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

By Dietmar Plenz, Ernst Niebur

ISBN-10: 3527411046

ISBN-13: 9783527411047

Leading experts within the box overview present wisdom of severe habit in mind functionality, either experimental and theoretical. The ebook starts through summarizing experimental proof for self-organized criticality within the mind. in this case, contemporary breakthroughs in modeling of neuronal circuits to set up self-organized criticality are defined. eventually, the significance of serious dynamics for mind functionality is highlighted.

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Critical branching predicts that neuronal group size at the beginning of an avalanche is maintained throughout the avalanche, and consequently normalized nLFPs should Avalanche I 1−p p nLFP thr 1 Cascade a n 0 Peak 0 di ai si = Monkey A Monkey B 2 Avg. 2 Cortical Resting Activity Organizes as Neuronal Avalanches distribute around the value of 1 for any time starting from the beginning of the avalanche. 3g,h) [34] and in humans (Shriki and Plenz; see Chapter 8). The relationship is destroyed when changing the balance of excitation and inhibition.

For earthquakes, given the Omori law, it is natural to calculate the average number of aftershocks that follow a main quake of size s until the rate of aftershocks has reached seismic background levels. 8. We found that a similar law predicts the number of after-avalanches the cortex will generate given a main avalanche of minimal size s0 . 05 (n = 13 cortex cultures) [34]. 5D summarizes the essential power law relationships between successive avalanches with respect to inter-avalanche time, avalanche size, and nLFP intensity.

Monkey B averages over all four arrays. Note that mode = 0 indicates a ratio of a(k)/a(0) = 1 equivalent to a critical branching parameter ???? = 1. (h) Corresponding analysis for spontaneous avalanche activity in organotypic slice cultures in vitro. (i) Left: Partial reduction in inhibition using 3–5 μM of picrotoxin (PTX) results in a systematic increase of nLFP area during cascade lifetime deviating from avalanche dynamics. Middle: Corresponding modes in cultures before (control) and during picrotoxin (PTX).

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Criticality in Neural Systems by Dietmar Plenz, Ernst Niebur


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