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A thalamo-cortical neural mass model for the simulation of brain rhythms during sleep

Journal of Computational Neuroscience volume 37, pages 125–148 (2014)Cite this article

Abstract

Cortico-thalamic interactions are known to play a pivotal role in many brain phenomena, including sleep, attention, memory consolidation and rhythm generation. Hence, simple mathematical models that can simulate the dialogue between the cortex and the thalamus, at a mesoscopic level, have a great cognitive value. In the present work we describe a neural mass model of a cortico-thalamic module, based on neurophysiological mechanisms. The model includes two thalamic populations (a thalamo-cortical relay cell population, TCR, and its related thalamic reticular nucleus, TRN), and a cortical column consisting of four connected populations (pyramidal neurons, excitatory interneurons, inhibitory interneurons with slow and fast kinetics). Moreover, thalamic neurons exhibit two firing modes: bursting and tonic. Finally, cortical synapses among pyramidal neurons incorporate a disfacilitation mechanism following prolonged activity. Simulations show that the model is able to mimic the different patterns of rhythmic activity in cortical and thalamic neurons (beta and alpha waves, spindles, delta waves, K-complexes, slow sleep waves) and their progressive changes from wakefulness to deep sleep, by just acting on modulatory inputs. Moreover, simulations performed by providing short sensory inputs to the TCR show that brain rhythms during sleep preserve the cortex from external perturbations, still allowing a high cortical activity necessary to drive synaptic plasticity and memory consolidation. In perspective, the present model may be used within larger cortico-thalamic networks, to gain a deeper understanding of mechanisms beneath synaptic changes during sleep, to investigate the specific role of brain rhythms, and to explore cortical synchronization achieved via thalamic influences.

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Abbreviations

NMM:

Neural mass model

TCR:

Thalamo-cortical relay

TRN:

Thalamo-reticular nucleus

SWS:

slow wave sleep

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  1. Department of Electrical, Electronic and Information Engineering “Guglielmo Marconi”, University of Bologna, Via Venezia 52, 47521, Cesena, Italy

    F. Cona, M. Lacanna & M. Ursino

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  1. F. Cona
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  2. M. Lacanna
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  3. M. Ursino
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Correspondence to F. Cona.

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Cona, F., Lacanna, M. & Ursino, M. A thalamo-cortical neural mass model for the simulation of brain rhythms during sleep. J Comput Neurosci 37, 125–148 (2014). https://doi.org/10.1007/s10827-013-0493-1

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  • DOI: https://doi.org/10.1007/s10827-013-0493-1

Keywords

  • Neural mass model
  • Thalamus
  • Sleep
  • Burst firing
  • Spindle
  • Slow wave sleep