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Reorganization in the visual cortex after retinal and cortical damage.
U T Eysel1, G Schweigart, T Mittmann
1Institute oflPhysiology, Department of Neurophysiology, School of Medicine, Ruhr-University Bochum, D-44780 Bochum, Germany. eysel@neurop.ruhr-uni-bochum.de
Restorative Neurology and Neuroscience
|April 3, 2003
Summary
Both retinal and cortical lesions trigger visual cortical plasticity. This involves reduced GABAergic inhibition and increased glutamatergic excitation, facilitating neural reorganization and long-term potentiation (LTP).
Area of Science:
- Neuroscience
- Visual System Plasticity
- Cortical Reorganization
Background:
- Retinal and cortical lesions are distinct events.
- Both can induce plasticity in the visual cortex.
Purpose of the Study:
- Compare cortical effects of retinal lesions with cortical lesions.
- Investigate the underlying mechanisms of visual cortical plasticity.
Main Methods:
- In vivo experiments on anaesthetized adult cats.
- Induction of retinal lesions using Xenon-light photocoagulation.
- Induction of cortical lesions via heat or ibotenic acid injection.
Main Results:
- Initial suppression of single neuron activity followed by increased activity near lesions.
- Increased NMDA and reduced GABA responses around cortical lesions.
- Facilitated long-term potentiation (LTP) and shifts in retinal representation.
Conclusions:
- Retinal and cortical lesions initiate a common cascade in the visual cortex.
- This cascade involves altered excitation-inhibition balance, promoting plasticity.
- This plasticity underlies neuronal reorganization after visual system disturbances.