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Journal of Computational Neuroscience

, Volume 33, Issue 1, pp 141–150 | Cite as

Phase precession through acceleration of local theta rhythm: a biophysical model for the interaction between place cells and local inhibitory neurons

  • Luísa Castro
  • Paulo AguiarEmail author
Article

Abstract

Phase precession is one of the most well known examples within the temporal coding hypothesis. Here we present a biophysical spiking model for phase precession in hippocampal CA1 which focuses on the interaction between place cells and local inhibitory interneurons. The model’s functional block is composed of a place cell (PC) connected with a local inhibitory cell (IC) which is modulated by the population theta rhythm. Both cells receive excitatory inputs from the entorhinal cortex (EC). These inputs are both theta modulated and space modulated. The dynamics of the two neuron types are described by integrate-and-fire models with conductance synapses, and the EC inputs are described using non-homogeneous Poisson processes. Phase precession in our model is caused by increased drive to specific PC/IC pairs when the animal is in their place field. The excitation increases the IC’s firing rate, and this modulates the PC’s firing rate such that both cells precess relative to theta. Our model implies that phase coding in place cells may not be independent from rate coding. The absence of restrictive connectivity constraints in this model predicts the generation of phase precession in any network with similar architecture and subject to a clocking rhythm, independently of the involvement in spatial tasks.

Keywords

Phase precession Theta rhythm Spiking model Theta acceleration Local interneurons Hippocampus 

Notes

Acknowledgements

Research funded by the European Regional Development Fund through the programme COMPETE and by the Portuguese Government through the FCT - Fundação para a Ciência e a Tecnologia under the project PEst-C/MAT/UI0144/2011. Luísa Castro was supported by the grant SFRH/BD/46329/2008 from FCT. The authors would like to thank the reviewers for important suggestions.

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  1. 1.Faculdade de Ciências da Universidade do PortoPortoPortugal
  2. 2.Centro de Matemática da Universidade do PortoPortoPortugal

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