Synaptic scaling rule preserves excitatory-inhibitory balance and salient neuronal network dynamics.
Nat Neurosci
; 19(12): 1690-1696, 2016 12.
Article
em En
| MEDLINE
| ID: mdl-27749827
ABSTRACT
The balance between excitation and inhibition (E-I balance) is maintained across brain regions though the network size, strength and number of synaptic connections, and connection architecture may vary substantially. We use a culture preparation to examine the homeostatic synaptic scaling rules that produce E-I balance and in vivo-like activity. We show that synaptic strength scales with the number of connections K as â¼ , close to the ideal theoretical value. Using optogenetic techniques, we delivered spatiotemporally patterned stimuli to neurons and confirmed key theoretical predictions E-I balance is maintained, active decorrelation occurs and the spiking correlation increases with firing rate. Moreover, the trial-to-trial response variability decreased during stimulation, as observed in vivo. These results-obtained in generic cultures, predicted by theory and observed in the intact brain-suggest that the synaptic scaling rule and resultant dynamics are emergent properties of networks in general.
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Base de dados:
MEDLINE
Assunto principal:
Sinapses
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Transmissão Sináptica
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Potenciais Pós-Sinápticos Excitadores
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Rede Nervosa
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Plasticidade Neuronal
Limite:
Animals
Idioma:
En
Ano de publicação:
2016
Tipo de documento:
Article