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Characteristic of a WS small-world network for the number of nearest neighbor of each node k. The number of nearest neighbor of each node k are set as a 2, b 4, c 8. If two neurons i, j are connected, 
, otherwise, 
. Other system parameters are: 
, 
, 
and 
. The time length is 1,000 mS and the neuron number is 1,000
