Download Criticality in Neural Systems by Dietmar Plenz, Ernst Niebur PDF

By Dietmar Plenz, Ernst Niebur

Leading professionals within the box evaluate present wisdom of serious habit in mind functionality, either experimental and theoretical. The e-book starts off through summarizing experimental proof for self-organized criticality within the mind. as a consequence, fresh breakthroughs in modeling of neuronal circuits to set up self-organized criticality are defined. ultimately, the significance of serious dynamics for mind functionality is highlighted.

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This branching model is rather simple because all ancestors/descendants behave the same. There is no overlap in descendants/ancestors between generations, and the parameters k and p are stationary. Yet, it captures cascade formation in the brain surprisingly well. In a recursion to the topic on criticality outlined in the introduction, if ???? = 1, the population of events from generation to generation, on average, does not grow nor does it shrink. While many cascades will be short (there is after all a significant probability to not have descendants), some cascades will be long and some even longer.

F) nLFPs on the microelectrode array are clustered into periods of high activity separated by periods of relative quiescence (top), an organization that repeats at higher temporal resolutions (middle and bottom). (g) Sketch of five electrodes for the definition of neuronal cascades. A neuronal cascade arises from the concatenation of successive time bins of width Δt that contain at least one nLFP. The size of a cascade can be expressed in various forms. For example, here the cascade has a size of n = 5 electrodes, analog to ‘‘area,’’ and 100 μV, based on the summation of nLFP peak amplitudes (numbers).

3 (D) >10 μV <1000 ms >1 μV <10 000 ms Note that foreshock and aftershock PDFs are symmetrical until the trigger size falls outside the power law regime of avalanche sizes (‘‘broken line’’; inset). For that size, the foreshock, but not aftershock probability is drastically reduced (broken line). (C) Omori and inverse Omori sequences for neuronal avalanches in the ongoing activity of an awake macaque monkey (monkey A from [74]). In contrast to the peristimulus time histogram, which considers all shocks within a fixed period after a main shock of size s0 , Omori sequences are calculated by considering aftershocks up to the next main shock of size s0 or foreshocks since the last main shock of size s0 .

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