The overall strength of a connection is represented by a single synaptic weight parameter and a delay parameter represents all delays between cells. We assume that there is no significant inhibition in the network. This can be interpreted either as a dissociated cell culture after applying a blocker of inhibition or cortical tissue where local inhibition is dominated by excitation. A pseudo-random generator was used to choose connections for each cell. This produced a network with no predefined structure of circuits.
All connections have equal strength and delay.
Individual cells and synapses have properties based on physiologic data. The selected cells were stimulated by a depolarizing current for 100 ms at the beginning of the simulation or throughout the whole simulation. The stimulated cells received a input current strong enough to evoke a burst of action potentials. The membrane potentials for selected cells and histograms of generated action potentials for all cells were recorded. The histograms were later used to generate animations of the spread of activity in arrays of neurons.