Dante R. Chialvo

National University of General San Martín

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Sergio A. Cannas

Universidad Nacional de Córdoba

Dietmar Plenz

National Institute of Mental Health

Tiago L. Ribeiro

National Institute of Mental Health

H. Braun

Heidelberg Academy of Sciences and Humanities

José Jalife

Spanish National Centre for Cardiovascular Research

Tomás S. Grigera

Universidad Nacional de La Plata

Halszka Ogińska

Jagiellonian University

Ewa Gudowska–Nowak

Jagiellonian University

Daniel A. Mártin

Consejo Nacional de Investigaciones Científicas y Técnicas

Emiliano Zamponi

Columbia University

Cooperative Institutions

Consejo Nacional de Investigaciones Científicas y Técnicas

National Institute of Mental Health

Jagiellonian University

Instituto de Neurología Cognitiva

Centro Científico Tecnológico - San Juan

Favaloro University

Universidad Nacional de Córdoba

National Institutes of Health

Institute of Physics

University of San Andrés

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GHOST STOCHASTIC RESONANCE IN AN ELECTRONIC CIRCUIT

International Journal of Bifurcation and Chaos (2006)

O. Calvo Dante R. Chialvo

We demonstrate experimentally the regime of ghost stochastic resonance in the response of a Monostable Schmit Trigger electronic circuit driven by noise and signals with N frequency components: kf 0 +Δf, (k+1)f 0 +Δf,…, k+nf 0 +Δf where k is an integer greater than one. It is verified that stochastic resonance occurs at the frequency f r = f 0 + (Δf/(k+(N-1)/2)), as predicted in the theory. At the frequency for which the resonance is maximum there is no input energy, and thus this form is called "ghost" stochastic resonance.

Stochastic Resonance

Multivibrator

RLC circuit

10.1142/s0218127406015106

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Citations (40)

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Citations (37)

Observing changes in human functioning during induced sleep deficiency and recovery periods

PLoS ONE (2021)

Jeremi K. Ochab J. Szwed K. Oleś Anna Bereś Dante R. Chialvo

Prolonged periods of sleep restriction seem to be common in the contemporary world. Sleep loss causes perturbations of circadian rhythmicity and degradation of waking alertness as reflected in attention, cognitive efficiency and memory. Understanding whether and how the human brain recovers from chronic sleep loss is important not only from a scientific but also from a public health perspective. In this work we report on behavioral, motor, and neurophysiological correlates of sleep loss in healthy adults in an unprecedented study conducted in natural conditions and comprising 21 consecutive days divided into periods of 4 days of regular life (a baseline), 10 days of chronic partial sleep restriction (30% reduction relative to individual sleep need) and 7 days of recovery. Throughout the whole experiment we continuously measured the spontaneous locomotor activity by means of actigraphy with 1-minute resolution. On a daily basis the subjects were undergoing EEG measurements (64-electrodes with 500 Hz sampling frequency): resting state with eyes open and closed (8 minutes long each) followed by Stroop task lasting 22 minutes. Altogether we analyzed actigraphy (distributions of rest and activity durations), behavioral measures (reaction times and accuracy from Stroop task) and EEG (amplitudes, latencies and scalp maps of event-related potentials from Stroop task and power spectra from resting states). We observed unanimous deterioration in all the measures during sleep restriction. Further results indicate that a week of recovery subsequent to prolonged periods of sleep restriction is insufficient to recover fully. Only one measure (mean reaction time in Stroop task) reverted to baseline values, while the others did not.

Sleep restriction

Stroop effect

Alertness

Sleep

10.1371/journal.pone.0255771

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Citations (23)

Parabolic avalanche scaling in the synchronization of cortical cell assemblies

Nature Communications (2023)

Elliott L. Capek Tiago L. Ribeiro Patrick Kells Keshav Srinivasan Stephanie R. Miller

Abstract Neurons in the cerebral cortex fire coincident action potentials during ongoing activity and in response to sensory inputs. These synchronized cell assemblies are fundamental to cortex function, yet basic dynamical aspects of their size and duration are largely unknown. Using 2-photon imaging of neurons in the superficial cortex of awake mice, we show that synchronized cell assemblies organize as scale-invariant avalanches that quadratically grow with duration. The quadratic avalanche scaling was only found for correlated neurons, required temporal coarse-graining to compensate for spatial subsampling of the imaged cortex, and suggested cortical dynamics to be critical as demonstrated in simulations of balanced E/I-networks. The corresponding time course of an inverted parabola with exponent of χ = 2 described cortical avalanches of coincident firing for up to 5 s duration over an area of 1 mm 2 . These parabolic avalanches maximized temporal complexity in the ongoing activity of prefrontal and somatosensory cortex and in visual responses of primary visual cortex. Our results identify a scale-invariant temporal order in the synchronization of highly diverse cortical cell assemblies in the form of parabolic avalanches.

Binocular neurons

Parabola

Scale invariance

10.1038/s41467-023-37976-x

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Low dimensional chaos in cardiac tissue

Nature (1990)

Dante R. Chialvo Robert F. Gilmour José Jalife

Aperiodic graph

Purkinje fibers

Cardiac Electrophysiology

Cardiac muscle

10.1038/343653a0

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Citations (232)

Solar forced Dansgaard‐Oeschger events and their phase relation with solar proxies

Geophysical Research Letters (2008)

H. Braun Peter Ditlevsen Dante R. Chialvo

North Atlantic climate during glacial times was characterized by large‐amplitude switchings, the Dansgaard‐Oeschger (DO) events, with an apparent tendency to recur preferably in multiples of about 1470 years. Recent work interpreted these intervals as resulting from a subharmonic response of a highly nonlinear system to quasi‐periodic solar forcing plus noise. This hypothesis was challenged as inconsistent with the observed variability in the phase relation between proxies of solar activity and Greenland climate. Here we reject the claim of inconsistency by showing that this phase variability is a robust, generic feature of the nonlinear dynamics of DO events, as described by a model. This variability is expected from the fact that the events are threshold crossing events, resulting from a cooperative process between the periodic forcing and the noise. This process produces a fluctuating phase relation with the periodic forcing, consistent with proxies of solar activity and Greenland climate.

Forcing (mathematics)

Solar variation

10.1029/2008gl033414

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Citations (27)

Non-linear dynamics of cardiac excitation and impulse propagation

Nature (1987)

Dante R. Chialvo José Jalife

Dynamics

Complex dynamics

Impulse response

10.1038/330749a0

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Citations (169)

Box scaling as a proxy of finite size correlations

Scientific Reports (2021)

Daniel A. Mártin Tiago L. Ribeiro Sergio A. Cannas Tomás S. Grigera Dietmar Plenz

Abstract The scaling of correlations as a function of size provides important hints to understand critical phenomena on a variety of systems. Its study in biological structures offers two challenges: usually they are not of infinite size, and, in the majority of cases, dimensions can not be varied at will. Here we discuss how finite-size scaling can be approximated in an experimental system of fixed and relatively small extent, by computing correlations inside of a reduced field of view of various widths (we will refer to this procedure as “box-scaling”). A relation among the size of the field of view, and measured correlation length, is derived at, and away from, the critical regime. Numerical simulations of a neuronal network, as well as the ferromagnetic 2D Ising model, are used to verify such approximations. Numerical results support the validity of the heuristic approach, which should be useful to characterize relevant aspects of critical phenomena in biological systems.

10.1038/s41598-021-95595-2

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A simple conceptual model to interpret the 100 000 years dynamics of paleo-climate records

Nonlinear processes in geophysics (2010)

C. S. Quiroga Lombard Pablo Balenzuela H. Braun Dante R. Chialvo

Abstract. Spectral analyses performed on records of cosmogenic nuclides reveal a group of dominant spectral components during the Holocene period. Only a few of them are related to known solar cycles, i.e., the De Vries/Suess, Gleissberg and Hallstatt cycles. The origin of the others remains uncertain. On the other hand, time series of North Atlantic atmospheric/sea surface temperatures during the last ice age display the existence of repeated large-scale warming events, called Dansgaard-Oeschger (DO) events, spaced around multiples of 1470 years. The De Vries/Suess and Gleissberg cycles with periods close to 1470/7 (~210) and 1470/17 (~86.5) years have been proposed to explain these observations. In this work we found that a conceptual bistable model forced with the De Vries/Suess and Gleissberg cycles plus noise displays a group of dominant frequencies similar to those obtained in the Fourier spectra from paleo-climate during the Holocene. Moreover, we show that simply changing the noise amplitude in the model we obtain similar power spectra to those corresponding to GISP2 δ18O (Greenland Ice Sheet Project 2) during the last ice age. These results give a general dynamical framework which allows us to interpret the main characteristic of paleoclimate records from the last 100 000 years.

Paleoclimatology

Ice core

Cosmogenic nuclide

10.5194/npg-17-585-2010

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Citations (3)

Scale-Free Fluctuations in Behavioral Performance: Delineating Changes in Spontaneous Behavior of Humans with Induced Sleep Deficiency

PLoS ONE (2014)

Jeremi K. Ochab Jacek Tyburczyk Ewa Beldzik Dante R. Chialvo Aleksandra Domagalik

The timing and dynamics of many diverse behaviors of mammals, e.g., patterns of animal foraging or human communication in social networks exhibit complex self-similar properties reproducible over multiple time scales. In this paper, we analyze spontaneous locomotor activity of healthy individuals recorded in two different conditions: during a week of regular sleep and a week of chronic partial sleep deprivation. After separating activity from rest with a pre-defined activity threshold, we have detected distinct statistical features of duration times of these two states. The cumulative distributions of activity periods follow a stretched exponential shape, and remain similar for both control and sleep deprived individuals. In contrast, rest periods, which follow power-law statistics over two orders of magnitude, have significantly distinct distributions for these two groups and the difference emerges already after the first night of shortened sleep. We have found steeper distributions for sleep deprived individuals, which indicates fewer long rest periods and more turbulent behavior. This separation of power-law exponents is the main result of our investigations, and might constitute an objective measure demonstrating the severity of sleep deprivation and the effects of sleep disorders.

Sleep

Rest (music)

Sleep patterns

10.1371/journal.pone.0107542

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Citations (19)