Before revision:  By examining the  increase of synaptic strengths and number of modules we find that the network behavior changes following different mechanisms: (1 ) increase of autocorrelations among individual neurons, and ( 2 ) increase of cross-correlations among pairs of neurons , respectively.
After revision:  By examining the network behavior under increase of synaptic strengths and number of modules we find that the network behavior changes following different mechanisms: (1 ) increase of autocorrelations among individual neurons, and ( 2 ) increase of cross-correlations among pairs of neurons , respectively.