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- Simone Bianco, Massimiliano Ignaccolo, Mark S Rider, Mary J Ross, Phil Winsor, Paolo Grigolini
- Physical review. E, Statistical, nonlinear, and…
- 2007

In this paper we show that both music composition and brain function, as revealed by the electroencephalogram (EEG) analysis, are renewal non-Poisson processes living in the nonergodic dominion. To reach this important conclusion we process the data with the minimum spanning tree method, so as to detect significant events, thereby building a sequence of… (More)

- Malgorzata Turalska, Mirko Lukovic, Bruce J West, Paolo Grigolini
- Physical review. E, Statistical, nonlinear, and…
- 2009

We study a fully connected network (cluster) of interacting two-state units as a model of cooperative decision making. Each unit in isolation generates a Poisson process with rate g . We show that when the number of nodes is finite, the decision-making process becomes intermittent. The decision-time distribution density is characterized by inverse power-law… (More)

- Nicola Scafetta, Paolo Grigolini
- Physical review. E, Statistical, nonlinear, and…
- 2002

The methods currently used to determine the scaling exponent of a complex dynamic process described by a time series are based on the numerical evaluation of variance. This means that all of them can be safely applied only to the case where ordinary statistical properties hold true even if strange kinetics are involved. We illustrate a method of statistical… (More)

We study the intermittent fluorescence of a single molecule, jumping from the " light on " to the " light off " state, as a Poisson process modulated by a fluctuating environment. We show that the quasi-periodic and quasi-deterministic environmental fluctuations make the distribution of the times of sojourn in the " light off " state depart from the… (More)

- Paolo Allegrini, Danilo Menicucci, +5 authors Paolo Paradisi
- Physical review. E, Statistical, nonlinear, and…
- 2009

We study the electroencephalogram (EEG) of 30 closed-eye awake subjects with a technique of analysis recently proposed to detect punctual events signaling rapid transitions between different metastable states. After single-EEG-channel event detection, we study global properties of events simultaneously occurring among two or more electrodes termed… (More)

This is an introduction to the special issue titled " Collective behavior and evolutionary games " that is in the making at Chaos, Solitons & Fractals. The term collective behavior covers many different phenomena in nature and society. From bird flocks and fish swarms to social movements and herding effects [1–5], it is the lack of a central planner that… (More)

- Mirko S Mega, Paolo Allegrini, +4 authors Sergio Vinciguerra
- Physical review letters
- 2003

We study the statistical properties of time distribution of seismicity in California by means of a new method of analysis, the diffusion entropy. We find that the distribution of time intervals between a large earthquake (the main shock of a given seismic sequence) and the next one does not obey Poisson statistics, as assumed by the current models. We prove… (More)

- Armen K. Kalashyan, Marco Buiatti, Paolo Grigolini
- 2007

In the ergodic regime, several methods efficiently estimate the temporal scaling of time series characterized by long-range power-law correlations by converting them into diffusion processes. However, in the condition of ergodicity breakdown, the same methods give ambiguous results. We show that in such regime, two different scaling behaviors emerge… (More)

We study time series concerning rare events. The occurrence of a rare event is depicted as a jump of constant intensity always occurring in the same direction, thereby generating an asymmetric diffusion process. We consider the case where the waiting time distribution is an inverse power law with index µ. We focus our attention on µ < 3, and we evaluate the… (More)

- P. Allegrini, V. Benci, P. Grigolini
- 2002

The adoption of the Kolmogorov-Sinai (KS) entropy is becoming a popular research tool among physicists, especially when applied to a dy-namical system fitting the conditions of validity of the Pesin theorem. The study of time series that are a manifestation of system dynamics whose rules are either unknown or too complex for a mathematical treatment, is… (More)