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- Giacomo Raffaelli, Chiara Saviane, Majid H Mohajerani, Paola Pedarzani, Enrico Cherubini
- The Journal of physiology
- 2004

Large conductance calcium- and voltage-activated potassium channels (BK channels) activate in response to calcium influx during action potentials and contribute to the spike repolarization and fast afterhyperpolarization. BK channels targeted to active zones in presynaptic nerve terminals have been shown to limit calcium entry and transmitter release by… (More)

- Chiara Saviane, Leonid P Savtchenko, Giacomo Raffaelli, Leon L Voronin, Enrico Cherubini
- The Journal of physiology
- 2002

Paired recordings between CA3 interconnected pyramidal neurons were used to study the properties of short-term depression occurring in these synapses under different frequencies of presynaptic firing (n = 22). In stationary conditions (0.05-0.067 Hz) pairs of presynaptic action potentials (50 ms apart) evoked EPSCs whose amplitude fluctuated from trial to… (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, P Grigolini, P Hamilton, L Palatella, G Raffaelli
- Physical review. E, Statistical, nonlinear, and…
- 2002

We describe two types of memory and illustrate each using artificial and actual heartbeat data sets. The first type of memory, yielding anomalous diffusion, implies the inverse power-law nature of the waiting time distribution and the second the correlation among distinct times, and consequently also the occurrence of many pseudoevents, namely, not… (More)

- P Allegrini, R Balocchi, +5 authors G Raffaelli
- Physical review. E, Statistical, nonlinear, and…
- 2003

We analyze RR heartbeat sequences with a dynamic model that satisfactorily reproduces both the long- and the short-time statistical properties of heart beating. These properties are expressed quantitatively by means of two significant parameters, the scaling delta concerning the asymptotic effects of long-range correlation, and the quantity 1-pi… (More)

- Giacomo Raffaelli, Matteo Marsili
- Physical review. E, Statistical, nonlinear, and…
- 2005

The statistical properties of pairwise majority voting over S alternatives are analyzed in an infinite random population. We first compute the probability that the majority is transitive (i.e., that if it prefers A to B to C , then it prefers A to C) and then study the case of an interacting population. This is described by a constrained multicomponent… (More)

We study the long-range correlations of heartbeat fluctuations with the method of diffusion entropy. We show that this method of analysis yields a scaling parameter δ that apparently conflicts with the direct evaluation of the distribution of times of sojourn in states with a given heartbeat frequency. The strength of the memory responsible for this… (More)

We analize heartbeat time-series corresponding to several groups of individuals (healthy, heart transplanted, with congestive heart failure (CHF), after myocardial infarction (MI), hypertensive), looking for short-and long-time statistical behaviors. In particular we study the persistency patterns of interbeat times and interbeat-time variations. Long-range… (More)

- P. Allegrini, R. Balocchi, +5 authors G. Raffaelli
- 2002

Using a method of entropic analysis of time series we establish the correlation between heartbeat long-range memory and mortality risk in patients with

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