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Published on: August 2, 2019
Induction of high-frequency oscillations in a junction-coupled network
Shin-Hua Tseng1, Li-Yun Tsai, Shih-Rung Yeh
1Institute of Molecular Medicine, National Tsing Hua University, Hsinchu 30013, Taiwan.
Summary
High-frequency neural oscillations in animals are generated by electrical synapses. Paired spikes with short intervals trigger these oscillations, a finding verified in crayfish.
Area of Science:
- Neuroscience
- Computational Neuroscience
- Electrophysiology
Background:
- Rhythmic neural oscillations up to 600 Hz are common in animal brains.
- These oscillations persist in calcium-free conditions and are sensitive to gap junction blockers, suggesting electrical synapse involvement.
- Existing mathematical models propose electrical synapse-mediated oscillations, but lack experimental validation in vivo.
Purpose of the Study:
- To investigate the generation mechanism of high-frequency neural oscillations.
- To experimentally verify theoretical models of electrical synapse-mediated oscillations.
- To identify the role of spike intervals and propagation dynamics in oscillation induction.
Main Methods:
- Induction of oscillations using paired spikes with short spike intervals (SIs) in a junction-coupled network.
- Analysis of spike propagation speed and transmission failure across low-conductance junctions.
- Computer simulations and electrophysiological recordings in crayfish tail-flip escape networks.
Main Results:
- Oscillations up to 686 Hz were induced by paired spikes with short SIs, requiring the second spike during the relative refractory period.
- Asymmetrical transjunctional spikes and subsequent spike collision were observed due to varying SIs during propagation.
- A single reverberating spike at the spike initiation site acted as the oscillator center.
Conclusions:
- Paired spikes with specific intervals can directly induce high-frequency oscillations in electrical synapse networks.
- Spike collision dynamics resulting from propagation variations are crucial for oscillation generation.
- This study provides the first experimental validation of electrical synapse-mediated oscillations in an animal model.
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