Comput. Biol. Med. - Fractal-like correlations of the fluctuating inter-spike membrane potential of a Helix aspersa pacemaker neuron.

Tópicos

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Resumo

We analyzed the voltage fluctuations of the membrane potential manifested along the inter-spike segment of a pacemaker neuron. Time series of intracellular inter-spike voltage fluctuations were obtained in the current-clamp configuration from the F1 neuron of 12 Helix aspersa specimens. To assess the dynamic or stochastic nature of the voltage fluctuations these series were analyzed by Detrended Fluctuation Analysis (DFA), providing the scaling exponent a. The median a result obtained for the inter-spike segments was 0.971 ([0.963, 0.995] lower and upper quartiles). Our results indicate a critical-like dynamic behavior in the inter-spike membrane potential that, far from being random, shows long-term correlations probably linked to the dynamics of the mechanisms involved in the regulation of the membrane potential, thereby endorsing the occurrence of critical-like phenomena at a single-neuron level.

Resumo Limpo

analyz voltag fluctuat membran potenti manifest along interspik segment pacemak neuron time seri intracellular interspik voltag fluctuat obtain currentclamp configur f neuron helix aspersa specimen assess dynam stochast natur voltag fluctuat seri analyz detrend fluctuat analysi dfa provid scale expon median result obtain interspik segment lower upper quartil result indic criticallik dynam behavior interspik membran potenti far random show longterm correl probabl link dynam mechan involv regul membran potenti therebi endors occurr criticallik phenomena singleneuron level

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