a = 2 kr = 0.95 kf = 0.15 alpha = 4 epsilon = 0.02

and

sigmoid func: .5*(1+tanh(.5*x))

The reference material is [Elimination of spiral waves in a locally connected chaotic neural network by a dynamic phase space constraint] discovered by Yang Li The University of Tokyo, Makito Oku The University of Tokyo, Guoguang He Zhejiang University