Abstract
Large-scale dissociated in vitro cortical networks spontaneously exhibit recurrent events of propagating spiking and bursting activity, usually termed as neuronal avalanches, since their size and lifetime distributions can be described by a power law, as in critical sand pile models. Indeed, this spontaneous activity is originated by the synaptic interactions among neurons which are able to freely re-create networks exhibiting complex topological structures. However, experimental in vitro findings show that mature cortical assemblies not necessarily display a critical dynamics, but can follow two other different dynamic states, namely sub-critical and super-critical. Well-known factors that drive the network to these different states are the developmental stage and the excitation/inhibition balance. In this chapter, we will investigate the interplay between self-organized critical state and topological features of the underling cortical network. To investigate the role of connectivity in driving spontaneous activity towards critical, sub-critical or super-critical regimes, results achieved by combining both experimental and computational investigations will be presented and discussed.
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Notes
- 1.
The IEI is the probability density of time intervals between successive spikes of all the neurons. The average value of the IEI distribution gives an indication of the average time between two successive activations of any pair of neurons. Generally, the average IEI is calculated by averaging the values of the IEI distribution over a predefined time interval whose maximum value is determined as the average time interval corresponding to more the 99% of the area of the mean cross-correlogram (averaging cross-correlograms between all possible pairs of neurons).
- 2.
The coincidence index is defined as the ratio of the integral of the cross-correlation function in a specified area (e.g., ±1 ms) around the zero bin to the integral of the total area [6].
- 3.
Kruskal–Wallis non-parametric test was applied since the normality assumption was not verified by the considered dataset (Kolmogorov-Smirnov normality test).
- 4.
The Small-World Index (SWI) is defined as: \( SWI = \frac{{CC_{net} }}{{CC_{rnd} }}/\frac{{PL_{net} }}{{PL_{rnd} }} \), where CCnet and PLnet are the cluster coefficient and the path length of the investigated network; while CCrnd and PLrnd correspond to the cluster coefficient and the path length of random networks equivalent to the original network (i.e., with the same number of nodes and links). A SWI higher than 1 suggests the emergence of a small-world topology.
- 5.
It is used to measure the distance between the empirical distribution and the fitted model. When the p-value is close to 1, the data set is considered to be drawn from the fitted distribution, otherwise it should be rejected.
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Massobrio, P., Pasquale, V. (2019). Complexity of Network Connectivity Promotes Self-organized Criticality in Cortical Ensembles. In: Tomen, N., Herrmann, J., Ernst, U. (eds) The Functional Role of Critical Dynamics in Neural Systems . Springer Series on Bio- and Neurosystems, vol 11. Springer, Cham. https://doi.org/10.1007/978-3-030-20965-0_3
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