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Pàgina inicial > Articles > Articles publicats > Firing rate equations require a spike synchrony mechanism to correctly describe fast oscillations in inhibitory networks |
Data: | 2017 |
Resum: | Recurrently coupled networks of inhibitory neurons robustly generate oscillations in the gamma band. Nonetheless, the corresponding Wilson-Cowan type firing rate equation for such an inhibitory population does not generate such oscillations without an explicit time delay. We show that this discrepancy is due to a voltage-dependent spike-synchronization mechanism inherent in networks of spiking neurons which is not captured by standard firing rate equations. Here we investigate an exact low-dimensional description for a network of heterogeneous canonical Class 1 inhibitory neurons which includes the sub-threshold dynamics crucial for generating synchronous states. In the limit of slow synaptic kinetics the spike-synchrony mechanism is suppressed and the standard Wilson-Cowan equations are formally recovered as long as external inputs are also slow. However, even in this limit synchronous spiking can be elicited by inputs which fluctuate on a time-scale of the membrane time-constant of the neurons. Our meanfield equations therefore represent an extension of the standard Wilson-Cowan equations in which spike synchrony is also correctly described. |
Ajuts: | European Commission 642563 Ministerio de Economía y Competitividad PSI2016-75688-P Ministerio de Economía y Competitividad BFU2012-33413 Ministerio de Economía y Competitividad PCIN-2015-127 Ministerio de Economía y Competitividad MTM2015-71509 |
Drets: | Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió publicada |
Publicat a: | PLoS computational biology, Vol. 13, Issue 12 (December 2017) , art. e1005881, ISSN 1553-7358 |
21 p, 2.3 MB |