The role of node dynamics in shaping emergent functional connectivity patterns in the brain

被引:24
|
作者
Forrester, Michael [1 ]
Crofts, Jonathan J. [2 ]
Sotiropoulos, Stamatios N. [3 ,4 ,5 ]
Coombes, Stephen [1 ]
O'Dea, Reuben D. [1 ]
机构
[1] Univ Nottingham, Ctr Math Med & Biol, Sch Math Sci, Nottingham, England
[2] Nottingham Trent Univ, Sch Sci & Technol, Dept Phys & Math, Nottingham, England
[3] Univ Nottingham, Sir Peter Mansfield Imaging Ctr, Queens Med Ctr, Nottingham, England
[4] Univ Oxford, Wellcome Ctr Integrat Neuroimaging WIN FMRIB, Oxford, England
[5] Natl Inst Hlth Res NIHR, Queens Med Ctr, Nottingham Biomed Res Ctr, Nottingham, England
来源
NETWORK NEUROSCIENCE | 2020年 / 4卷 / 02期
基金
英国工程与自然科学研究理事会;
关键词
Structural connectivity; Functional connectivity; Neural mass model; Coupled oscillator theory; Hopf bifurcation; False bifurcation; BIFURCATION-ANALYSIS; NETWORK; SYNCHRONIZATION; MODELS; EEG; ORGANIZATION; CRITICALITY; COHERENCE; MEG;
D O I
10.1162/netn_a_00130
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
The contribution of structural connectivity to functional brain states remains poorly understood. We present a mathematical and computational study suited to assess the structure-function issue, treating a system of Jansen-Rit neural mass nodes with heterogeneous structural connections estimated from diffusion MRI data provided by the Human Connectome Project. Via direct simulations we determine the similarity of functional (inferred from correlated activity between nodes) and structural connectivity matrices under variation of the parameters controlling single-node dynamics, highlighting a nontrivial structure-function relationship in regimes that support limit cycle oscillations. To determine their relationship, we firstly calculate network instabilities giving rise to oscillations, and the so-called 'false bifurcations' (for which a significant qualitative change in the orbit is observed, without a change of stability) occurring beyond this onset. We highlight that functional connectivity (FC) is inherited robustly from structure when node dynamics are poised near a Hopf bifurcation, whilst near false bifurcations, and structure only weakly influences FC. Secondly, we develop a weakly coupled oscillator description to analyse oscillatory phase-locked states and, furthermore, show how the modular structure of FC matrices can be predicted via linear stability analysis. This study thereby emphasises the substantial role that local dynamics can have in shaping large-scale functional brain states. Author SummaryPatterns of oscillation across the brain arise because of structural connections between brain regions. However, the type of oscillation at a site may also play a contributory role. We focus on an idealised model of a neural mass network, coupled using estimates of structural connections obtained via tractography on Human Connectome Project MRI data. Using a mixture of computational and mathematical techniques, we show that functional connectivity is inherited most strongly from structural connectivity when the network nodes are poised at a Hopf bifurcation. However, beyond the onset of this oscillatory instability a phase-locked network state can undergo a false bifurcation, and structural connectivity only weakly influences functional connectivity. This highlights the important effect that local dynamics can have on large-scale brain states.
引用
收藏
页码:467 / 483
页数:17
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