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Activity rates of the excitatory components of 4 Memory Units. To give a clear distinction, different colors are used for different Memory Units, and also the values of their activity rates are modified as E(t);E(t)+5;E(t)+10;E(t)+15 respectively. Parameter values are given by: (a)N=4;K0=20;w1=0.1;w2=0. (b)N=4;K0=20;w1=0;w2=0.02.
