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Figure 4: Traveling wave pattern of activity in an array of 240 by 240 excitatory neurons and 80 by 80 inhibitory interneurons. Only pattern of activity in excitatory neurons is shown. A rectangular depolarizing current (frequency 7Hz, 0.25 mA) is applied on the input of three neurons in the center of the array for 2 sec per iod at the beginning (first 20 frames). Contrary to a network without inhibition, (Fig. 2) there is no regul ar pattern of ring-like waves. Even during the period of stimulation irregular pattern emerges. Overall acti vity is decreased in comparison with activity in network without inhibition shown in Fig. 2.

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