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 increase of synaptic strengths and number of modules we find that these increases are associated with two different effects: (i ) increase of autocorrelations among individual neurons, and ( 2 ) increase of cross-correlations among pairs of neurons , respectively.