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The critical value 
for repetitive activity in a AHH model neural network, as a function of the probability of excitatory synaptic connections 
. The mean 
(thick black) over 
simulations, 
1 (solid black) and 2 (thin black) SEM (standard error of the mean, standard deviation of 
) are shown. Single cell critical values of 
(
and 
) are identified (see text for description). 
in units of 
.
