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2017 ; 7
(ä): 44006
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Autaptic Connections Shift Network Excitability and Bursting
#MMPMID28266594
Wiles L
; Gu S
; Pasqualetti F
; Parvesse B
; Gabrieli D
; Bassett DS
; Meaney DF
Sci Rep
2017[Mar]; 7
(ä): 44006
PMID28266594
show ga
We examine the role of structural autapses, when a neuron synapses onto itself,
in driving network-wide bursting behavior. Using a simple spiking model of
neuronal activity, we study how autaptic connections affect activity patterns,
and evaluate if controllability significantly affects changes in bursting from
autaptic connections. Adding more autaptic connections to excitatory neurons
increased the number of spiking events and the number of network-wide bursts. We
observed excitatory synapses contributed more to bursting behavior than
inhibitory synapses. We evaluated if neurons with high average controllability,
predicted to push the network into easily achievable states, affected bursting
behavior differently than neurons with high modal controllability, thought to
influence the network into difficult to reach states. Results show autaptic
connections to excitatory neurons with high average controllability led to higher
burst frequencies than adding the same number of self-looping connections to
neurons with high modal controllability. The number of autapses required to
induce bursting was lowered by adding autapses to high degree excitatory neurons.
These results suggest a role of autaptic connections in controlling network-wide
bursts in diverse cortical and subcortical regions of mammalian brain. Moreover,
they open up new avenues for the study of dynamic neurophysiological correlates
of structural controllability.