Role of membrane potential fluctuations to the criticality of neuronal avalanche activity

Juanico, Dr Dranreb Earl (2007) Role of membrane potential fluctuations to the criticality of neuronal avalanche activity. [Preprint]

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Experimental evidence for self-organised criticality (SOC) in non-conservative systems has recently been found in studies of rat cortical slices. The size distribution of observed neuronal avalanches has been attested to obey $3/2$ power-law scaling. A mean-field sandpile model of a noisy neuronal system is proposed to refute the irreconcilability between non-conservation and criticality put forward by longstanding SOC hypotheses. The model predicts that neuronal networks achieve and maintain criticality despite non-conservation due to the presence of background activity originating from membrane potential fluctuations within individual neurons. Furthermore, small networks are demonstrated to tip towards epileptiform activity when background activity is strong. This finding ties in redundancy, an intriguing feature of brain networks, to robustness of SOC behaviour.

Item Type:Preprint
Keywords:self-organized criticality, neuronal avalanche, background activity, membrane potential fluctuation
Subjects:Neuroscience > Biophysics
Neuroscience > Neural Modelling
ID Code:5501
Deposited By: Juanico, Dr Dranreb Earl
Deposited On:26 Apr 2007
Last Modified:11 Mar 2011 08:56

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