Influence of external input on waxing and waning of neuronal network oscillations
© Gonzalez et al; licensee BioMed Central Ltd. 2009
Published: 13 July 2009
Experimental observations have reported modulation of cortical oscillations as phases of high synchronization (waxing) followed by periods of reduced synchronization (waning) [1–3]. Although the phenomenon is present in almost all frequency bands, it is still not understood how this is driven. Here we study whether this phenomenon can occur in a network of inhibitory (I) and excitatory (E) cells and what effect external inputs have.
Using NEURON, we model a network of N e excitatory and N i inhibitory cells such that N e /N i = 4. The cells have a single compartment, and include passive channels and voltage dependent Na+, K+ channels. Synaptic connections are random, projecting GABA synapses from I to I and I to E cells and AMPA synapses from E to E and E to I cells. To stimulate the network, each cell receives a baseline of current and a stream of spikes delivered at random intervals across the simulated period.
The work was supported by the EU grant MC-RTN NEURoVERS-it (019247).
- Hughes SW, Loerincz M, Cope DW, Blethyn KL, Kékesi KA, Parri HR, Juhász G, Crunelli V: Synchronized oscillations at α and β frequencies in the lateral geniculate nucleus. Neuron. 2004, 42: 253-268. 10.1016/S0896-6273(04)00191-6.PubMedView ArticleGoogle Scholar
- Palva S, Palva JM: New vistas for a-frequency band oscillations. Trends Neurosci. 2007, 30: 150-158. 10.1016/j.tins.2007.02.001.PubMedView ArticleGoogle Scholar
- Courtemanche R, Lamarre Y: Local field potential oscillations in primate cerebellar cortex: synchronization with cerebral cortex during active and passive expectancy. J Neurophysiol. 2005, 93: 2039-2052. 10.1152/jn.00080.2004.PubMedView ArticleGoogle Scholar
This article is published under license to BioMed Central Ltd.