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On the linear scaling of entropy vs. energy in human brain activity, the Hagedorn temperature and the Zipf law
Dante R. Chialvo, Romuald A. Janik
It is well established that the brain spontaneously traverses through a very large number of states. Nevertheless, despite its relevance to understanding brain function, a formal d…
Self Tuned Criticality: Controlling a neuron near its bifurcation point via temporal correlations
Juliane T. Moraes, Eyisto J. Aguilar Trejo, Sabrina Camargo +2
Previous work showed that the collective activity of large neuronal networks can be tamed to remain near its critical point by a feedback control that maximizes the temporal correl…
Scale-free correlations in the dynamics of a small (N ~ 10000) cortical network
Sabrina Camargo, Daniel A. Martin, Eyisto J. Aguilar Trejo +5
The advent of novel opto-genetics technology allows the recording of brain activity with a resolution never seen before. The characterisation of these very large data sets offers n…
Untangling the brain web: from the early days of complex functional networks to the non-linear dynamical directed functional connectivity measures
Dante R. Chialvo, Ignacio Cifre, Jeremi K. Ochab
Already two decades passed since the first applications of graph theory to brain neuroimaging. Since that early description, the characterization of the brain as a very large inter…
Revisiting non-linear functional brain co-activations: directed, dynamic and delayed
Ignacio Cifre, Maria T. Miller Flores, Jeremi K. Ochab +1
The center stage of neuro-imaging is currently occupied by studies of functional correlations between brain regions. These correlations define the brain functional networks, which…
From synaptic interactions to collective dynamics in random neuronal networks models: critical role of eigenvectors and transient behavior
Ewa Gudowska-Nowak, Maciej A. Nowak, Dante R. Chialvo +2
The study of neuronal interactions is currently at the center of several big collaborative neuroscience projects (including the Human Connectome Project, the Blue Brain Project, th…
On the pros and cons of using temporal derivatives to assess brain functional connectivity
Jeremi K. Ochab, Wojciech Tarnowski, and Maciej A. Nowak +1
The study of correlations between brain regions is an important chapter of the analysis of large-scale brain spatiotemporal dynamics. In particular, novel methods suited to extract…
On why a few points suffice to describe spatiotemporal large-scale brain dynamics
Ignacio Cifre, Mahdi Zarepour, Silvina G Horovitz +2
An heuristic signal processing scheme recently introduced shows how brain signals can be efficiently represented by a sparse spatiotemporal point process. The approach has been val…
Large-scale signatures of unconsciousness are consistent with a departure from critical dynamics
Enzo Tagliazucchi, Dante R. Chialvo, Michael Siniatchkin +5
Loss of cortical integration and changes in the dynamics of electrophysiological brain signals characterize the transition from wakefulness towards unconsciousness. The common mech…
How we move is universal: scaling in the average shape of human activity
Dante R. Chialvo, Ana Maria Gonzalez Torrado, Ewa Gudowska-Nowak +4
Human motor activity is constrained by the rhythmicity of the 24 hours circadian cycle, including the usual 12-15 hours sleep-wake cycle. However, activity fluctuations also appear…
A few points suffice: Efficient large-scale computation of brain voxel-wise functional connectomes from a sparse spatio-temporal point-process
Enzo Tagliazucchi, Helmut Laufs, Dante R. Chialvo
Large efforts are currently under way to systematically map functional connectivity between all pairs of millimeter-scale brain regions using big volumes of neuroimaging data. Func…
Enhanced repertoire of brain dynamical states during the psychedelic experience
Enzo Tagliazucchi, Robin Carhart-Harris, Robert Leech +2
The study of rapid changes in brain dynamics and functional connectivity (FC) is of increasing interest in neuroimaging. Brain states departing from normal waking consciousness are…
Point-process deconvolution of fMRI reveals effective connectivity alterations in chronic pain patients
Guorong Wu, Enzo Tagliazucchi, Dante R. Chialvo +1
It is now recognized that important information can be extracted from the brain spontaneous activity, as exposed by recent analysis using a repertoire of computational methods. In…
Disruption of transfer entropy and inter-hemispheric brain functional connectivity in patients with disorder of consciousness
Verónica Mäki-Marttunen, Ibai Diez, Jesus M. Cortes +2
Severe traumatic brain injury can lead to disorders of consciousness (DOC) characterized by deficit in conscious awareness and cognitive impairment including coma, vegetative state…
Brain complexity born out of criticality
Enzo Tagliazucchi, Dante R. Chialvo
In this essay we elaborate on recent evidence demonstrating the presence of a second order phase transition in human brain dynamics and discuss its consequences for theoretical app…
Critical brain dynamics at large scale
Dante R. Chialvo
Highly correlated brain dynamics produces synchronized states with no behavioral value, while weakly correlated dynamics prevent information flow. In between these states, the uniq…
Brain organization into resting state networks emerges at criticality on a model of the human connectome
Ariel Haimovici, Enzo Tagliazucchi, Pablo Balenzuela +1
The relation between large-scale brain structure and function is an outstanding open problem in neuroscience. We approach this problem by studying the dynamical regime under which…
Point process analysis of large-scale brain fMRI dynamics
Enzo Tagliazucchi, Pablo Balenzuela, Daniel Fraiman +1
Functional magnetic resonance imaging (fMRI) techniques have contributed significantly to our understanding of brain function. Current methods are based on the analysis of \emph{gr…
The collective brain is critical
Enzo Tagliazucchi, Dante R. Chialvo
The unique dynamical features of the critical state endow the brain with properties which are fundamental for adaptive behavior. This proposal, put forward with Per Bak several yea…
Spike Avalanches Exhibit Universal Dynamics across the Sleep-Wake Cycle
Tiago L. Ribeiro, Mauro Copelli, Fábio Caixeta +4
Scale-invariant neuronal avalanches have been observed in cell cultures and slices as well as anesthetized and awake brains, suggesting that the brain operates near criticality, i.…
What kind of noise is brain noise: anomalous scaling behavior of the resting brain activity fluctuations
Dante R. Chialvo, Daniel Fraiman
The continuous interaction between brain regions "at rest" defines the so-called resting state networks (RSN) which can be reconstructed from the analysis of functional magnetic re…
Emergent complex neural dynamics
Dante R. Chialvo
A large repertoire of spatiotemporal activity patterns in the brain is the basis for adaptive behaviour. Understanding the mechanism by which the brain's hundred billion neurons an…
Self-similar correlation function in brain resting-state fMRI
Paul Expert, Renaud Lambiotte, Dante R. Chialvo +4
Adaptive behavior, cognition and emotion are the result of a bewildering variety of brain spatiotemporal activity patterns. An important problem in neuroscience is to understand th…
Scaling properties of neuronal avalanches are consistent with critical dynamics
Dietmar Plenz, Dante R. Chialvo
Complex systems, when poised near a critical point of a phase transition between order and disorder, exhibit a dynamics comprising a scale-free mixture of order and disorder which…