Short-term Synaptic Depression Improves Error-correcting Ability in Cortical Circuits

Details Short-term Synaptic Depression Improves Error-correcting Ability in Cortical Circuits Short-term Synaptic Depression Improves Error-correcting Ability in Cortical Circuits

2005-05-31

arxiv.org/abs/cond-mat/0505749v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

33pages, 10figures

Scientific paper

Synaptic connections are known to change dynamically. High-frequency presynaptic inputs induce decrease of synaptic weights. This process is known as short-term synaptic depression. The synaptic depression controls a gain for presynaptic inputs. However, it remains a controversial issue what are functional roles of this gain control. We propose a new hypothesis that one of the functional roles is to enlarge basins of attraction. To verify this hypothesis, we employ a binary discrete-time associative memory model which consists of excitatory and inhibitory neurons. It is known that the excitatory-inhibitory balance controls an overall activity of the network. The synaptic depression might incorporate an activity control mechanism. Using a mean-field theory and computer simulations, we find that the basins of attraction are enlarged whereas the storage capacity does not change. Furthermore, the excitatory-inhibitory balance and the synaptic depression work cooperatively. This result suggests that the synaptic depression works to improve an error-correcting ability in cortical circuits.

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