PUMA
Istituto di Scienza e Tecnologie dell'Informazione     
Paradisi P., Allegrini P., Gemignani A., Laurino M., Menicucci D., Piarulli A. Scaling and intermittency of brain events as a manifestation of consciousness. In: Physics, Computation, and the Mind - Advances And Challenges At Interfaces. 12th Granada Seminar on Computational and Statistical Physics (La Herradura, Spain, 17–21 September 2012). Proceedings, vol. 1510 pp. 151 - 161. Pedro L. Garrido, Joaquín Marro, Joaquín J. Torres, J. M. Cortés. (AIP Conference Proceedings, vol. 1510). American Institute of Physics, 2013.
 
 
Abstract
(English)
We discuss the critical brain hypothesis and its relationship with intermittent renewal processes displaying power-law decay in the distribution of waiting times between two consecutive renewal events. In particular, studies on complex systems in a "critical" condition show that macro- scopic variables, integrating the activities of many individual functional units, undergo fluctuations with an intermittent serial structure characterized by avalanches with inverse-power-law (scale-free) distribution densities of sizes and inter-event times. This condition, which is denoted as "fractal in- termittency", was found in the electroencephalograms of subjects observed during a resting state wake condition. It remained unsolved whether fractal intermittency correlates with the stream of consciousness or with a non-task-driven default mode activity, also present in non-conscious states, like deep sleep. After reviewing a method of scaling analysis of intermittent systems based of event- driven random walks, we show that during deep sleep fractal intermittency breaks down, and re- establishes during REM (Rapid Eye Movement) sleep, with essentially the same anomalous scaling of the pre-sleep wake condition. From the comparison of the pre-sleep wake, deep sleep and REM conditions we argue that the scaling features of intermittent brain events are related to the level of consciousness and, consequently, could be exploited as a possible indicator of consciousness in clinical applications.
URL: http://scitation.aip.org/content/aip/proceeding/aipcp/10.1063/1.4776519
DOI: 10.1063/1.4776519
Subject Neuro-physiology
Fractal intermittency
Renewal point processes
Diffusion scaling
Time series analysis
Signal processing
I.5.4 PATTERN RECOGNITION. Applications
I.4.6 IMAGE PROCESSING AND COMPUTER VISION. Segmentation
G.3 PROBABILITY AND STATISTICS
J.3 LIFE AND MEDICAL SCIENCES
47N30
60-xx
92Cxx
92Bxx
62-xx
46N55


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