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Robustness effect of gap junctions between Golgi cells on cerebellar cortex oscillations
Fabio M Simões de Souza1, Erik De Schutter
1Computational Neuroscience Unit, Okinawa Institute of Science and Technology, Okinawa 904-0411, Japan. erik@oist.jp.
Neural Systems & Circuits
|February 15, 2012
Summary
Gap junctions between Golgi cells (GoCs) enhance cerebellar oscillations. These connections strengthen oscillations driven by the Golgi cell-granule cell feedback loop, improving their robustness.
Area of Science:
- Neuroscience
- Computational Neuroscience
- Cerebellar Circuitry
Background:
- Previous 1D models linked cerebellar granular layer activity to cortex oscillations.
- Golgi cell gap junctions' role in oscillations remained unclear.
Purpose of the Study:
- Investigate the impact of Golgi cell gap junctions on granular layer oscillations.
- Model the Golgi cell-granule cell circuit with and without inter-Golgi cell gap junctions.
Main Methods:
- Developed a novel 2D computational model of the Golgi cell-granule cell circuit.
- Simulated circuit behavior with and without gap junctions between Golgi cells.
Main Results:
- Gap junction-coupled isolated Golgi cells oscillated spontaneously.
- In synaptically connected networks, gap junctions increased oscillation power but not frequency.
- Oscillations were primarily driven by the Golgi cell-granule cell synaptic feedback loop.
Conclusions:
- Golgi cell gap junctions enhance the robustness of cerebellar oscillations.
- This robustness effect may be a general mechanism applicable to other brain regions.
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