- Signals downstream from adaptation are crucial for saccade programming.
- Signals upstream from adaptation are involved in perceptual localization.